| /* libFLAC - Free Lossless Audio Codec library |
| * Copyright (C) 2000,2001 Josh Coalson |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> /* for malloc() */ |
| #include <string.h> /* for memcpy() */ |
| #include "FLAC/assert.h" |
| #include "FLAC/seek_table.h" |
| #include "protected/stream_encoder.h" |
| #include "private/bitbuffer.h" |
| #include "private/bitmath.h" |
| #include "private/crc.h" |
| #include "private/cpu.h" |
| #include "private/stream_encoder_framing.h" |
| #include "private/fixed.h" |
| #include "private/lpc.h" |
| #include "private/md5.h" |
| #include "private/memory.h" |
| |
| #ifdef min |
| #undef min |
| #endif |
| #define min(x,y) ((x)<(y)?(x):(y)) |
| |
| #ifdef max |
| #undef max |
| #endif |
| #define max(x,y) ((x)>(y)?(x):(y)) |
| |
| /*********************************************************************** |
| * |
| * Private class method prototypes |
| * |
| ***********************************************************************/ |
| |
| static bool stream_encoder_resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size); |
| static bool stream_encoder_process_frame_(FLAC__StreamEncoder *encoder, bool is_last_frame); |
| static bool stream_encoder_process_subframes_(FLAC__StreamEncoder *encoder, bool is_last_frame); |
| static bool stream_encoder_process_subframe_(FLAC__StreamEncoder *encoder, unsigned min_partition_order, unsigned max_partition_order, bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const int32 integer_signal[], const real real_signal[], FLAC__Subframe *subframe[2], int32 *residual[2], unsigned *best_subframe, unsigned *best_bits); |
| static bool stream_encoder_add_subframe_(FLAC__StreamEncoder *encoder, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame); |
| static unsigned stream_encoder_evaluate_constant_subframe_(const int32 signal, unsigned subframe_bps, FLAC__Subframe *subframe); |
| static unsigned stream_encoder_evaluate_fixed_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe); |
| static unsigned stream_encoder_evaluate_lpc_subframe_(FLAC__StreamEncoder *encoder, const int32 signal[], int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], const real lp_coeff[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned qlp_coeff_precision, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe); |
| static unsigned stream_encoder_evaluate_verbatim_subframe_(const int32 signal[], unsigned blocksize, unsigned subframe_bps, FLAC__Subframe *subframe); |
| static unsigned stream_encoder_find_best_partition_order_(const int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, unsigned rice_parameter_search_dist, unsigned *best_partition_order, unsigned best_parameters[], unsigned best_raw_bits[]); |
| #if (defined FLAC__PRECOMPUTE_PARTITION_SUMS) || (defined FLAC__SEARCH_FOR_ESCAPES) |
| static unsigned stream_encoder_precompute_partition_info_(const int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order); |
| #endif |
| static bool stream_encoder_set_partitioned_rice_(const uint32 abs_residual[], const uint32 abs_residual_partition_sums[], const unsigned raw_bits_per_partition[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, unsigned parameters[], unsigned raw_bits[], unsigned *bits); |
| static unsigned stream_encoder_get_wasted_bits_(int32 signal[], unsigned samples); |
| |
| /*********************************************************************** |
| * |
| * Private class data |
| * |
| ***********************************************************************/ |
| |
| typedef struct FLAC__StreamEncoderPrivate { |
| unsigned input_capacity; /* current size (in samples) of the signal and residual buffers */ |
| int32 *integer_signal[FLAC__MAX_CHANNELS]; /* the integer version of the input signal */ |
| int32 *integer_signal_mid_side[2]; /* the integer version of the mid-side input signal (stereo only) */ |
| real *real_signal[FLAC__MAX_CHANNELS]; /* the floating-point version of the input signal */ |
| real *real_signal_mid_side[2]; /* the floating-point version of the mid-side input signal (stereo only) */ |
| unsigned subframe_bps[FLAC__MAX_CHANNELS]; /* the effective bits per sample of the input signal (stream bps - wasted bits) */ |
| unsigned subframe_bps_mid_side[2]; /* the effective bits per sample of the mid-side input signal (stream bps - wasted bits + 0/1) */ |
| int32 *residual_workspace[FLAC__MAX_CHANNELS][2]; /* each channel has a candidate and best workspace where the subframe residual signals will be stored */ |
| int32 *residual_workspace_mid_side[2][2]; |
| FLAC__Subframe subframe_workspace[FLAC__MAX_CHANNELS][2]; |
| FLAC__Subframe subframe_workspace_mid_side[2][2]; |
| FLAC__Subframe *subframe_workspace_ptr[FLAC__MAX_CHANNELS][2]; |
| FLAC__Subframe *subframe_workspace_ptr_mid_side[2][2]; |
| unsigned best_subframe[FLAC__MAX_CHANNELS]; /* index into the above workspaces */ |
| unsigned best_subframe_mid_side[2]; |
| unsigned best_subframe_bits[FLAC__MAX_CHANNELS]; /* size in bits of the best subframe for each channel */ |
| unsigned best_subframe_bits_mid_side[2]; |
| uint32 *abs_residual; /* workspace where abs(candidate residual) is stored */ |
| uint32 *abs_residual_partition_sums; /* workspace where the sum of abs(candidate residual) for each partition is stored */ |
| unsigned *raw_bits_per_partition; /* workspace where the sum of silog2(candidate residual) for each partition is stored */ |
| FLAC__BitBuffer frame; /* the current frame being worked on */ |
| double loose_mid_side_stereo_frames_exact; /* exact number of frames the encoder will use before trying both independent and mid/side frames again */ |
| unsigned loose_mid_side_stereo_frames; /* rounded number of frames the encoder will use before trying both independent and mid/side frames again */ |
| unsigned loose_mid_side_stereo_frame_count; /* number of frames using the current channel assignment */ |
| FLAC__ChannelAssignment last_channel_assignment; |
| FLAC__StreamMetaData metadata; |
| unsigned current_sample_number; |
| unsigned current_frame_number; |
| struct MD5Context md5context; |
| FLAC__CPUInfo cpuinfo; |
| unsigned (*local_fixed_compute_best_predictor)(const int32 data[], unsigned data_len, real residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]); |
| void (*local_lpc_compute_autocorrelation)(const real data[], unsigned data_len, unsigned lag, real autoc[]); |
| void (*local_lpc_compute_residual_from_qlp_coefficients)(const int32 data[], unsigned data_len, const int32 qlp_coeff[], unsigned order, int lp_quantization, int32 residual[]); |
| void (*local_lpc_compute_residual_from_qlp_coefficients_16bit)(const int32 data[], unsigned data_len, const int32 qlp_coeff[], unsigned order, int lp_quantization, int32 residual[]); |
| bool use_slow; /* use slow 64-bit versions of some functions */ |
| FLAC__StreamEncoderWriteStatus (*write_callback)(const FLAC__StreamEncoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data); |
| void (*metadata_callback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data); |
| void *client_data; |
| /* unaligned (original) pointers to allocated data */ |
| int32 *integer_signal_unaligned[FLAC__MAX_CHANNELS]; |
| int32 *integer_signal_mid_side_unaligned[2]; |
| real *real_signal_unaligned[FLAC__MAX_CHANNELS]; |
| real *real_signal_mid_side_unaligned[2]; |
| int32 *residual_workspace_unaligned[FLAC__MAX_CHANNELS][2]; |
| int32 *residual_workspace_mid_side_unaligned[2][2]; |
| uint32 *abs_residual_unaligned; |
| uint32 *abs_residual_partition_sums_unaligned; |
| unsigned *raw_bits_per_partition_unaligned; |
| } FLAC__StreamEncoderPrivate; |
| |
| /*********************************************************************** |
| * |
| * Public static class data |
| * |
| ***********************************************************************/ |
| |
| const char *FLAC__StreamEncoderStateString[] = { |
| "FLAC__STREAM_ENCODER_OK", |
| "FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS", |
| "FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE", |
| "FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE", |
| "FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE", |
| "FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION", |
| "FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH", |
| "FLAC__STREAM_ENCODER_MID_SIDE_SAMPLE_SIZE_MISMATCH", |
| "FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE", |
| "FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER", |
| "FLAC__STREAM_ENCODER_NOT_STREAMABLE", |
| "FLAC__STREAM_ENCODER_FRAMING_ERROR", |
| "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING", |
| "FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING", |
| "FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR", |
| "FLAC__STREAM_ENCODER_ALREADY_INITIALIZED", |
| "FLAC__STREAM_ENCODER_UNINITIALIZED" |
| }; |
| |
| const char *FLAC__StreamEncoderWriteStatusString[] = { |
| "FLAC__STREAM_ENCODER_WRITE_OK", |
| "FLAC__STREAM_ENCODER_WRITE_FATAL_ERROR" |
| }; |
| |
| /*********************************************************************** |
| * |
| * Class constructor/destructor |
| * |
| ***********************************************************************/ |
| FLAC__StreamEncoder *FLAC__stream_encoder_new() |
| { |
| FLAC__StreamEncoder *encoder; |
| |
| FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ |
| |
| encoder = (FLAC__StreamEncoder*)malloc(sizeof(FLAC__StreamEncoder)); |
| if(encoder == 0) { |
| return 0; |
| } |
| encoder->protected = (FLAC__StreamEncoderProtected*)malloc(sizeof(FLAC__StreamEncoderProtected)); |
