| /* Copyright (c) 2010 Xiph.Org Foundation, Skype Limited |
| Written by Jean-Marc Valin and Koen Vos */ |
| /* |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| |
| - Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| |
| - Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <string.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <stdarg.h> |
| #include "celt.h" |
| #include "opus_decoder.h" |
| #include "entdec.h" |
| #include "modes.h" |
| #include "silk_API.h" |
| #include "stack_alloc.h" |
| #include "float_cast.h" |
| |
| #ifdef FIXED_POINT |
| #define celt_decode_native celt_decode |
| #else |
| #define celt_decode_native celt_decode_float |
| #endif |
| |
| /* Make sure everything's aligned to 4 bytes (this may need to be increased |
| on really weird architectures) */ |
| static inline int align(int i) |
| { |
| return (i+3)&-4; |
| } |
| |
| int opus_decoder_get_size(int channels) |
| { |
| int silkDecSizeBytes, celtDecSizeBytes; |
| int ret; |
| ret = silk_Get_Decoder_Size( &silkDecSizeBytes ); |
| if(ret) |
| return 0; |
| silkDecSizeBytes = align(silkDecSizeBytes); |
| celtDecSizeBytes = celt_decoder_get_size(channels); |
| return align(sizeof(OpusDecoder))+silkDecSizeBytes+celtDecSizeBytes; |
| |
| } |
| |
| OpusDecoder *opus_decoder_init(OpusDecoder *st, int Fs, int channels) |
| { |
| void *silk_dec; |
| CELTDecoder *celt_dec; |
| int ret, silkDecSizeBytes; |
| |
| if (channels<1 || channels > 2) |
| return NULL; |
| memset(st, 0, opus_decoder_get_size(channels)); |
| /* Initialize SILK encoder */ |
| ret = silk_Get_Decoder_Size( &silkDecSizeBytes ); |
| if( ret ) { |
| return NULL; |
| } |
| silkDecSizeBytes = align(silkDecSizeBytes); |
| st->silk_dec_offset = align(sizeof(OpusDecoder)); |
| st->celt_dec_offset = st->silk_dec_offset+silkDecSizeBytes; |
| silk_dec = (char*)st+st->silk_dec_offset; |
| celt_dec = (CELTDecoder*)((char*)st+st->celt_dec_offset); |
| st->stream_channels = st->channels = channels; |
| |
| st->Fs = Fs; |
| |
| /* Reset decoder */ |
| ret = silk_InitDecoder( silk_dec ); |
| if( ret ) { |
| goto failure; |
| } |
| |
| /* Initialize CELT decoder */ |
| celt_decoder_init(celt_dec, Fs, channels, &ret); |
| if (ret != CELT_OK) |
| goto failure; |
| celt_decoder_ctl(celt_dec, CELT_SET_SIGNALLING(0)); |
| |
| st->prev_mode = 0; |
| st->frame_size = Fs/400; |
| return st; |
| failure: |
| free(st); |
| return NULL; |
| } |
| |
| OpusDecoder *opus_decoder_create(int Fs, int channels) |
| { |
| char *raw_state = (char*)malloc(opus_decoder_get_size(channels)); |
| if (raw_state == NULL) |
| return NULL; |
| return opus_decoder_init((OpusDecoder*)raw_state, Fs, channels); |
| } |
| |
| static void smooth_fade(const opus_val16 *in1, const opus_val16 *in2, opus_val16 *out, |
| int overlap, int channels, const opus_val16 *window, int Fs) |
| { |
| int i, c; |
| int inc = 48000/Fs; |
| for (c=0;c<channels;c++) |
| { |
| for (i=0;i<overlap;i++) |
| { |
| opus_val16 w = MULT16_16_Q15(window[i*inc], window[i*inc]); |
| out[i*channels+c] = SHR32(MAC16_16(MULT16_16(w,in2[i*channels+c]), |
| Q15ONE-w, in1[i*channels+c]), 15); |
| } |
| } |
| } |
| |
| static int opus_packet_get_mode(const unsigned char *data) |
