| /* libOggFLAC - Free Lossless Audio Codec + Ogg library |
| * Copyright (C) 2002,2003,2004,2005 Josh Coalson |
| * |
| * 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. |
| * |
| * - Neither the name of the Xiph.org Foundation nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * 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. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> /* for calloc() */ |
| #include <string.h> /* for memcpy()/memcmp() */ |
| #include "FLAC/assert.h" |
| #include "protected/seekable_stream_decoder.h" |
| #include "protected/stream_decoder.h" |
| #include "../libFLAC/include/private/float.h" /* @@@ ugly hack, but how else to do? we need to reuse the float formats but don't want to expose it */ |
| #include "../libFLAC/include/private/md5.h" /* @@@ ugly hack, but how else to do? we need to reuse the md5 code but don't want to expose it */ |
| |
| /*********************************************************************** |
| * |
| * Private class method prototypes |
| * |
| ***********************************************************************/ |
| |
| static void set_defaults_(OggFLAC__SeekableStreamDecoder *decoder); |
| static FLAC__StreamDecoderReadStatus read_callback_(const OggFLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data); |
| static FLAC__StreamDecoderWriteStatus write_callback_(const OggFLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data); |
| static void metadata_callback_(const OggFLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data); |
| static void error_callback_(const OggFLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); |
| static FLAC__bool seek_to_absolute_sample_(OggFLAC__SeekableStreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); |
| |
| /*********************************************************************** |
| * |
| * Private class data |
| * |
| ***********************************************************************/ |
| |
| typedef struct OggFLAC__SeekableStreamDecoderPrivate { |
| OggFLAC__SeekableStreamDecoderReadCallback read_callback; |
| OggFLAC__SeekableStreamDecoderSeekCallback seek_callback; |
| OggFLAC__SeekableStreamDecoderTellCallback tell_callback; |
| OggFLAC__SeekableStreamDecoderLengthCallback length_callback; |
| OggFLAC__SeekableStreamDecoderEofCallback eof_callback; |
| OggFLAC__SeekableStreamDecoderWriteCallback write_callback; |
| OggFLAC__SeekableStreamDecoderMetadataCallback metadata_callback; |
| OggFLAC__SeekableStreamDecoderErrorCallback error_callback; |
| void *client_data; |
| OggFLAC__StreamDecoder *stream_decoder; |
| FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek */ |
| struct FLAC__MD5Context md5context; |
| FLAC__byte stored_md5sum[16]; /* this is what is stored in the metadata */ |
| FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */ |
| /* the rest of these are only used for seeking: */ |
| FLAC__StreamMetadata_StreamInfo stream_info; /* we keep this around so we can figure out how to seek quickly */ |
| const FLAC__StreamMetadata_SeekTable *seek_table; /* we hold a pointer to the stream decoder's seek table for the same reason */ |
| /* Since we always want to see the STREAMINFO and SEEK_TABLE blocks at this level, we need some extra flags to keep track of whether they should be passed on up through the metadata_callback */ |
| FLAC__bool ignore_stream_info_block; |
| FLAC__bool ignore_seek_table_block; |
| FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */ |
| FLAC__uint64 target_sample; |
| FLAC__bool got_a_frame; /* hack needed in seek routine to check when process_single() actually writes a frame */ |
| } OggFLAC__SeekableStreamDecoderPrivate; |
| |
| /*********************************************************************** |
| * |
| * Public static class data |
| * |
| ***********************************************************************/ |
| |
| OggFLAC_API const char * const OggFLAC__SeekableStreamDecoderStateString[] = { |
| "OggFLAC__SEEKABLE_STREAM_DECODER_OK", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_SEEKING", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_MEMORY_ALLOCATION_ERROR", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_READ_ERROR", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED" |
| }; |
| |
| OggFLAC_API const char * const OggFLAC__SeekableStreamDecoderReadStatusString[] = { |
| "OggFLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR" |
| }; |
| |
| OggFLAC_API const char * const OggFLAC__SeekableStreamDecoderSeekStatusString[] = { |
| "OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR" |
| }; |
| |
| OggFLAC_API const char * const OggFLAC__SeekableStreamDecoderTellStatusString[] = { |
| "OggFLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR" |
| }; |
| |
| OggFLAC_API const char * const OggFLAC__SeekableStreamDecoderLengthStatusString[] = { |
| "OggFLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK", |
| "OggFLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR" |