| if(encoder->protected == 0) { |
| free(encoder); |
| return 0; |
| } |
| encoder->private = (FLAC__StreamEncoderPrivate*)malloc(sizeof(FLAC__StreamEncoderPrivate)); |
| if(encoder->private == 0) { |
| free(encoder->protected); |
| free(encoder); |
| return 0; |
| } |
| |
| encoder->protected->state = FLAC__STREAM_ENCODER_UNINITIALIZED; |
| |
| return encoder; |
| } |
| |
| void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder) |
| { |
| FLAC__ASSERT(encoder != 0); |
| FLAC__ASSERT(encoder->protected != 0); |
| FLAC__ASSERT(encoder->private != 0); |
| |
| free(encoder->private); |
| free(encoder->protected); |
| free(encoder); |
| } |
| |
| /*********************************************************************** |
| * |
| * Public class methods |
| * |
| ***********************************************************************/ |
| |
| FLAC__StreamEncoderState FLAC__stream_encoder_init( |
| FLAC__StreamEncoder *encoder, |
| bool streamable_subset, |
| bool do_mid_side_stereo, |
| bool loose_mid_side_stereo, |
| unsigned channels, |
| unsigned bits_per_sample, |
| unsigned sample_rate, |
| unsigned blocksize, |
| unsigned max_lpc_order, |
| unsigned qlp_coeff_precision, |
| bool do_qlp_coeff_prec_search, |
| bool do_exhaustive_model_search, |
| unsigned min_residual_partition_order, |
| unsigned max_residual_partition_order, |
| unsigned rice_parameter_search_dist, |
| uint64 total_samples_estimate, |
| const FLAC__StreamMetaData_SeekTable *seek_table, |
| unsigned padding, |
| FLAC__StreamEncoderWriteStatus (*write_callback)(const FLAC__StreamEncoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data), |
| void (*metadata_callback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data), |
| void *client_data) |
| { |
| unsigned i; |
| FLAC__StreamMetaData padding_block; |
| FLAC__StreamMetaData seek_table_block; |
| |
| FLAC__ASSERT(encoder != 0); |
| FLAC__ASSERT(write_callback != 0); |
| FLAC__ASSERT(metadata_callback != 0); |
| |
| if(encoder->protected->state != FLAC__STREAM_ENCODER_UNINITIALIZED) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_ALREADY_INITIALIZED; |
| |
| encoder->protected->state = FLAC__STREAM_ENCODER_OK; |
| |
| encoder->protected->streamable_subset = streamable_subset; |
| encoder->protected->do_mid_side_stereo = do_mid_side_stereo; |
| encoder->protected->loose_mid_side_stereo = loose_mid_side_stereo; |
| encoder->protected->channels = channels; |
| encoder->protected->bits_per_sample = bits_per_sample; |
| encoder->protected->sample_rate = sample_rate; |
| encoder->protected->blocksize = blocksize; |
| encoder->protected->max_lpc_order = max_lpc_order; |
| encoder->protected->qlp_coeff_precision = qlp_coeff_precision; |
| encoder->protected->do_qlp_coeff_prec_search = do_qlp_coeff_prec_search; |
| encoder->protected->do_exhaustive_model_search = do_exhaustive_model_search; |
| encoder->protected->min_residual_partition_order = min_residual_partition_order; |
| encoder->protected->max_residual_partition_order = max_residual_partition_order; |
| encoder->protected->rice_parameter_search_dist = rice_parameter_search_dist; |
| encoder->protected->total_samples_estimate = total_samples_estimate; |
| encoder->protected->seek_table = seek_table; |
| encoder->protected->padding = padding; |
| |
| if(encoder->protected->channels == 0 || encoder->protected->channels > FLAC__MAX_CHANNELS) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_NUMBER_OF_CHANNELS; |
| |
| if(encoder->protected->do_mid_side_stereo && encoder->protected->channels != 2) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_MID_SIDE_CHANNELS_MISMATCH; |
| |
| if(encoder->protected->loose_mid_side_stereo && !encoder->protected->do_mid_side_stereo) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_ILLEGAL_MID_SIDE_FORCE; |
| |
| if(encoder->protected->bits_per_sample >= 32) |
| encoder->protected->do_mid_side_stereo = false; /* since we do 32-bit math, the side channel would have 33 bps and overflow */ |
| |
| if(encoder->protected->bits_per_sample < FLAC__MIN_BITS_PER_SAMPLE || encoder->protected->bits_per_sample > FLAC__MAX_BITS_PER_SAMPLE) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_BITS_PER_SAMPLE; |
| |
| if(encoder->protected->sample_rate == 0 || encoder->protected->sample_rate > FLAC__MAX_SAMPLE_RATE) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_SAMPLE_RATE; |
| |
| if(encoder->protected->blocksize < FLAC__MIN_BLOCK_SIZE || encoder->protected->blocksize > FLAC__MAX_BLOCK_SIZE) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_BLOCK_SIZE; |
| |
| if(encoder->protected->blocksize < encoder->protected->max_lpc_order) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER; |
| |
| if(encoder->protected->qlp_coeff_precision == 0) { |
| if(encoder->protected->bits_per_sample < 16) { |
| /* @@@ need some data about how to set this here w.r.t. blocksize and sample rate */ |
| /* @@@ until then we'll make a guess */ |
| encoder->protected->qlp_coeff_precision = max(5, 2 + encoder->protected->bits_per_sample / 2); |
| } |
| else if(encoder->protected->bits_per_sample == 16) { |
| if(encoder->protected->blocksize <= 192) |
| encoder->protected->qlp_coeff_precision = 7; |
| else if(encoder->protected->blocksize <= 384) |
| encoder->protected->qlp_coeff_precision = 8; |
| else if(encoder->protected->blocksize <= 576) |
| encoder->protected->qlp_coeff_precision = 9; |
| else if(encoder->protected->blocksize <= 1152) |
| encoder->protected->qlp_coeff_precision = 10; |
| else if(encoder->protected->blocksize <= 2304) |
| encoder->protected->qlp_coeff_precision = 11; |
| else if(encoder->protected->blocksize <= 4608) |
| encoder->protected->qlp_coeff_precision = 12; |
| else |
| encoder->protected->qlp_coeff_precision = 13; |
| } |
| else { |
| encoder->protected->qlp_coeff_precision = min(13, 8*sizeof(int32) - encoder->protected->bits_per_sample - 1); |
| } |
| } |
| else if(encoder->protected->qlp_coeff_precision < FLAC__MIN_QLP_COEFF_PRECISION || encoder->protected->qlp_coeff_precision + encoder->protected->bits_per_sample >= 8*sizeof(uint32) || encoder->protected->qlp_coeff_precision >= (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_QLP_COEFF_PRECISION; |
| |
| if(encoder->protected->streamable_subset) { |
| //@@@ add check for blocksize here |
| if(encoder->protected->bits_per_sample != 8 && encoder->protected->bits_per_sample != 12 && encoder->protected->bits_per_sample != 16 && encoder->protected->bits_per_sample != 20 && encoder->protected->bits_per_sample != 24) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE; |
| if(encoder->protected->sample_rate > 655350) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_NOT_STREAMABLE; |
| } |
| |
| if(encoder->protected->max_residual_partition_order >= (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN)) |
| encoder->protected->max_residual_partition_order = (1u << FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN) - 1; |
| if(encoder->protected->min_residual_partition_order >= encoder->protected->max_residual_partition_order) |
| encoder->protected->min_residual_partition_order = encoder->protected->max_residual_partition_order; |
| |
| encoder->private->input_capacity = 0; |
| for(i = 0; i < encoder->protected->channels; i++) { |
| encoder->private->integer_signal_unaligned[i] = encoder->private->integer_signal[i] = 0; |
| encoder->private->real_signal_unaligned[i] = encoder->private->real_signal[i] = 0; |
| } |
| for(i = 0; i < 2; i++) { |
| encoder->private->integer_signal_mid_side_unaligned[i] = encoder->private->integer_signal_mid_side[i] = 0; |
| encoder->private->real_signal_mid_side_unaligned[i] = encoder->private->real_signal_mid_side[i] = 0; |
| } |
| for(i = 0; i < encoder->protected->channels; i++) { |
| encoder->private->residual_workspace_unaligned[i][0] = encoder->private->residual_workspace[i][0] = 0; |
| encoder->private->residual_workspace_unaligned[i][1] = encoder->private->residual_workspace[i][1] = 0; |
| encoder->private->best_subframe[i] = 0; |
| } |
| for(i = 0; i < 2; i++) { |
| encoder->private->residual_workspace_mid_side_unaligned[i][0] = encoder->private->residual_workspace_mid_side[i][0] = 0; |
| encoder->private->residual_workspace_mid_side_unaligned[i][1] = encoder->private->residual_workspace_mid_side[i][1] = 0; |
| encoder->private->best_subframe_mid_side[i] = 0; |
| } |
| for(i = 0; i < encoder->protected->channels; i++) { |
| encoder->private->subframe_workspace_ptr[i][0] = &encoder->private->subframe_workspace[i][0]; |
| encoder->private->subframe_workspace_ptr[i][1] = &encoder->private->subframe_workspace[i][1]; |
| } |
| for(i = 0; i < 2; i++) { |
| encoder->private->subframe_workspace_ptr_mid_side[i][0] = &encoder->private->subframe_workspace_mid_side[i][0]; |
| encoder->private->subframe_workspace_ptr_mid_side[i][1] = &encoder->private->subframe_workspace_mid_side[i][1]; |
| } |
| encoder->private->abs_residual_unaligned = encoder->private->abs_residual = 0; |
| encoder->private->abs_residual_partition_sums_unaligned = encoder->private->abs_residual_partition_sums = 0; |
| encoder->private->raw_bits_per_partition_unaligned = encoder->private->raw_bits_per_partition = 0; |
| encoder->private->loose_mid_side_stereo_frames_exact = (double)encoder->protected->sample_rate * 0.4 / (double)encoder->protected->blocksize; |
| encoder->private->loose_mid_side_stereo_frames = (unsigned)(encoder->private->loose_mid_side_stereo_frames_exact + 0.5); |
| if(encoder->private->loose_mid_side_stereo_frames == 0) |
| encoder->private->loose_mid_side_stereo_frames = 1; |