| { |
| int mode; |
| if (data[0]&0x80) |
| { |
| mode = MODE_CELT_ONLY; |
| } else if ((data[0]&0x60) == 0x60) |
| { |
| mode = MODE_HYBRID; |
| } else { |
| |
| mode = MODE_SILK_ONLY; |
| } |
| return mode; |
| } |
| |
| static int opus_decode_frame(OpusDecoder *st, const unsigned char *data, |
| int len, opus_val16 *pcm, int frame_size, int decode_fec) |
| { |
| void *silk_dec; |
| CELTDecoder *celt_dec; |
| int i, silk_ret=0, celt_ret=0; |
| ec_dec dec; |
| silk_DecControlStruct DecControl; |
| opus_int32 silk_frame_size; |
| VARDECL(opus_int16, pcm_silk); |
| VARDECL(opus_val16, pcm_transition); |
| |
| int audiosize; |
| int mode; |
| int transition=0; |
| int start_band; |
| int redundancy=0; |
| int redundancy_bytes = 0; |
| int celt_to_silk=0; |
| int c; |
| int F2_5, F5, F10, F20; |
| const opus_val16 *window; |
| ALLOC_STACK; |
| |
| silk_dec = (char*)st+st->silk_dec_offset; |
| celt_dec = (CELTDecoder*)((char*)st+st->celt_dec_offset); |
| F20 = st->Fs/50; |
| F10 = F20>>1; |
| F5 = F10>>1; |
| F2_5 = F5>>1; |
| if (frame_size < F2_5) |
| return OPUS_BUFFER_TOO_SMALL; |
| /* Payloads of 1 (2 including ToC) or 0 trigger the PLC/DTX */ |
| if (len<=1) |
| { |
| data = NULL; |
| /* In that case, don't conceal more than what the ToC says */ |
| /* FIXME: What if st->frame_size has never been set? */ |
| frame_size = IMIN(frame_size, st->frame_size); |
| } |
| if (data != NULL) |
| { |
| audiosize = st->frame_size; |
| mode = st->mode; |
| ec_dec_init(&dec,(unsigned char*)data,len); |
| } else { |
| audiosize = frame_size; |
| |
| if (st->prev_mode == 0) |
| { |
| /* If we haven't got any packet yet, all we can do is return zeros */ |
| for (i=0;i<audiosize*st->channels;i++) |
| pcm[i] = 0; |
| RESTORE_STACK; |
| return audiosize; |
| } else { |
| mode = st->prev_mode; |
| } |
| } |
| |
| ALLOC(pcm_transition, F5*st->channels, opus_val16); |
| |
| if (data!=NULL && !st->prev_redundancy && mode != st->prev_mode && st->prev_mode > 0 |
| && !(mode == MODE_SILK_ONLY && st->prev_mode == MODE_HYBRID) |
| && !(mode == MODE_HYBRID && st->prev_mode == MODE_SILK_ONLY)) |
| { |
| transition = 1; |
| if (mode == MODE_CELT_ONLY) |
| opus_decode_frame(st, NULL, 0, pcm_transition, IMIN(F5, audiosize), 0); |
| } |
| if (audiosize > frame_size) |
| { |
| fprintf(stderr, "PCM buffer too small: %d vs %d (mode = %d)\n", audiosize, frame_size, mode); |
| RESTORE_STACK; |
| return OPUS_BAD_ARG; |
| } else { |
| frame_size = audiosize; |
| } |
| |
| ALLOC(pcm_silk, frame_size*st->channels, opus_int16); |
| ALLOC(redundant_audio, F5*st->channels, opus_val16); |
| |
| /* SILK processing */ |
| if (mode != MODE_CELT_ONLY) |
| { |
| int lost_flag, decoded_samples; |
| opus_int16 *pcm_ptr = pcm_silk; |
| |
| if (st->prev_mode==MODE_CELT_ONLY) |
| silk_InitDecoder( silk_dec ); |
| |
| DecControl.API_sampleRate = st->Fs; |
| DecControl.nChannelsAPI = st->channels; |
| DecControl.nChannelsInternal = st->stream_channels; |
| DecControl.payloadSize_ms = 1000 * audiosize / st->Fs; |
| if( mode == MODE_SILK_ONLY ) { |
| if( st->bandwidth == OPUS_BANDWIDTH_NARROWBAND ) { |
| DecControl.internalSampleRate = 8000; |