| }; |
| |
| |
| /*********************************************************************** |
| * |
| * Class constructor/destructor |
| * |
| ***********************************************************************/ |
| |
| OggFLAC_API OggFLAC__SeekableStreamDecoder *OggFLAC__seekable_stream_decoder_new() |
| { |
| OggFLAC__SeekableStreamDecoder *decoder; |
| |
| FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ |
| |
| decoder = (OggFLAC__SeekableStreamDecoder*)calloc(1, sizeof(OggFLAC__SeekableStreamDecoder)); |
| if(decoder == 0) { |
| return 0; |
| } |
| |
| decoder->protected_ = (OggFLAC__SeekableStreamDecoderProtected*)calloc(1, sizeof(OggFLAC__SeekableStreamDecoderProtected)); |
| if(decoder->protected_ == 0) { |
| free(decoder); |
| return 0; |
| } |
| |
| decoder->private_ = (OggFLAC__SeekableStreamDecoderPrivate*)calloc(1, sizeof(OggFLAC__SeekableStreamDecoderPrivate)); |
| if(decoder->private_ == 0) { |
| free(decoder->protected_); |
| free(decoder); |
| return 0; |
| } |
| |
| decoder->private_->stream_decoder = OggFLAC__stream_decoder_new(); |
| if(0 == decoder->private_->stream_decoder) { |
| free(decoder->private_); |
| free(decoder->protected_); |
| free(decoder); |
| return 0; |
| } |
| |
| set_defaults_(decoder); |
| |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED; |
| |
| return decoder; |
| } |
| |
| OggFLAC_API void OggFLAC__seekable_stream_decoder_delete(OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->protected_); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->private_->stream_decoder); |
| |
| (void)OggFLAC__seekable_stream_decoder_finish(decoder); |
| |
| OggFLAC__stream_decoder_delete(decoder->private_->stream_decoder); |
| |
| free(decoder->private_); |
| free(decoder->protected_); |
| free(decoder); |
| } |
| |
| /*********************************************************************** |
| * |
| * Public class methods |
| * |
| ***********************************************************************/ |
| |
| OggFLAC_API OggFLAC__SeekableStreamDecoderState OggFLAC__seekable_stream_decoder_init(OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED; |
| |
| if(0 == decoder->private_->read_callback || 0 == decoder->private_->seek_callback || 0 == decoder->private_->tell_callback || 0 == decoder->private_->length_callback || 0 == decoder->private_->eof_callback) |
| return decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK; |
| |
| if(0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback) |
| return decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK; |
| |
| decoder->private_->seek_table = 0; |
| |
| decoder->private_->do_md5_checking = decoder->protected_->md5_checking; |
| |
| /* We initialize the FLAC__MD5Context even though we may never use it. This |
| * is because md5 checking may be turned on to start and then turned off if |
| * a seek occurs. So we always init the context here and finalize it in |
| * OggFLAC__seekable_stream_decoder_finish() to make sure things are always |
| * cleaned up properly. |
| */ |
| FLAC__MD5Init(&decoder->private_->md5context); |
| |
| OggFLAC__stream_decoder_set_read_callback(decoder->private_->stream_decoder, read_callback_); |
| OggFLAC__stream_decoder_set_write_callback(decoder->private_->stream_decoder, write_callback_); |
| OggFLAC__stream_decoder_set_metadata_callback(decoder->private_->stream_decoder, metadata_callback_); |
| OggFLAC__stream_decoder_set_error_callback(decoder->private_->stream_decoder, error_callback_); |
| OggFLAC__stream_decoder_set_client_data(decoder->private_->stream_decoder, decoder); |
| |
| /* We always want to see these blocks. Whether or not we pass them up |
| * through the metadata callback will be determined by flags set in our |
| * implementation of ..._set_metadata_respond/ignore...() |
| */ |
| OggFLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_STREAMINFO); |
| OggFLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_SEEKTABLE); |
| |
| if(OggFLAC__stream_decoder_init(decoder->private_->stream_decoder) != OggFLAC__STREAM_DECODER_OK) |
| return decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; |
| |
| return decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_OK; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_finish(OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__bool md5_failed = false; |
| |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| |
| if(decoder->protected_->state == OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return true; |
| |
| FLAC__ASSERT(0 != decoder->private_->stream_decoder); |
| |
| /* see the comment in OggFLAC__seekable_stream_decoder_init() as to why we |
| * always call FLAC__MD5Final() |
| */ |
| FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context); |
| |
| OggFLAC__stream_decoder_finish(decoder->private_->stream_decoder); |
| |
| if(decoder->private_->do_md5_checking) { |
| if(memcmp(decoder->private_->stored_md5sum, decoder->private_->computed_md5sum, 16)) |