| encoder->private->loose_mid_side_stereo_frame_count = 0; |
| encoder->private->current_sample_number = 0; |
| encoder->private->current_frame_number = 0; |
| |
| /* |
| * get the CPU info and set the function pointers |
| */ |
| FLAC__cpu_info(&encoder->private->cpuinfo); |
| /* first default to the non-asm routines */ |
| encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation; |
| encoder->private->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor; |
| encoder->private->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients; |
| encoder->private->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients; |
| /* now override with asm where appropriate */ |
| #ifndef FLAC__NO_ASM |
| FLAC__ASSERT(encoder->private->cpuinfo.use_asm); |
| #ifdef FLAC__CPU_IA32 |
| FLAC__ASSERT(encoder->private->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32); |
| #ifdef FLAC__HAS_NASM |
| if(0 && encoder->private->cpuinfo.data.ia32.sse) { /* SSE version lacks necessary resolution, plus SSE flag doesn't check for OS support */ |
| if(encoder->protected->max_lpc_order < 4) |
| encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_i386_sse_lag_4; |
| else if(encoder->protected->max_lpc_order < 8) |
| encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_i386_sse_lag_8; |
| else if(encoder->protected->max_lpc_order < 12) |
| encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_i386_sse_lag_12; |
| else |
| encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_i386; |
| } |
| else |
| encoder->private->local_lpc_compute_autocorrelation = FLAC__lpc_compute_autocorrelation_asm_i386; |
| if(encoder->private->cpuinfo.data.ia32.mmx && encoder->private->cpuinfo.data.ia32.cmov) |
| encoder->private->local_fixed_compute_best_predictor = FLAC__fixed_compute_best_predictor_asm_i386_mmx_cmov; |
| if(encoder->private->cpuinfo.data.ia32.mmx) { |
| encoder->private->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_i386; |
| encoder->private->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_i386_mmx; |
| } |
| else { |
| encoder->private->local_lpc_compute_residual_from_qlp_coefficients = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_i386; |
| encoder->private->local_lpc_compute_residual_from_qlp_coefficients_16bit = FLAC__lpc_compute_residual_from_qlp_coefficients_asm_i386; |
| } |
| #endif |
| #endif |
| #endif |
| |
| if(encoder->protected->bits_per_sample + FLAC__bitmath_ilog2(encoder->protected->blocksize)+1 > 30) |
| encoder->private->use_slow = true; |
| else |
| encoder->private->use_slow = false; |
| |
| if(!stream_encoder_resize_buffers_(encoder, encoder->protected->blocksize)) { |
| /* the above function sets the state for us in case of an error */ |
| return encoder->protected->state; |
| } |
| FLAC__bitbuffer_init(&encoder->private->frame); |
| encoder->private->write_callback = write_callback; |
| encoder->private->metadata_callback = metadata_callback; |
| encoder->private->client_data = client_data; |
| |
| /* |
| * write the stream header |
| */ |
| |
| if(!FLAC__bitbuffer_clear(&encoder->private->frame)) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR; |
| if(!FLAC__bitbuffer_write_raw_uint32(&encoder->private->frame, FLAC__STREAM_SYNC, FLAC__STREAM_SYNC_LEN)) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR; |
| |
| encoder->private->metadata.type = FLAC__METADATA_TYPE_STREAMINFO; |
| encoder->private->metadata.is_last = (encoder->protected->seek_table == 0 && encoder->protected->padding == 0); |
| encoder->private->metadata.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH; |
| encoder->private->metadata.data.stream_info.min_blocksize = encoder->protected->blocksize; /* this encoder uses the same blocksize for the whole stream */ |
| encoder->private->metadata.data.stream_info.max_blocksize = encoder->protected->blocksize; |
| encoder->private->metadata.data.stream_info.min_framesize = 0; /* we don't know this yet; have to fill it in later */ |
| encoder->private->metadata.data.stream_info.max_framesize = 0; /* we don't know this yet; have to fill it in later */ |
| encoder->private->metadata.data.stream_info.sample_rate = encoder->protected->sample_rate; |
| encoder->private->metadata.data.stream_info.channels = encoder->protected->channels; |
| encoder->private->metadata.data.stream_info.bits_per_sample = encoder->protected->bits_per_sample; |
| encoder->private->metadata.data.stream_info.total_samples = encoder->protected->total_samples_estimate; /* we will replace this later with the real total */ |
| memset(encoder->private->metadata.data.stream_info.md5sum, 0, 16); /* we don't know this yet; have to fill it in later */ |
| MD5Init(&encoder->private->md5context); |
| if(!FLAC__add_metadata_block(&encoder->private->metadata, &encoder->private->frame)) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR; |
| |
| if(0 != encoder->protected->seek_table) { |
| if(!FLAC__seek_table_is_valid(encoder->protected->seek_table)) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_INVALID_SEEK_TABLE; |
| seek_table_block.type = FLAC__METADATA_TYPE_SEEKTABLE; |
| seek_table_block.is_last = (encoder->protected->padding == 0); |
| seek_table_block.length = encoder->protected->seek_table->num_points * FLAC__STREAM_METADATA_SEEKPOINT_LEN; |
| seek_table_block.data.seek_table = *encoder->protected->seek_table; |
| if(!FLAC__add_metadata_block(&seek_table_block, &encoder->private->frame)) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR; |
| } |
| |
| /* add a PADDING block if requested */ |
| if(encoder->protected->padding > 0) { |
| padding_block.type = FLAC__METADATA_TYPE_PADDING; |
| padding_block.is_last = true; |
| padding_block.length = encoder->protected->padding; |
| if(!FLAC__add_metadata_block(&padding_block, &encoder->private->frame)) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR; |
| } |
| |
| FLAC__ASSERT(encoder->private->frame.bits == 0); /* assert that we're byte-aligned before writing */ |
| FLAC__ASSERT(encoder->private->frame.total_consumed_bits == 0); /* assert that no reading of the buffer was done */ |
| if(encoder->private->write_callback(encoder, encoder->private->frame.buffer, encoder->private->frame.bytes, 0, encoder->private->current_frame_number, encoder->private->client_data) != FLAC__STREAM_ENCODER_WRITE_OK) |
| return encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING; |
| |
| /* now that the metadata block is written, we can init this to an absurdly-high value... */ |
| encoder->private->metadata.data.stream_info.min_framesize = (1u << FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN) - 1; |
| /* ... and clear this to 0 */ |
| encoder->private->metadata.data.stream_info.total_samples = 0; |
| |
| return encoder->protected->state; |
| } |
| |
| void FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder) |
| { |
| unsigned i, channel; |
| |
| FLAC__ASSERT(encoder != 0); |
| if(encoder->protected->state == FLAC__STREAM_ENCODER_UNINITIALIZED) |
| return; |
| if(encoder->private->current_sample_number != 0) { |
| encoder->protected->blocksize = encoder->private->current_sample_number; |
| stream_encoder_process_frame_(encoder, true); /* true => is last frame */ |
| } |
| MD5Final(encoder->private->metadata.data.stream_info.md5sum, &encoder->private->md5context); |
| encoder->private->metadata_callback(encoder, &encoder->private->metadata, encoder->private->client_data); |
| for(i = 0; i < encoder->protected->channels; i++) { |
| if(encoder->private->integer_signal_unaligned[i] != 0) { |
| free(encoder->private->integer_signal_unaligned[i]); |
| encoder->private->integer_signal_unaligned[i] = 0; |
| } |
| if(encoder->private->real_signal_unaligned[i] != 0) { |
| free(encoder->private->real_signal_unaligned[i]); |
| encoder->private->real_signal_unaligned[i] = 0; |
| } |
| } |
| for(i = 0; i < 2; i++) { |
| if(encoder->private->integer_signal_mid_side_unaligned[i] != 0) { |
| free(encoder->private->integer_signal_mid_side_unaligned[i]); |
| encoder->private->integer_signal_mid_side_unaligned[i] = 0; |
| } |
| if(encoder->private->real_signal_mid_side_unaligned[i] != 0) { |
| free(encoder->private->real_signal_mid_side_unaligned[i]); |
| encoder->private->real_signal_mid_side_unaligned[i] = 0; |
| } |
| } |
| for(channel = 0; channel < encoder->protected->channels; channel++) { |
| for(i = 0; i < 2; i++) { |
| if(encoder->private->residual_workspace_unaligned[channel][i] != 0) { |
| free(encoder->private->residual_workspace_unaligned[channel][i]); |
| encoder->private->residual_workspace_unaligned[channel][i] = 0; |
| } |
| } |
| } |
| for(channel = 0; channel < 2; channel++) { |
| for(i = 0; i < 2; i++) { |
| if(encoder->private->residual_workspace_mid_side_unaligned[channel][i] != 0) { |
| free(encoder->private->residual_workspace_mid_side_unaligned[channel][i]); |
| encoder->private->residual_workspace_mid_side_unaligned[channel][i] = 0; |
| } |
| } |
| } |
| if(encoder->private->abs_residual_unaligned != 0) { |
| free(encoder->private->abs_residual_unaligned); |
| encoder->private->abs_residual_unaligned = 0; |
| } |
| if(encoder->private->abs_residual_partition_sums_unaligned != 0) { |
| free(encoder->private->abs_residual_partition_sums_unaligned); |
| encoder->private->abs_residual_partition_sums_unaligned = 0; |
| } |
| if(encoder->private->raw_bits_per_partition_unaligned != 0) { |
| free(encoder->private->raw_bits_per_partition_unaligned); |
| encoder->private->raw_bits_per_partition_unaligned = 0; |
| } |
| FLAC__bitbuffer_free(&encoder->private->frame); |