| } else if( st->bandwidth == OPUS_BANDWIDTH_MEDIUMBAND ) { |
| DecControl.internalSampleRate = 12000; |
| } else if( st->bandwidth == OPUS_BANDWIDTH_WIDEBAND ) { |
| DecControl.internalSampleRate = 16000; |
| } else { |
| DecControl.internalSampleRate = 16000; |
| SKP_assert( 0 ); |
| } |
| } else { |
| /* Hybrid mode */ |
| DecControl.internalSampleRate = 16000; |
| } |
| |
| lost_flag = data == NULL ? 1 : 2 * decode_fec; |
| decoded_samples = 0; |
| do { |
| /* Call SILK decoder */ |
| int first_frame = decoded_samples == 0; |
| silk_ret = silk_Decode( silk_dec, &DecControl, |
| lost_flag, first_frame, &dec, pcm_ptr, &silk_frame_size ); |
| if( silk_ret ) { |
| if (lost_flag) { |
| /* PLC failure should not be fatal */ |
| silk_frame_size = frame_size; |
| for (i=0;i<frame_size*st->channels;i++) |
| pcm_ptr[i] = 0; |
| } else { |
| RESTORE_STACK; |
| return OPUS_CORRUPTED_DATA; |
| } |
| } |
| pcm_ptr += silk_frame_size * st->channels; |
| decoded_samples += silk_frame_size; |
| } while( decoded_samples < frame_size ); |
| } |
| |
| start_band = 0; |
| if (mode != MODE_CELT_ONLY && data != NULL) |
| { |
| /* Check if we have a redundant 0-8 kHz band */ |
| redundancy = ec_dec_bit_logp(&dec, 12); |
| if (redundancy) |
| { |
| celt_to_silk = ec_dec_bit_logp(&dec, 1); |
| if (mode == MODE_HYBRID) |
| redundancy_bytes = 2 + ec_dec_uint(&dec, 256); |
| else { |
| redundancy_bytes = len - ((ec_tell(&dec)+7)>>3); |
| /* Can only happen on an invalid packet */ |
| if (redundancy_bytes<0) |
| { |
| redundancy_bytes = 0; |
| redundancy = 0; |
| } |
| } |
| len -= redundancy_bytes; |
| if (len<0) { |
| RESTORE_STACK; |
| return OPUS_CORRUPTED_DATA; |
| } |
| /* Shrink decoder because of raw bits */ |
| dec.storage -= redundancy_bytes; |
| } |
| } |
| if (mode != MODE_CELT_ONLY) |
| start_band = 17; |
| |
| { |
| int endband=21; |
| |
| switch(st->bandwidth) |
| { |
| case OPUS_BANDWIDTH_NARROWBAND: |
| endband = 13; |
| break; |
| case OPUS_BANDWIDTH_MEDIUMBAND: |
| case OPUS_BANDWIDTH_WIDEBAND: |
| endband = 17; |
| break; |
| case OPUS_BANDWIDTH_SUPERWIDEBAND: |
| endband = 19; |
| break; |
| case OPUS_BANDWIDTH_FULLBAND: |
| endband = 21; |
| break; |
| } |
| celt_decoder_ctl(celt_dec, CELT_SET_END_BAND(endband)); |
| celt_decoder_ctl(celt_dec, CELT_SET_CHANNELS(st->stream_channels)); |
| } |
| |
| if (redundancy) |
| transition = 0; |
| |
| if (transition && mode != MODE_CELT_ONLY) |
| opus_decode_frame(st, NULL, 0, pcm_transition, IMIN(F5, audiosize), 0); |
| |
| /* 5 ms redundant frame for CELT->SILK*/ |
| if (redundancy && celt_to_silk) |
| { |
| celt_decoder_ctl(celt_dec, CELT_SET_START_BAND(0)); |
| celt_decode_native(celt_dec, data+len, redundancy_bytes, redundant_audio, F5); |
| celt_decoder_ctl(celt_dec, CELT_RESET_STATE); |
| } |
| |
| /* MUST be after PLC */ |
| celt_decoder_ctl(celt_dec, CELT_SET_START_BAND(start_band)); |
| |
| if (transition) |
| celt_decoder_ctl(celt_dec, CELT_RESET_STATE); |
| |
| if (mode != MODE_SILK_ONLY) |
| { |
| int celt_frame_size = IMIN(F20, frame_size); |
| /* Decode CELT */ |
| celt_ret = celt_decode_with_ec(celt_dec, decode_fec?NULL:data, len, pcm, celt_frame_size, &dec); |