| md5_failed = true; |
| } |
| |
| set_defaults_(decoder); |
| |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED; |
| |
| return !md5_failed; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_md5_checking(OggFLAC__SeekableStreamDecoder *decoder, FLAC__bool value) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->protected_); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->protected_->md5_checking = value; |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_read_callback(OggFLAC__SeekableStreamDecoder *decoder, OggFLAC__SeekableStreamDecoderReadCallback value) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->private_->read_callback = value; |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_seek_callback(OggFLAC__SeekableStreamDecoder *decoder, OggFLAC__SeekableStreamDecoderSeekCallback value) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->private_->seek_callback = value; |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_tell_callback(OggFLAC__SeekableStreamDecoder *decoder, OggFLAC__SeekableStreamDecoderTellCallback value) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->private_->tell_callback = value; |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_length_callback(OggFLAC__SeekableStreamDecoder *decoder, OggFLAC__SeekableStreamDecoderLengthCallback value) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->private_->length_callback = value; |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_eof_callback(OggFLAC__SeekableStreamDecoder *decoder, OggFLAC__SeekableStreamDecoderEofCallback value) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->private_->eof_callback = value; |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_write_callback(OggFLAC__SeekableStreamDecoder *decoder, OggFLAC__SeekableStreamDecoderWriteCallback value) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->private_->write_callback = value; |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_metadata_callback(OggFLAC__SeekableStreamDecoder *decoder, OggFLAC__SeekableStreamDecoderMetadataCallback value) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->private_->metadata_callback = value; |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_error_callback(OggFLAC__SeekableStreamDecoder *decoder, OggFLAC__SeekableStreamDecoderErrorCallback value) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->private_->error_callback = value; |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_client_data(OggFLAC__SeekableStreamDecoder *decoder, void *value) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->private_->client_data = value; |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_serial_number(OggFLAC__SeekableStreamDecoder *decoder, long value) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| OggFLAC__stream_decoder_set_serial_number(decoder->private_->stream_decoder, value); |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_metadata_respond(OggFLAC__SeekableStreamDecoder *decoder, FLAC__MetadataType type) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| FLAC__ASSERT(0 != decoder->private_->stream_decoder); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| if(type == FLAC__METADATA_TYPE_STREAMINFO) |
| decoder->private_->ignore_stream_info_block = false; |
| else if(type == FLAC__METADATA_TYPE_SEEKTABLE) |
| decoder->private_->ignore_seek_table_block = false; |
| return OggFLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, type); |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_metadata_respond_application(OggFLAC__SeekableStreamDecoder *decoder, const FLAC__byte id[4]) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| FLAC__ASSERT(0 != decoder->private_->stream_decoder); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| return OggFLAC__stream_decoder_set_metadata_respond_application(decoder->private_->stream_decoder, id); |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_metadata_respond_all(OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| FLAC__ASSERT(0 != decoder->private_->stream_decoder); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->private_->ignore_stream_info_block = false; |
| decoder->private_->ignore_seek_table_block = false; |
| return OggFLAC__stream_decoder_set_metadata_respond_all(decoder->private_->stream_decoder); |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_metadata_ignore(OggFLAC__SeekableStreamDecoder *decoder, FLAC__MetadataType type) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| FLAC__ASSERT(0 != decoder->private_->stream_decoder); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| if(type == FLAC__METADATA_TYPE_STREAMINFO) { |
| decoder->private_->ignore_stream_info_block = true; |
| return true; |
| } |
| else if(type == FLAC__METADATA_TYPE_SEEKTABLE) { |
| decoder->private_->ignore_seek_table_block = true; |
| return true; |
| } |
| else |