| |
| encoder->protected->state = FLAC__STREAM_ENCODER_UNINITIALIZED; |
| } |
| |
| FLAC__StreamEncoderState FLAC__stream_encoder_state(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->state; |
| } |
| |
| bool FLAC__stream_encoder_streamable_subset(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->streamable_subset; |
| } |
| |
| bool FLAC__stream_encoder_do_mid_side_stereo(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->do_mid_side_stereo; |
| } |
| |
| bool FLAC__stream_encoder_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->loose_mid_side_stereo; |
| } |
| |
| unsigned FLAC__stream_encoder_channels(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->channels; |
| } |
| |
| unsigned FLAC__stream_encoder_bits_per_sample(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->bits_per_sample; |
| } |
| |
| unsigned FLAC__stream_encoder_sample_rate(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->sample_rate; |
| } |
| |
| unsigned FLAC__stream_encoder_blocksize(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->blocksize; |
| } |
| |
| unsigned FLAC__stream_encoder_max_lpc_order(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->max_lpc_order; |
| } |
| |
| unsigned FLAC__stream_encoder_qlp_coeff_precision(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->qlp_coeff_precision; |
| } |
| |
| bool FLAC__stream_encoder_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->do_qlp_coeff_prec_search; |
| } |
| |
| bool FLAC__stream_encoder_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->do_exhaustive_model_search; |
| } |
| |
| unsigned FLAC__stream_encoder_min_residual_partition_order(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->min_residual_partition_order; |
| } |
| |
| unsigned FLAC__stream_encoder_max_residual_partition_order(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->max_residual_partition_order; |
| } |
| |
| unsigned FLAC__stream_encoder_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder) |
| { |
| return encoder->protected->rice_parameter_search_dist; |
| } |
| |
| bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const int32 *buf[], unsigned samples) |
| { |
| unsigned i, j, channel; |
| int32 x, mid, side; |
| const unsigned channels = encoder->protected->channels, blocksize = encoder->protected->blocksize; |
| |
| FLAC__ASSERT(encoder != 0); |
| FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK); |
| |
| j = 0; |
| if(encoder->protected->do_mid_side_stereo && channels == 2) { |
| do { |
| for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) { |
| x = mid = side = buf[0][j]; |
| encoder->private->integer_signal[0][i] = x; |
| encoder->private->real_signal[0][i] = (real)x; |
| x = buf[1][j]; |
| encoder->private->integer_signal[1][i] = x; |
| encoder->private->real_signal[1][i] = (real)x; |
| mid += x; |
| side -= x; |
| mid >>= 1; /* NOTE: not the same as 'mid = (buf[0][j] + buf[1][j]) / 2' ! */ |
| encoder->private->integer_signal_mid_side[1][i] = side; |
| encoder->private->integer_signal_mid_side[0][i] = mid; |
| encoder->private->real_signal_mid_side[1][i] = (real)side; |
| encoder->private->real_signal_mid_side[0][i] = (real)mid; |
| encoder->private->current_sample_number++; |
| } |
| if(i == blocksize) { |
| if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */ |
| return false; |
| } |
| } while(j < samples); |
| } |
| else { |
| do { |
| for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) { |
| for(channel = 0; channel < channels; channel++) { |
| x = buf[channel][j]; |
| encoder->private->integer_signal[channel][i] = x; |
| encoder->private->real_signal[channel][i] = (real)x; |
| } |
| encoder->private->current_sample_number++; |
| } |
| if(i == blocksize) { |
| if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */ |
| return false; |
| } |
| } while(j < samples); |
| } |
| |
| return true; |
| } |
| |
| /* 'samples' is channel-wide samples, e.g. for 1 second at 44100Hz, 'samples' = 44100 regardless of the number of channels */ |
| bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const int32 buf[], unsigned samples) |
| { |
| unsigned i, j, k, channel; |
| int32 x, mid, side; |
| const unsigned channels = encoder->protected->channels, blocksize = encoder->protected->blocksize; |
| |
| FLAC__ASSERT(encoder != 0); |
| FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK); |
| |
| j = k = 0; |
| if(encoder->protected->do_mid_side_stereo && channels == 2) { |
| do { |
| for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) { |
| x = mid = side = buf[k++]; |
| encoder->private->integer_signal[0][i] = x; |
| encoder->private->real_signal[0][i] = (real)x; |
| x = buf[k++]; |
| encoder->private->integer_signal[1][i] = x; |
| encoder->private->real_signal[1][i] = (real)x; |
| mid += x; |
| side -= x; |
| mid >>= 1; /* NOTE: not the same as 'mid = (left + right) / 2' ! */ |
| encoder->private->integer_signal_mid_side[1][i] = side; |
| encoder->private->integer_signal_mid_side[0][i] = mid; |
| encoder->private->real_signal_mid_side[1][i] = (real)side; |
| encoder->private->real_signal_mid_side[0][i] = (real)mid; |
| encoder->private->current_sample_number++; |
| } |
| if(i == blocksize) { |
| if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */ |
| return false; |
| } |
| } while(j < samples); |
| } |
| else { |
| do { |
| for(i = encoder->private->current_sample_number; i < blocksize && j < samples; i++, j++) { |
| for(channel = 0; channel < channels; channel++) { |
| x = buf[k++]; |
| encoder->private->integer_signal[channel][i] = x; |
| encoder->private->real_signal[channel][i] = (real)x; |
| } |
| encoder->private->current_sample_number++; |
| } |
| if(i == blocksize) { |
| if(!stream_encoder_process_frame_(encoder, false)) /* false => not last frame */ |
| return false; |
| } |
| } while(j < samples); |
| } |
| |
| return true; |
| } |
| |
| bool stream_encoder_resize_buffers_(FLAC__StreamEncoder *encoder, unsigned new_size) |
| { |
| bool ok; |
| unsigned i, channel; |
| |
| FLAC__ASSERT(new_size > 0); |
| FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK); |
| FLAC__ASSERT(encoder->private->current_sample_number == 0); |
| |
| /* To avoid excessive malloc'ing, we only grow the buffer; no shrinking. */ |
| if(new_size <= encoder->private->input_capacity) |
| return true; |
| |
| ok = true; |
| for(i = 0; ok && i < encoder->protected->channels; i++) { |
| ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private->integer_signal_unaligned[i], &encoder->private->integer_signal[i]); |
| ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private->real_signal_unaligned[i], &encoder->private->real_signal[i]); |
| } |
| for(i = 0; ok && i < 2; i++) { |
| ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private->integer_signal_mid_side_unaligned[i], &encoder->private->integer_signal_mid_side[i]); |
| ok = ok && FLAC__memory_alloc_aligned_real_array(new_size, &encoder->private->real_signal_mid_side_unaligned[i], &encoder->private->real_signal_mid_side[i]); |
| } |
| for(channel = 0; ok && channel < encoder->protected->channels; channel++) { |
| for(i = 0; ok && i < 2; i++) { |
| ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private->residual_workspace_unaligned[channel][i], &encoder->private->residual_workspace[channel][i]); |
| } |
| } |
| for(channel = 0; ok && channel < 2; channel++) { |
| for(i = 0; ok && i < 2; i++) { |
| ok = ok && FLAC__memory_alloc_aligned_int32_array(new_size, &encoder->private->residual_workspace_mid_side_unaligned[channel][i], &encoder->private->residual_workspace_mid_side[channel][i]); |
| } |
| } |
| ok = ok && FLAC__memory_alloc_aligned_uint32_array(new_size, &encoder->private->abs_residual_unaligned, &encoder->private->abs_residual); |
| #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS |
| ok = ok && FLAC__memory_alloc_aligned_uint32_array(new_size * 2, &encoder->private->abs_residual_partition_sums_unaligned, &encoder->private->abs_residual_partition_sums); |
| #endif |
| #ifdef FLAC__SEARCH_FOR_ESCAPES |
| ok = ok && FLAC__memory_alloc_aligned_unsigned_array(new_size * 2, &encoder->private->raw_bits_per_partition_unaligned, &encoder->private->raw_bits_per_partition); |
| #endif |
| |
| if(ok) |
| encoder->private->input_capacity = new_size; |
| else |
| encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR; |
| |
| return ok; |
| } |
| |
| /*********************************************************************** |
| * |
| * Private class methods |
| * |
| ***********************************************************************/ |
| |
| bool stream_encoder_process_frame_(FLAC__StreamEncoder *encoder, bool is_last_frame) |
| { |
| FLAC__ASSERT(encoder->protected->state == FLAC__STREAM_ENCODER_OK); |
| |
| /* |
| * Accumulate raw signal to the MD5 signature |
| */ |
| /* NOTE: some versions of GCC can't figure out const-ness right and will give you an 'incompatible pointer type' warning on arg 2 here: */ |
| if(!FLAC__MD5Accumulate(&encoder->private->md5context, encoder->private->integer_signal, encoder->protected->channels, encoder->protected->blocksize, (encoder->protected->bits_per_sample+7) / 8)) { |
| encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR; |
| return false; |
| } |
| |
| /* |
| * Process the frame header and subframes into the frame bitbuffer |
| */ |
| if(!stream_encoder_process_subframes_(encoder, is_last_frame)) { |
| /* the above function sets the state for us in case of an error */ |
| return false; |
| } |
| |
| /* |
| * Zero-pad the frame to a byte_boundary |