| } else { |
| for (i=0;i<frame_size*st->channels;i++) |
| pcm[i] = 0; |
| } |
| |
| if (mode != MODE_CELT_ONLY) |
| { |
| #ifdef FIXED_POINT |
| for (i=0;i<frame_size*st->channels;i++) |
| pcm[i] = SAT16(pcm[i] + pcm_silk[i]); |
| #else |
| for (i=0;i<frame_size*st->channels;i++) |
| pcm[i] = pcm[i] + (1./32768.)*pcm_silk[i]; |
| #endif |
| } |
| |
| { |
| const CELTMode *celt_mode; |
| celt_decoder_ctl(celt_dec, CELT_GET_MODE(&celt_mode)); |
| window = celt_mode->window; |
| } |
| |
| /* 5 ms redundant frame for SILK->CELT */ |
| if (redundancy && !celt_to_silk) |
| { |
| celt_decoder_ctl(celt_dec, CELT_RESET_STATE); |
| celt_decoder_ctl(celt_dec, CELT_SET_START_BAND(0)); |
| |
| celt_decode_native(celt_dec, data+len, redundancy_bytes, redundant_audio, F5); |
| smooth_fade(pcm+st->channels*(frame_size-F2_5), redundant_audio+st->channels*F2_5, |
| pcm+st->channels*(frame_size-F2_5), F2_5, st->channels, window, st->Fs); |
| } |
| if (redundancy && celt_to_silk) |
| { |
| for (c=0;c<st->channels;c++) |
| { |
| for (i=0;i<F2_5;i++) |
| pcm[st->channels*i+c] = redundant_audio[st->channels*i+c]; |
| } |
| smooth_fade(redundant_audio+st->channels*F2_5, pcm+st->channels*F2_5, |
| pcm+st->channels*F2_5, F2_5, st->channels, window, st->Fs); |
| } |
| if (transition) |
| { |
| for (i=0;i<st->channels*F2_5;i++) |
| pcm[i] = pcm_transition[i]; |
| if (audiosize >= F5) |
| smooth_fade(pcm_transition+st->channels*F2_5, pcm+st->channels*F2_5, |
| pcm+st->channels*F2_5, F2_5, |
| st->channels, window, st->Fs); |
| } |
| |
| st->rangeFinal = dec.rng; |
| |
| st->prev_mode = mode; |
| st->prev_redundancy = redundancy; |
| RESTORE_STACK; |
| return celt_ret<0 ? celt_ret : audiosize; |
| |
| } |
| |
| static int parse_size(const unsigned char *data, int len, short *size) |
| { |
| if (len<1) |
| { |
| *size = -1; |
| return -1; |
| } else if (data[0]<252) |
| { |
| *size = data[0]; |
| return 1; |
| } else if (len<2) |
| { |
| *size = -1; |
| return -1; |
| } else { |
| *size = 4*data[1] + data[0]; |
| return 2; |
| } |
| } |
| |
| int opus_packet_parse(const unsigned char *data, int len, |
| unsigned char *out_toc, const unsigned char *frames[48], |
| short size[48], const unsigned char **payload) |
| { |
| int i, bytes; |
| int count; |
| unsigned char ch, toc; |
| int framesize; |
| |
| if (size==NULL) |
| return OPUS_BAD_ARG; |
| |
| framesize = opus_packet_get_samples_per_frame(data, 48000); |
| |
| toc = *data++; |
| len--; |
| switch (toc&0x3) |
| { |
| /* One frame */ |
| case 0: |
| count=1; |
| size[0] = len; |
| break; |
| /* Two CBR frames */ |
| case 1: |
| count=2; |
| if (len&0x1) |
| return OPUS_CORRUPTED_DATA; |
| size[0] = size[1] = len/2; |
| break; |
| /* Two VBR frames */ |
| case 2: |
| count = 2; |
| bytes = parse_size(data, len, size); |
| len -= bytes; |
| if (size[0]<0 || size[0] > len) |
| return OPUS_CORRUPTED_DATA; |
| data += bytes; |
| size[1] = len-size[0]; |
| break; |
| /* Multiple CBR/VBR frames (from 0 to 120 ms) */ |
| case 3: |
| if (len<1) |
| return OPUS_CORRUPTED_DATA; |
| /* Number of frames encoded in bits 0 to 5 */ |
| ch = *data++; |
| count = ch&0x3F; |
| if (count <= 0 || framesize*count > 5760) |