| */ |
| if(!FLAC__bitbuffer_zero_pad_to_byte_boundary(&encoder->private->frame)) { |
| encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR; |
| return false; |
| } |
| |
| /* |
| * CRC-16 the whole thing |
| */ |
| FLAC__ASSERT(encoder->private->frame.bits == 0); /* assert that we're byte-aligned */ |
| FLAC__ASSERT(encoder->private->frame.total_consumed_bits == 0); /* assert that no reading of the buffer was done */ |
| FLAC__bitbuffer_write_raw_uint32(&encoder->private->frame, FLAC__crc16(encoder->private->frame.buffer, encoder->private->frame.bytes), FLAC__FRAME_FOOTER_CRC_LEN); |
| |
| /* |
| * Write it |
| */ |
| if(encoder->private->write_callback(encoder, encoder->private->frame.buffer, encoder->private->frame.bytes, encoder->protected->blocksize, encoder->private->current_frame_number, encoder->private->client_data) != FLAC__STREAM_ENCODER_WRITE_OK) { |
| encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_WRITING; |
| return false; |
| } |
| |
| /* |
| * Get ready for the next frame |
| */ |
| encoder->private->current_sample_number = 0; |
| encoder->private->current_frame_number++; |
| encoder->private->metadata.data.stream_info.total_samples += (uint64)encoder->protected->blocksize; |
| encoder->private->metadata.data.stream_info.min_framesize = min(encoder->private->frame.bytes, encoder->private->metadata.data.stream_info.min_framesize); |
| encoder->private->metadata.data.stream_info.max_framesize = max(encoder->private->frame.bytes, encoder->private->metadata.data.stream_info.max_framesize); |
| |
| return true; |
| } |
| |
| bool stream_encoder_process_subframes_(FLAC__StreamEncoder *encoder, bool is_last_frame) |
| { |
| FLAC__FrameHeader frame_header; |
| unsigned channel, min_partition_order = encoder->protected->min_residual_partition_order, max_partition_order; |
| bool do_independent, do_mid_side; |
| |
| /* |
| * Calculate the min,max Rice partition orders |
| */ |
| if(is_last_frame) { |
| max_partition_order = 0; |
| } |
| else { |
| unsigned limit = 0, b = encoder->protected->blocksize; |
| while(!(b & 1)) { |
| limit++; |
| b >>= 1; |
| } |
| max_partition_order = min(encoder->protected->max_residual_partition_order, limit); |
| } |
| min_partition_order = min(min_partition_order, max_partition_order); |
| |
| /* |
| * Setup the frame |
| */ |
| if(!FLAC__bitbuffer_clear(&encoder->private->frame)) { |
| encoder->protected->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR; |
| return false; |
| } |
| frame_header.blocksize = encoder->protected->blocksize; |
| frame_header.sample_rate = encoder->protected->sample_rate; |
| frame_header.channels = encoder->protected->channels; |
| frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */ |
| frame_header.bits_per_sample = encoder->protected->bits_per_sample; |
| frame_header.number.frame_number = encoder->private->current_frame_number; |
| |
| /* |
| * Figure out what channel assignments to try |
| */ |
| if(encoder->protected->do_mid_side_stereo) { |
| if(encoder->protected->loose_mid_side_stereo) { |
| if(encoder->private->loose_mid_side_stereo_frame_count == 0) { |
| do_independent = true; |
| do_mid_side = true; |
| } |
| else { |
| do_independent = (encoder->private->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT); |
| do_mid_side = !do_independent; |
| } |
| } |
| else { |
| do_independent = true; |
| do_mid_side = true; |
| } |
| } |
| else { |
| do_independent = true; |
| do_mid_side = false; |
| } |
| |
| FLAC__ASSERT(do_independent || do_mid_side); |
| |
| /* |
| * Check for wasted bits; set effective bps for each subframe |
| */ |
| if(do_independent) { |
| unsigned w; |
| for(channel = 0; channel < encoder->protected->channels; channel++) { |
| w = stream_encoder_get_wasted_bits_(encoder->private->integer_signal[channel], encoder->protected->blocksize); |
| encoder->private->subframe_workspace[channel][0].wasted_bits = encoder->private->subframe_workspace[channel][1].wasted_bits = w; |
| encoder->private->subframe_bps[channel] = encoder->protected->bits_per_sample - w; |
| } |
| } |
| if(do_mid_side) { |
| unsigned w; |
| FLAC__ASSERT(encoder->protected->channels == 2); |
| for(channel = 0; channel < 2; channel++) { |
| w = stream_encoder_get_wasted_bits_(encoder->private->integer_signal_mid_side[channel], encoder->protected->blocksize); |
| encoder->private->subframe_workspace_mid_side[channel][0].wasted_bits = encoder->private->subframe_workspace_mid_side[channel][1].wasted_bits = w; |
| encoder->private->subframe_bps_mid_side[channel] = encoder->protected->bits_per_sample - w + (channel==0? 0:1); |
| } |
| } |
| |
| /* |
| * First do a normal encoding pass of each independent channel |
| */ |
| if(do_independent) { |
| for(channel = 0; channel < encoder->protected->channels; channel++) { |
| if(!stream_encoder_process_subframe_(encoder, min_partition_order, max_partition_order, false, &frame_header, encoder->private->subframe_bps[channel], encoder->private->integer_signal[channel], encoder->private->real_signal[channel], encoder->private->subframe_workspace_ptr[channel], encoder->private->residual_workspace[channel], encoder->private->best_subframe+channel, encoder->private->best_subframe_bits+channel)) |
| return false; |
| } |
| } |
| |
| /* |
| * Now do mid and side channels if requested |
| */ |
| if(do_mid_side) { |
| FLAC__ASSERT(encoder->protected->channels == 2); |
| |
| for(channel = 0; channel < 2; channel++) { |
| if(!stream_encoder_process_subframe_(encoder, min_partition_order, max_partition_order, false, &frame_header, encoder->private->subframe_bps_mid_side[channel], encoder->private->integer_signal_mid_side[channel], encoder->private->real_signal_mid_side[channel], encoder->private->subframe_workspace_ptr_mid_side[channel], encoder->private->residual_workspace_mid_side[channel], encoder->private->best_subframe_mid_side+channel, encoder->private->best_subframe_bits_mid_side+channel)) |
| return false; |
| } |
| } |
| |
| /* |
| * Compose the frame bitbuffer |
| */ |
| if(do_mid_side) { |
| unsigned left_bps = 0, right_bps = 0; /* initialized only to prevent superfluous compiler warning */ |
| FLAC__Subframe *left_subframe = 0, *right_subframe = 0; /* initialized only to prevent superfluous compiler warning */ |
| FLAC__ChannelAssignment channel_assignment; |
| |
| FLAC__ASSERT(encoder->protected->channels == 2); |
| |
| if(encoder->protected->loose_mid_side_stereo && encoder->private->loose_mid_side_stereo_frame_count > 0) { |
| channel_assignment = (encoder->private->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT? FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT : FLAC__CHANNEL_ASSIGNMENT_MID_SIDE); |
| } |
| else { |
| unsigned bits[4]; /* WATCHOUT - indexed by FLAC__ChannelAssignment */ |
| unsigned min_bits; |
| FLAC__ChannelAssignment ca; |
| |
| FLAC__ASSERT(do_independent && do_mid_side); |
| |
| /* We have to figure out which channel assignent results in the smallest frame */ |
| bits[FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT] = encoder->private->best_subframe_bits [0] + encoder->private->best_subframe_bits [1]; |
| bits[FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE ] = encoder->private->best_subframe_bits [0] + encoder->private->best_subframe_bits_mid_side[1]; |
| bits[FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE ] = encoder->private->best_subframe_bits [1] + encoder->private->best_subframe_bits_mid_side[1]; |
| bits[FLAC__CHANNEL_ASSIGNMENT_MID_SIDE ] = encoder->private->best_subframe_bits_mid_side[0] + encoder->private->best_subframe_bits_mid_side[1]; |
| |
| for(channel_assignment = 0, min_bits = bits[0], ca = 1; ca <= 3; ca++) { |
| if(bits[ca] < min_bits) { |
| min_bits = bits[ca]; |
| channel_assignment = ca; |
| } |
| } |
| } |
| |
| frame_header.channel_assignment = channel_assignment; |
| |
| if(!FLAC__frame_add_header(&frame_header, encoder->protected->streamable_subset, is_last_frame, &encoder->private->frame)) { |
| encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR; |
| return false; |
| } |
| |
| switch(channel_assignment) { |
| case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT: |
| left_subframe = &encoder->private->subframe_workspace [0][encoder->private->best_subframe [0]]; |
| right_subframe = &encoder->private->subframe_workspace [1][encoder->private->best_subframe [1]]; |
| break; |
| case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE: |
| left_subframe = &encoder->private->subframe_workspace [0][encoder->private->best_subframe [0]]; |
| right_subframe = &encoder->private->subframe_workspace_mid_side[1][encoder->private->best_subframe_mid_side[1]]; |
| break; |
| case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE: |
| left_subframe = &encoder->private->subframe_workspace_mid_side[1][encoder->private->best_subframe_mid_side[1]]; |
| right_subframe = &encoder->private->subframe_workspace [1][encoder->private->best_subframe [1]]; |
| break; |
| case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE: |
| left_subframe = &encoder->private->subframe_workspace_mid_side[0][encoder->private->best_subframe_mid_side[0]]; |
| right_subframe = &encoder->private->subframe_workspace_mid_side[1][encoder->private->best_subframe_mid_side[1]]; |
| break; |
| default: |
| FLAC__ASSERT(0); |
| } |
| |
| switch(channel_assignment) { |
| case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT: |
| left_bps = encoder->private->subframe_bps [0]; |
| right_bps = encoder->private->subframe_bps [1]; |
| break; |
| case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE: |
| left_bps = encoder->private->subframe_bps [0]; |
| right_bps = encoder->private->subframe_bps_mid_side[1]; |
| break; |
| case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE: |
| left_bps = encoder->private->subframe_bps_mid_side[1]; |
| right_bps = encoder->private->subframe_bps [1]; |
| break; |
| case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE: |
| left_bps = encoder->private->subframe_bps_mid_side[0]; |
| right_bps = encoder->private->subframe_bps_mid_side[1]; |
| break; |
| default: |
| FLAC__ASSERT(0); |
| } |
| |
| /* note that encoder_add_subframe_ sets the state for us in case of an error */ |
| if(!stream_encoder_add_subframe_(encoder, &frame_header, left_bps , left_subframe , &encoder->private->frame)) |
| return false; |
| if(!stream_encoder_add_subframe_(encoder, &frame_header, right_bps, right_subframe, &encoder->private->frame)) |
| return false; |
| } |
| else { |
| if(!FLAC__frame_add_header(&frame_header, encoder->protected->streamable_subset, is_last_frame, &encoder->private->frame)) { |
| encoder->protected->state = FLAC__STREAM_ENCODER_FRAMING_ERROR; |
| return false; |
| } |
| |
| for(channel = 0; channel < encoder->protected->channels; channel++) { |
| if(!stream_encoder_add_subframe_(encoder, &frame_header, encoder->private->subframe_bps[channel], &encoder->private->subframe_workspace[channel][encoder->private->best_subframe[channel]], &encoder->private->frame)) { |
| /* the above function sets the state for us in case of an error */ |
| return false; |
| } |
| } |
| } |
| |
| if(encoder->protected->loose_mid_side_stereo) { |
| encoder->private->loose_mid_side_stereo_frame_count++; |
| if(encoder->private->loose_mid_side_stereo_frame_count >= encoder->private->loose_mid_side_stereo_frames) |
| encoder->private->loose_mid_side_stereo_frame_count = 0; |
| } |
| |
| encoder->private->last_channel_assignment = frame_header.channel_assignment; |
| |
| return true; |
| } |
| |
| bool stream_encoder_process_subframe_(FLAC__StreamEncoder *encoder, unsigned min_partition_order, unsigned max_partition_order, bool verbatim_only, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const int32 integer_signal[], const real real_signal[], FLAC__Subframe *subframe[2], int32 *residual[2], unsigned *best_subframe, unsigned *best_bits) |
| { |
| real fixed_residual_bits_per_sample[FLAC__MAX_FIXED_ORDER+1]; |
| real lpc_residual_bits_per_sample; |
| real autoc[FLAC__MAX_LPC_ORDER+1]; /* WATCHOUT: the size is important even though encoder->protected->max_lpc_order might be less; some asm routines need all the space */ |
| real lp_coeff[FLAC__MAX_LPC_ORDER][FLAC__MAX_LPC_ORDER]; |
| real lpc_error[FLAC__MAX_LPC_ORDER]; |
| unsigned min_lpc_order, max_lpc_order, lpc_order; |
| unsigned min_fixed_order, max_fixed_order, guess_fixed_order, fixed_order; |
| unsigned min_qlp_coeff_precision, max_qlp_coeff_precision, qlp_coeff_precision; |
| unsigned rice_parameter; |
| unsigned _candidate_bits, _best_bits; |
| unsigned _best_subframe; |
| |
| /* verbatim subframe is the baseline against which we measure other compressed subframes */ |
| _best_subframe = 0; |
| _best_bits = stream_encoder_evaluate_verbatim_subframe_(integer_signal, frame_header->blocksize, subframe_bps, subframe[_best_subframe]); |
| |
| if(!verbatim_only && frame_header->blocksize >= FLAC__MAX_FIXED_ORDER) { |
| /* check for constant subframe */ |
| if(encoder->private->use_slow) |
| guess_fixed_order = FLAC__fixed_compute_best_predictor_slow(integer_signal+FLAC__MAX_FIXED_ORDER, frame_header->blocksize-FLAC__MAX_FIXED_ORDER, fixed_residual_bits_per_sample); |
| else |
| guess_fixed_order = encoder->private->local_fixed_compute_best_predictor(integer_signal+FLAC__MAX_FIXED_ORDER, frame_header->blocksize-FLAC__MAX_FIXED_ORDER, fixed_residual_bits_per_sample); |
| if(fixed_residual_bits_per_sample[1] == 0.0) { |
| /* the above means integer_signal+FLAC__MAX_FIXED_ORDER is constant, now we just have to check the warmup samples */ |
| unsigned i, signal_is_constant = true; |
| for(i = 1; i <= FLAC__MAX_FIXED_ORDER; i++) { |
| if(integer_signal[0] != integer_signal[i]) { |
| signal_is_constant = false; |
| break; |
| } |
| } |
| if(signal_is_constant) { |
| _candidate_bits = stream_encoder_evaluate_constant_subframe_(integer_signal[0], subframe_bps, subframe[!_best_subframe]); |
| if(_candidate_bits < _best_bits) { |
| _best_subframe = !_best_subframe; |
| _best_bits = _candidate_bits; |
| } |
| } |
| } |
| else { |
| /* encode fixed */ |
| if(encoder->protected->do_exhaustive_model_search) { |
| min_fixed_order = 0; |
| max_fixed_order = FLAC__MAX_FIXED_ORDER; |
| } |
| else { |
| min_fixed_order = max_fixed_order = guess_fixed_order; |
| } |
| for(fixed_order = min_fixed_order; fixed_order <= max_fixed_order; fixed_order++) { |
| if(fixed_residual_bits_per_sample[fixed_order] >= (real)subframe_bps) |
| continue; /* don't even try */ |
| rice_parameter = (fixed_residual_bits_per_sample[fixed_order] > 0.0)? (unsigned)(fixed_residual_bits_per_sample[fixed_order]+0.5) : 0; /* 0.5 is for rounding */ |
| #ifndef FLAC__SYMMETRIC_RICE |
| rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */ |
| #endif |
| if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) |
| rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1; |
| _candidate_bits = stream_encoder_evaluate_fixed_subframe_(integer_signal, residual[!_best_subframe], encoder->private->abs_residual, encoder->private->abs_residual_partition_sums, encoder->private->raw_bits_per_partition, frame_header->blocksize, subframe_bps, fixed_order, rice_parameter, min_partition_order, max_partition_order, encoder->protected->rice_parameter_search_dist, subframe[!_best_subframe]); |
| if(_candidate_bits < _best_bits) { |
| _best_subframe = !_best_subframe; |
| _best_bits = _candidate_bits; |
| } |
| } |
| |
| /* encode lpc */ |
| if(encoder->protected->max_lpc_order > 0) { |
| if(encoder->protected->max_lpc_order >= frame_header->blocksize) |
| max_lpc_order = frame_header->blocksize-1; |
| else |
| max_lpc_order = encoder->protected->max_lpc_order; |
| if(max_lpc_order > 0) { |
| encoder->private->local_lpc_compute_autocorrelation(real_signal, frame_header->blocksize, max_lpc_order+1, autoc); |
| /* if autoc[0] == 0.0, the signal is constant and we usually won't get here, but it can happen */ |
| if(autoc[0] != 0.0) { |
| FLAC__lpc_compute_lp_coefficients(autoc, max_lpc_order, lp_coeff, lpc_error); |
| if(encoder->protected->do_exhaustive_model_search) { |
| min_lpc_order = 1; |
| } |
| else { |
| unsigned guess_lpc_order = FLAC__lpc_compute_best_order(lpc_error, max_lpc_order, frame_header->blocksize, subframe_bps); |
| min_lpc_order = max_lpc_order = guess_lpc_order; |
| } |
| if(encoder->protected->do_qlp_coeff_prec_search) { |
| min_qlp_coeff_precision = FLAC__MIN_QLP_COEFF_PRECISION; |
| max_qlp_coeff_precision = min(32 - subframe_bps - 1, (1u<<FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)-1); |
| } |
| else { |
| min_qlp_coeff_precision = max_qlp_coeff_precision = encoder->protected->qlp_coeff_precision; |
| } |
| for(lpc_order = min_lpc_order; lpc_order <= max_lpc_order; lpc_order++) { |
| lpc_residual_bits_per_sample = FLAC__lpc_compute_expected_bits_per_residual_sample(lpc_error[lpc_order-1], frame_header->blocksize-lpc_order); |
| if(lpc_residual_bits_per_sample >= (real)subframe_bps) |
| continue; /* don't even try */ |
| rice_parameter = (lpc_residual_bits_per_sample > 0.0)? (unsigned)(lpc_residual_bits_per_sample+0.5) : 0; /* 0.5 is for rounding */ |
| #ifndef FLAC__SYMMETRIC_RICE |
| rice_parameter++; /* to account for the signed->unsigned conversion during rice coding */ |
| #endif |
| if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) |
| rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1; |
| for(qlp_coeff_precision = min_qlp_coeff_precision; qlp_coeff_precision <= max_qlp_coeff_precision; qlp_coeff_precision++) { |
| _candidate_bits = stream_encoder_evaluate_lpc_subframe_(encoder, integer_signal, residual[!_best_subframe], encoder->private->abs_residual, encoder->private->abs_residual_partition_sums, encoder->private->raw_bits_per_partition, lp_coeff[lpc_order-1], frame_header->blocksize, subframe_bps, lpc_order, qlp_coeff_precision, rice_parameter, min_partition_order, max_partition_order, encoder->protected->rice_parameter_search_dist, subframe[!_best_subframe]); |
| if(_candidate_bits > 0) { /* if == 0, there was a problem quantizing the lpcoeffs */ |
| if(_candidate_bits < _best_bits) { |
| _best_subframe = !_best_subframe; |
| _best_bits = _candidate_bits; |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| *best_subframe = _best_subframe; |
| *best_bits = _best_bits; |
| |
| return true; |
| } |
| |
| bool stream_encoder_add_subframe_(FLAC__StreamEncoder *encoder, const FLAC__FrameHeader *frame_header, unsigned subframe_bps, const FLAC__Subframe *subframe, FLAC__BitBuffer *frame) |
| { |
| switch(subframe->type) { |
| case FLAC__SUBFRAME_TYPE_CONSTANT: |
| if(!FLAC__subframe_add_constant(&(subframe->data.constant), subframe_bps, subframe->wasted_bits, frame)) { |
| encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING; |
| return false; |
| } |
| break; |
| case FLAC__SUBFRAME_TYPE_FIXED: |
| if(!FLAC__subframe_add_fixed(&(subframe->data.fixed), frame_header->blocksize - subframe->data.fixed.order, subframe_bps, subframe->wasted_bits, frame)) { |
| encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING; |
| return false; |
| } |
| break; |