| return OPUS_CORRUPTED_DATA; |
| len--; |
| /* Padding flag is bit 6 */ |
| if (ch&0x40) |
| { |
| int padding=0; |
| int p; |
| do { |
| if (len<=0) |
| return OPUS_CORRUPTED_DATA; |
| p = *data++; |
| len--; |
| padding += p==255 ? 254: p; |
| } while (p==255); |
| len -= padding; |
| } |
| if (len<0) |
| return OPUS_CORRUPTED_DATA; |
| /* VBR flag is bit 7 */ |
| if (ch&0x80) |
| { |
| /* VBR case */ |
| int last_size=len; |
| for (i=0;i<count-1;i++) |
| { |
| bytes = parse_size(data, len, size+i); |
| len -= bytes; |
| if (size[i]<0 || size[i] > len) |
| return OPUS_CORRUPTED_DATA; |
| data += bytes; |
| last_size -= bytes+size[i]; |
| } |
| if (last_size<0) |
| return OPUS_CORRUPTED_DATA; |
| size[count-1]=last_size; |
| } else { |
| /* CBR case */ |
| int sz = len/count; |
| if (sz*count!=len) |
| return OPUS_CORRUPTED_DATA; |
| for (i=0;i<count;i++) |
| size[i] = sz; |
| } |
| break; |
| } |
| /* Because it's not encoded explicitly, it's possible the size of the |
| last packet (or all the packets, for the CBR case) is larger than |
| 1275. |
| Reject them here.*/ |
| if (size[count-1] > 1275) |
| return OPUS_CORRUPTED_DATA; |
| |
| if (frames) |
| { |
| for (i=0;i<count;i++) |
| { |
| frames[i] = data; |
| data += size[i]; |
| } |
| } |
| |
| if (out_toc) |
| *out_toc = toc; |
| |
| if (payload) |
| *payload = data; |
| |
| return count; |
| } |
| |
| #ifdef FIXED_POINT |
| int opus_decode(OpusDecoder *st, const unsigned char *data, |
| int len, opus_val16 *pcm, int frame_size, int decode_fec) |
| #else |
| int opus_decode_float(OpusDecoder *st, const unsigned char *data, |
| int len, opus_val16 *pcm, int frame_size, int decode_fec) |
| #endif |
| { |
| int i, nb_samples; |
| int count; |
| unsigned char toc; |
| /* 48 x 2.5 ms = 120 ms */ |
| short size[48]; |
| if (len==0 || data==NULL) |
| return opus_decode_frame(st, NULL, 0, pcm, frame_size, 0); |
| else if (len<0) |
| return OPUS_BAD_ARG; |
| st->mode = opus_packet_get_mode(data); |
| st->bandwidth = opus_packet_get_bandwidth(data); |
| st->frame_size = opus_packet_get_samples_per_frame(data, st->Fs); |
| st->stream_channels = opus_packet_get_nb_channels(data); |
| |
| count = opus_packet_parse(data, len, &toc, NULL, size, &data); |
| if (count < 0) |
| return count; |
| |
| if (count*st->frame_size > frame_size) |
| return OPUS_BAD_ARG; |
| nb_samples=0; |
| for (i=0;i<count;i++) |
| { |
| int ret; |
| ret = opus_decode_frame(st, data, size[i], pcm, frame_size-nb_samples, decode_fec); |
| if (ret<0) |
| return ret; |
| data += size[i]; |
| pcm += ret*st->channels; |
| nb_samples += ret; |
| } |
| return nb_samples; |
| } |
| |
| #ifdef FIXED_POINT |
| |
| #ifndef DISABLE_FLOAT_API |
| int opus_decode_float(OpusDecoder *st, const unsigned char *data, |
| int len, float *pcm, int frame_size, int decode_fec) |
| { |
| VARDECL(opus_int16, out); |
| int ret, i; |
| ALLOC_STACK; |
| |
| ALLOC(out, frame_size*st->channels, opus_int16); |
| |
| ret = opus_decode(st, data, len, out, frame_size, decode_fec); |
| if (ret > 0) |
| { |
| for (i=0;i<ret*st->channels;i++) |
| pcm[i] = (1./32768.)*(out[i]); |
| } |
| RESTORE_STACK; |
| return ret; |
| } |
| #endif |
| |
| #else |
| int opus_decode(OpusDecoder *st, const unsigned char *data, |
| int len, opus_int16 *pcm, int frame_size, int decode_fec) |
| { |
| VARDECL(float, out); |
| int ret, i; |
| ALLOC_STACK; |
| |
| ALLOC(out, frame_size*st->channels, float); |
| |
| ret = opus_decode_float(st, data, len, out, frame_size, decode_fec); |
| if (ret > 0) |
| { |
| for (i=0;i<ret*st->channels;i++) |
| pcm[i] = FLOAT2INT16(out[i]); |
| } |
| RESTORE_STACK; |
| return ret; |
| } |
| #endif |
| |
| int opus_decoder_ctl(OpusDecoder *st, int request, ...) |
| { |
| va_list ap; |
| |
| va_start(ap, request); |
| |
| switch (request) |
| { |
| case OPUS_GET_MODE_REQUEST: |
| { |
| int *value = va_arg(ap, int*); |
| *value = st->prev_mode; |
| } |
| break; |
| case OPUS_SET_BANDWIDTH_REQUEST: |
| { |
| int value = va_arg(ap, int); |
| st->bandwidth = value; |
| } |
| break; |
| case OPUS_GET_BANDWIDTH_REQUEST: |
| { |
| int *value = va_arg(ap, int*); |
| *value = st->bandwidth; |
| } |
| break; |
| default: |
| fprintf(stderr, "unknown opus_decoder_ctl() request: %d", request); |
| break; |
| } |
| |
| va_end(ap); |
| return OPUS_OK; |
| } |
| |
| void opus_decoder_destroy(OpusDecoder *st) |
| { |
| free(st); |
| } |
| |
| int opus_decoder_get_final_range(OpusDecoder *st) |
| { |
| return st->rangeFinal; |
| } |
| |
| int opus_packet_get_bandwidth(const unsigned char *data) |
| { |
| int bandwidth; |
| if (data[0]&0x80) |
| { |
| bandwidth = OPUS_BANDWIDTH_MEDIUMBAND + ((data[0]>>5)&0x3); |
| if (bandwidth == OPUS_BANDWIDTH_MEDIUMBAND) |
| bandwidth = OPUS_BANDWIDTH_NARROWBAND; |
| } else if ((data[0]&0x60) == 0x60) |
| { |
| bandwidth = (data[0]&0x10) ? OPUS_BANDWIDTH_FULLBAND : OPUS_BANDWIDTH_SUPERWIDEBAND; |
| } else { |
| |
| bandwidth = OPUS_BANDWIDTH_NARROWBAND + ((data[0]>>5)&0x3); |
| } |
| return bandwidth; |
| } |
| |
| int opus_packet_get_samples_per_frame(const unsigned char *data, int Fs) |
| { |
| int audiosize; |
| if (data[0]&0x80) |
| { |
| audiosize = ((data[0]>>3)&0x3); |
| audiosize = (Fs<<audiosize)/400; |
| } else if ((data[0]&0x60) == 0x60) |
| { |
| audiosize = (data[0]&0x08) ? Fs/50 : Fs/100; |
| } else { |
| |
| audiosize = ((data[0]>>3)&0x3); |
| if (audiosize == 3) |
| audiosize = Fs*60/1000; |
| else |
| audiosize = (Fs<<audiosize)/100; |
| } |
| return audiosize; |
| } |
| |
| int opus_packet_get_nb_channels(const unsigned char *data) |
| { |
| return (data[0]&0x4) ? 2 : 1; |
| } |
| |
| int opus_packet_get_nb_frames(const unsigned char packet[], int len) |
| { |
| int count; |
| if (len<1) |
| return OPUS_BAD_ARG; |
| count = packet[0]&0x3; |
| if (count==0) |
| return 1; |
| else if (count!=3) |
| return 2; |
| else if (len<2) |
| return OPUS_CORRUPTED_DATA; |
| else |
| return packet[1]&0x3F; |
| } |
| |
| int opus_decoder_get_nb_samples(const OpusDecoder *dec, const unsigned char packet[], int len) |
| { |
| int samples; |
| int count = opus_packet_get_nb_frames(packet, len); |
| samples = count*opus_packet_get_samples_per_frame(packet, dec->Fs); |
| /* Can't have more than 120 ms */ |
| if (samples*25 > dec->Fs*3) |
| return OPUS_CORRUPTED_DATA; |
| else |
| return samples; |
| } |
| |