| case FLAC__SUBFRAME_TYPE_LPC: |
| if(!FLAC__subframe_add_lpc(&(subframe->data.lpc), frame_header->blocksize - subframe->data.lpc.order, subframe_bps, subframe->wasted_bits, frame)) { |
| encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING; |
| return false; |
| } |
| break; |
| case FLAC__SUBFRAME_TYPE_VERBATIM: |
| if(!FLAC__subframe_add_verbatim(&(subframe->data.verbatim), frame_header->blocksize, subframe_bps, subframe->wasted_bits, frame)) { |
| encoder->protected->state = FLAC__STREAM_ENCODER_FATAL_ERROR_WHILE_ENCODING; |
| return false; |
| } |
| break; |
| default: |
| FLAC__ASSERT(0); |
| } |
| |
| return true; |
| } |
| |
| unsigned stream_encoder_evaluate_constant_subframe_(const int32 signal, unsigned subframe_bps, FLAC__Subframe *subframe) |
| { |
| subframe->type = FLAC__SUBFRAME_TYPE_CONSTANT; |
| subframe->data.constant.value = signal; |
| |
| return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + subframe_bps; |
| } |
| |
| unsigned stream_encoder_evaluate_fixed_subframe_(const int32 signal[], int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe) |
| { |
| unsigned i, residual_bits; |
| const unsigned residual_samples = blocksize - order; |
| |
| FLAC__fixed_compute_residual(signal+order, residual_samples, order, residual); |
| |
| subframe->type = FLAC__SUBFRAME_TYPE_FIXED; |
| |
| subframe->data.fixed.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE; |
| subframe->data.fixed.residual = residual; |
| |
| residual_bits = stream_encoder_find_best_partition_order_(residual, abs_residual, abs_residual_partition_sums, raw_bits_per_partition, residual_samples, order, rice_parameter, min_partition_order, max_partition_order, rice_parameter_search_dist, &subframe->data.fixed.entropy_coding_method.data.partitioned_rice.order, subframe->data.fixed.entropy_coding_method.data.partitioned_rice.parameters, subframe->data.fixed.entropy_coding_method.data.partitioned_rice.raw_bits); |
| |
| subframe->data.fixed.order = order; |
| for(i = 0; i < order; i++) |
| subframe->data.fixed.warmup[i] = signal[i]; |
| |
| return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (order * subframe_bps) + residual_bits; |
| } |
| |
| unsigned stream_encoder_evaluate_lpc_subframe_(FLAC__StreamEncoder *encoder, const int32 signal[], int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], const real lp_coeff[], unsigned blocksize, unsigned subframe_bps, unsigned order, unsigned qlp_coeff_precision, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, unsigned rice_parameter_search_dist, FLAC__Subframe *subframe) |
| { |
| int32 qlp_coeff[FLAC__MAX_LPC_ORDER]; |
| unsigned i, residual_bits; |
| int quantization, ret; |
| const unsigned residual_samples = blocksize - order; |
| |
| ret = FLAC__lpc_quantize_coefficients(lp_coeff, order, qlp_coeff_precision, subframe_bps, qlp_coeff, &quantization); |
| if(ret != 0) |
| return 0; /* this is a hack to indicate to the caller that we can't do lp at this order on this subframe */ |
| |
| if(subframe_bps <= 16 && qlp_coeff_precision <= 16) |
| encoder->private->local_lpc_compute_residual_from_qlp_coefficients_16bit(signal+order, residual_samples, qlp_coeff, order, quantization, residual); |
| else |
| encoder->private->local_lpc_compute_residual_from_qlp_coefficients(signal+order, residual_samples, qlp_coeff, order, quantization, residual); |
| |
| subframe->type = FLAC__SUBFRAME_TYPE_LPC; |
| |
| subframe->data.lpc.entropy_coding_method.type = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE; |
| subframe->data.lpc.residual = residual; |
| |
| residual_bits = stream_encoder_find_best_partition_order_(residual, abs_residual, abs_residual_partition_sums, raw_bits_per_partition, residual_samples, order, rice_parameter, min_partition_order, max_partition_order, rice_parameter_search_dist, &subframe->data.lpc.entropy_coding_method.data.partitioned_rice.order, subframe->data.lpc.entropy_coding_method.data.partitioned_rice.parameters, subframe->data.lpc.entropy_coding_method.data.partitioned_rice.raw_bits); |
| |
| subframe->data.lpc.order = order; |
| subframe->data.lpc.qlp_coeff_precision = qlp_coeff_precision; |
| subframe->data.lpc.quantization_level = quantization; |
| memcpy(subframe->data.lpc.qlp_coeff, qlp_coeff, sizeof(int32)*FLAC__MAX_LPC_ORDER); |
| for(i = 0; i < order; i++) |
| subframe->data.lpc.warmup[i] = signal[i]; |
| |
| return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN + FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN + (order * (qlp_coeff_precision + subframe_bps)) + residual_bits; |
| } |
| |
| unsigned stream_encoder_evaluate_verbatim_subframe_(const int32 signal[], unsigned blocksize, unsigned subframe_bps, FLAC__Subframe *subframe) |
| { |
| subframe->type = FLAC__SUBFRAME_TYPE_VERBATIM; |
| |
| subframe->data.verbatim.data = signal; |
| |
| return FLAC__SUBFRAME_ZERO_PAD_LEN + FLAC__SUBFRAME_TYPE_LEN + FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN + (blocksize * subframe_bps); |
| } |
| |
| unsigned stream_encoder_find_best_partition_order_(const int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned rice_parameter, unsigned min_partition_order, unsigned max_partition_order, unsigned rice_parameter_search_dist, unsigned *best_partition_order, unsigned best_parameters[], unsigned best_raw_bits[]) |
| { |
| int32 r; |
| #if (defined FLAC__PRECOMPUTE_PARTITION_SUMS) || (defined FLAC__SEARCH_FOR_ESCAPES) |
| unsigned sum; |
| int partition_order; |
| #else |
| unsigned partition_order; |
| #endif |
| unsigned residual_bits, best_residual_bits = 0; |
| unsigned residual_sample; |
| unsigned best_parameters_index = 0, parameters[2][1 << FLAC__MAX_RICE_PARTITION_ORDER], raw_bits[2][1 << FLAC__MAX_RICE_PARTITION_ORDER]; |
| |
| /* compute abs(residual) for use later */ |
| for(residual_sample = 0; residual_sample < residual_samples; residual_sample++) { |
| r = residual[residual_sample]; |
| abs_residual[residual_sample] = (uint32)(r<0? -r : r); |
| } |
| |
| #if (defined FLAC__PRECOMPUTE_PARTITION_SUMS) || (defined FLAC__SEARCH_FOR_ESCAPES) |
| max_partition_order = stream_encoder_precompute_partition_info_(residual, abs_residual, abs_residual_partition_sums, raw_bits_per_partition, residual_samples, predictor_order, min_partition_order, max_partition_order); |
| min_partition_order = min(min_partition_order, max_partition_order); |
| |
| for(partition_order = (int)max_partition_order, sum = 0; partition_order >= (int)min_partition_order; partition_order--) { |
| if(!stream_encoder_set_partitioned_rice_(abs_residual, abs_residual_partition_sums+sum, raw_bits_per_partition+sum, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, (unsigned)partition_order, parameters[!best_parameters_index], raw_bits[!best_parameters_index], &residual_bits)) { |
| FLAC__ASSERT(0); /* stream_encoder_precompute_partition_info_ should keep this from ever happening */ |
| } |
| sum += 1u << partition_order; |
| if(best_residual_bits == 0 || residual_bits < best_residual_bits) { |
| best_residual_bits = residual_bits; |
| *best_partition_order = partition_order; |
| best_parameters_index = !best_parameters_index; |
| } |
| } |
| #else |
| for(partition_order = min_partition_order; partition_order <= max_partition_order; partition_order++) { |
| if(!stream_encoder_set_partitioned_rice_(abs_residual, 0, 0, residual_samples, predictor_order, rice_parameter, rice_parameter_search_dist, partition_order, parameters[!best_parameters_index], raw_bits[!best_parameters_index], &residual_bits)) { |
| FLAC__ASSERT(best_residual_bits != 0); |
| break; |
| } |
| if(best_residual_bits == 0 || residual_bits < best_residual_bits) { |
| best_residual_bits = residual_bits; |
| *best_partition_order = partition_order; |
| best_parameters_index = !best_parameters_index; |
| } |
| } |
| #endif |
| memcpy(best_parameters, parameters[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order))); |
| memcpy(best_raw_bits, raw_bits[best_parameters_index], sizeof(unsigned)*(1<<(*best_partition_order))); |
| |
| return best_residual_bits; |
| } |
| |
| #if (defined FLAC__PRECOMPUTE_PARTITION_SUMS) || (defined FLAC__SEARCH_FOR_ESCAPES) |
| unsigned stream_encoder_precompute_partition_info_(const int32 residual[], uint32 abs_residual[], uint32 abs_residual_partition_sums[], unsigned raw_bits_per_partition[], unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order) |
| { |
| int partition_order; |
| unsigned from_partition, to_partition = 0; |
| const unsigned blocksize = residual_samples + predictor_order; |
| |
| /* first do max_partition_order */ |
| for(partition_order = (int)max_partition_order; partition_order >= 0; partition_order--) { |
| #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS |
| uint32 abs_residual_partition_sum; |
| #endif |
| #ifdef FLAC__SEARCH_FOR_ESCAPES |
| uint32 abs_residual_partition_max; |
| unsigned abs_residual_partition_max_index = 0; /* initialized to silence superfluous compiler warning */ |
| #endif |
| uint32 abs_r; |
| unsigned partition, partition_sample, partition_samples, residual_sample; |
| const unsigned partitions = 1u << partition_order; |
| const unsigned default_partition_samples = blocksize >> partition_order; |
| |
| if(default_partition_samples <= predictor_order) { |
| FLAC__ASSERT(max_partition_order > 0); |
| max_partition_order--; |
| } |
| else { |
| for(partition = residual_sample = 0; partition < partitions; partition++) { |
| partition_samples = default_partition_samples; |
| if(partition == 0) |
| partition_samples -= predictor_order; |
| #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS |
| abs_residual_partition_sum = 0; |
| #endif |
| #ifdef FLAC__SEARCH_FOR_ESCAPES |
| abs_residual_partition_max = 0; |
| #endif |
| for(partition_sample = 0; partition_sample < partition_samples; partition_sample++) { |
| abs_r = abs_residual[residual_sample]; |
| #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS |
| abs_residual_partition_sum += abs_r; /* @@@ this can overflow with small max_partition_order and (large blocksizes or bits-per-sample), FIX! */ |
| #endif |
| #ifdef FLAC__SEARCH_FOR_ESCAPES |
| if(abs_r > abs_residual_partition_max) { |
| abs_residual_partition_max = abs_r; |
| abs_residual_partition_max_index = residual_sample; |
| } |
| #endif |
| residual_sample++; |
| } |
| #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS |
| abs_residual_partition_sums[partition] = abs_residual_partition_sum; |
| #endif |
| #ifdef FLAC__SEARCH_FOR_ESCAPES |
| if(abs_residual_partition_max > 0) |
| raw_bits_per_partition[partition] = FLAC__bitmath_silog2(residual[abs_residual_partition_max_index]); |
| else |
| raw_bits_per_partition[partition] = FLAC__bitmath_silog2(0); |
| #endif |
| } |
| to_partition = partitions; |
| break; |
| } |
| } |
| |
| /* now merge for lower orders */ |
| for(from_partition = 0, --partition_order; partition_order >= (int)min_partition_order; partition_order--) { |
| #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS |
| uint32 s; |
| #endif |
| #ifdef FLAC__SEARCH_FOR_ESCAPES |
| unsigned m; |
| #endif |
| unsigned i; |
| const unsigned partitions = 1u << partition_order; |
| for(i = 0; i < partitions; i++) { |
| #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS |
| s = abs_residual_partition_sums[from_partition]; |
| #endif |
| #ifdef FLAC__SEARCH_FOR_ESCAPES |
| m = raw_bits_per_partition[from_partition]; |
| #endif |
| from_partition++; |
| #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS |
| abs_residual_partition_sums[to_partition] = s + abs_residual_partition_sums[from_partition]; |
| #endif |
| #ifdef FLAC__SEARCH_FOR_ESCAPES |
| raw_bits_per_partition[to_partition] = max(m, raw_bits_per_partition[from_partition]); |
| #endif |
| from_partition++; |
| to_partition++; |
| } |
| } |
| |
| return max_partition_order; |
| } |
| #endif |
| |
| #ifdef VARIABLE_RICE_BITS |
| #undef VARIABLE_RICE_BITS |
| #endif |
| #define VARIABLE_RICE_BITS(value, parameter) ((value) >> (parameter)) |
| |
| bool stream_encoder_set_partitioned_rice_(const uint32 abs_residual[], const uint32 abs_residual_partition_sums[], const unsigned raw_bits_per_partition[], const unsigned residual_samples, const unsigned predictor_order, const unsigned suggested_rice_parameter, const unsigned rice_parameter_search_dist, const unsigned partition_order, unsigned parameters[], unsigned raw_bits[], unsigned *bits) |
| { |
| unsigned rice_parameter, partition_bits; |
| #ifndef NO_RICE_SEARCH |
| unsigned best_partition_bits; |
| unsigned min_rice_parameter, max_rice_parameter, best_rice_parameter = 0; |
| #endif |
| #ifdef FLAC__SEARCH_FOR_ESCAPES |
| unsigned flat_bits; |
| #endif |
| unsigned bits_ = FLAC__ENTROPY_CODING_METHOD_TYPE_LEN + FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN; |
| |
| FLAC__ASSERT(suggested_rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER); |
| |
| if(partition_order == 0) { |
| unsigned i; |
| |
| #ifndef NO_RICE_SEARCH |
| if(rice_parameter_search_dist) { |
| if(suggested_rice_parameter < rice_parameter_search_dist) |
| min_rice_parameter = 0; |
| else |
| min_rice_parameter = suggested_rice_parameter - rice_parameter_search_dist; |
| max_rice_parameter = suggested_rice_parameter + rice_parameter_search_dist; |
| if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) |
| max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1; |
| } |
| else |
| min_rice_parameter = max_rice_parameter = suggested_rice_parameter; |
| |
| best_partition_bits = 0xffffffff; |
| for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) { |
| #endif |
| #ifdef VARIABLE_RICE_BITS |
| #ifdef FLAC__SYMMETRIC_RICE |
| partition_bits = (2+rice_parameter) * residual_samples; |
| #else |
| const unsigned rice_parameter_estimate = rice_parameter-1; |
| partition_bits = (1+rice_parameter) * residual_samples; |
| #endif |
| #else |
| partition_bits = 0; |
| #endif |
| partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; |
| for(i = 0; i < residual_samples; i++) { |
| #ifdef VARIABLE_RICE_BITS |
| #ifdef FLAC__SYMMETRIC_RICE |
| partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter); |
| #else |
| partition_bits += VARIABLE_RICE_BITS(abs_residual[i], rice_parameter_estimate); |
| #endif |
| #else |
| partition_bits += FLAC__bitbuffer_rice_bits(residual[i], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */ |
| #endif |
| } |
| #ifndef NO_RICE_SEARCH |
| if(partition_bits < best_partition_bits) { |
| best_rice_parameter = rice_parameter; |
| best_partition_bits = partition_bits; |
| } |
| } |
| #endif |
| #ifdef FLAC__SEARCH_FOR_ESCAPES |
| flat_bits = raw_bits_per_partition[0] * residual_samples; |
| if(flat_bits <= best_partition_bits) { |
| raw_bits[0] = raw_bits_per_partition[0]; |
| best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER; |
| best_partition_bits = flat_bits; |
| } |
| #endif |
| parameters[0] = best_rice_parameter; |
| bits_ += best_partition_bits; |
| } |
| else { |
| unsigned partition, residual_sample, save_residual_sample, partition_sample; |
| unsigned mean, partition_samples; |
| const unsigned partitions = 1u << partition_order; |
| for(partition = residual_sample = 0; partition < partitions; partition++) { |
| partition_samples = (residual_samples+predictor_order) >> partition_order; |
| if(partition == 0) { |
| if(partition_samples <= predictor_order) |
| return false; |
| else |
| partition_samples -= predictor_order; |
| } |
| mean = partition_samples >> 1; |
| #ifdef FLAC__PRECOMPUTE_PARTITION_SUMS |
| mean += abs_residual_partition_sums[partition]; |
| #else |
| save_residual_sample = residual_sample; |
| for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++) |
| mean += abs_residual[residual_sample]; |
| residual_sample = save_residual_sample; |
| #endif |
| mean /= partition_samples; |
| #ifdef FLAC__SYMMETRIC_RICE |
| /* calc rice_parameter = floor(log2(mean)) */ |
| rice_parameter = 0; |
| mean>>=1; |
| while(mean) { |
| rice_parameter++; |
| mean >>= 1; |
| } |
| #else |
| /* calc rice_parameter = floor(log2(mean)) + 1 */ |
| rice_parameter = 0; |
| while(mean) { |
| rice_parameter++; |
| mean >>= 1; |
| } |
| #endif |
| if(rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) |
| rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1; |
| |
| #ifndef NO_RICE_SEARCH |
| if(rice_parameter_search_dist) { |
| if(rice_parameter < rice_parameter_search_dist) |
| min_rice_parameter = 0; |
| else |
| min_rice_parameter = rice_parameter - rice_parameter_search_dist; |
| max_rice_parameter = rice_parameter + rice_parameter_search_dist; |
| if(max_rice_parameter >= FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) |
| max_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER - 1; |
| } |
| else |
| min_rice_parameter = max_rice_parameter = rice_parameter; |
| |
| best_partition_bits = 0xffffffff; |
| for(rice_parameter = min_rice_parameter; rice_parameter <= max_rice_parameter; rice_parameter++) { |
| #endif |
| #ifdef VARIABLE_RICE_BITS |
| #ifdef FLAC__SYMMETRIC_RICE |
| partition_bits = (2+rice_parameter) * partition_samples; |
| #else |
| const unsigned rice_parameter_estimate = rice_parameter-1; |
| partition_bits = (1+rice_parameter) * partition_samples; |
| #endif |
| #else |
| partition_bits = 0; |
| #endif |
| partition_bits += FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; |
| save_residual_sample = residual_sample; |
| for(partition_sample = 0; partition_sample < partition_samples; residual_sample++, partition_sample++) { |
| #ifdef VARIABLE_RICE_BITS |
| #ifdef FLAC__SYMMETRIC_RICE |
| partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter); |
| #else |
| partition_bits += VARIABLE_RICE_BITS(abs_residual[residual_sample], rice_parameter_estimate); |
| #endif |
| #else |
| partition_bits += FLAC__bitbuffer_rice_bits(residual[residual_sample], rice_parameter); /* NOTE: we will need to pass in residual[] instead of abs_residual[] */ |
| #endif |
| } |
| #ifndef NO_RICE_SEARCH |
| if(rice_parameter != max_rice_parameter) |
| residual_sample = save_residual_sample; |
| if(partition_bits < best_partition_bits) { |
| best_rice_parameter = rice_parameter; |
| best_partition_bits = partition_bits; |
| } |
| } |
| #endif |
| #ifdef FLAC__SEARCH_FOR_ESCAPES |
| flat_bits = raw_bits_per_partition[partition] * partition_samples; |
| if(flat_bits <= best_partition_bits) { |
| raw_bits[partition] = raw_bits_per_partition[partition]; |
| best_rice_parameter = FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER; |
| best_partition_bits = flat_bits; |
| } |
| #endif |
| parameters[partition] = best_rice_parameter; |
| bits_ += best_partition_bits; |
| } |
| } |
| |
| *bits = bits_; |
| return true; |
| } |
| |
| unsigned stream_encoder_get_wasted_bits_(int32 signal[], unsigned samples) |
| { |
| unsigned i, shift; |
| int32 x = 0; |
| |
| for(i = 0; i < samples && !(x&1); i++) |
| x |= signal[i]; |
| |
| if(x == 0) { |
| shift = 0; |
| } |
| else { |
| for(shift = 0; !(x&1); shift++) |
| x >>= 1; |
| } |
| |
| if(shift > 0) { |
| for(i = 0; i < samples; i++) |
| signal[i] >>= shift; |
| } |
| |
| return shift; |
| } |
| |