| return OggFLAC__stream_decoder_set_metadata_ignore(decoder->private_->stream_decoder, type); |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_metadata_ignore_application(OggFLAC__SeekableStreamDecoder *decoder, const FLAC__byte id[4]) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| FLAC__ASSERT(0 != decoder->private_->stream_decoder); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| return OggFLAC__stream_decoder_set_metadata_ignore_application(decoder->private_->stream_decoder, id); |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_set_metadata_ignore_all(OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| FLAC__ASSERT(0 != decoder->private_->stream_decoder); |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) |
| return false; |
| decoder->private_->ignore_stream_info_block = true; |
| decoder->private_->ignore_seek_table_block = true; |
| return |
| OggFLAC__stream_decoder_set_metadata_ignore_all(decoder->private_->stream_decoder) && |
| OggFLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_STREAMINFO) && |
| OggFLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_SEEKTABLE); |
| } |
| |
| OggFLAC_API OggFLAC__SeekableStreamDecoderState OggFLAC__seekable_stream_decoder_get_state(const OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->protected_); |
| return decoder->protected_->state; |
| } |
| |
| OggFLAC_API OggFLAC__StreamDecoderState OggFLAC__seekable_stream_decoder_get_stream_decoder_state(const OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| return OggFLAC__stream_decoder_get_state(decoder->private_->stream_decoder); |
| } |
| |
| OggFLAC_API FLAC__StreamDecoderState OggFLAC__seekable_stream_decoder_get_FLAC_stream_decoder_state(const OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| return OggFLAC__stream_decoder_get_FLAC_stream_decoder_state(decoder->private_->stream_decoder); |
| } |
| |
| OggFLAC_API const char *OggFLAC__seekable_stream_decoder_get_resolved_state_string(const OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| if(decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR) |
| return OggFLAC__SeekableStreamDecoderStateString[decoder->protected_->state]; |
| else |
| return OggFLAC__stream_decoder_get_resolved_state_string(decoder->private_->stream_decoder); |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_get_md5_checking(const OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->protected_); |
| return decoder->protected_->md5_checking; |
| } |
| |
| OggFLAC_API unsigned OggFLAC__seekable_stream_decoder_get_channels(const OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| return OggFLAC__stream_decoder_get_channels(decoder->private_->stream_decoder); |
| } |
| |
| OggFLAC_API FLAC__ChannelAssignment OggFLAC__seekable_stream_decoder_get_channel_assignment(const OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| return OggFLAC__stream_decoder_get_channel_assignment(decoder->private_->stream_decoder); |
| } |
| |
| OggFLAC_API unsigned OggFLAC__seekable_stream_decoder_get_bits_per_sample(const OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| return OggFLAC__stream_decoder_get_bits_per_sample(decoder->private_->stream_decoder); |
| } |
| |
| OggFLAC_API unsigned OggFLAC__seekable_stream_decoder_get_sample_rate(const OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| return OggFLAC__stream_decoder_get_sample_rate(decoder->private_->stream_decoder); |
| } |
| |
| OggFLAC_API unsigned OggFLAC__seekable_stream_decoder_get_blocksize(const OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| return OggFLAC__stream_decoder_get_blocksize(decoder->private_->stream_decoder); |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_flush(OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| |
| decoder->private_->do_md5_checking = false; |
| |
| if(!OggFLAC__stream_decoder_flush(decoder->private_->stream_decoder)) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; |
| return false; |
| } |
| |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_OK; |
| |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_reset(OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->protected_); |
| |
| if(!OggFLAC__seekable_stream_decoder_flush(decoder)) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; |
| return false; |
| } |
| |
| if(!OggFLAC__stream_decoder_reset(decoder->private_->stream_decoder)) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; |
| return false; |
| } |
| |
| decoder->private_->seek_table = 0; |
| |
| decoder->private_->do_md5_checking = decoder->protected_->md5_checking; |
| |
| /* We initialize the FLAC__MD5Context even though we may never use it. This |
| * is because md5 checking may be turned on to start and then turned off if |
| * a seek occurs. So we always init the context here and finalize it in |
| * OggFLAC__seekable_stream_decoder_finish() to make sure things are always |
| * cleaned up properly. |
| */ |
| FLAC__MD5Init(&decoder->private_->md5context); |
| |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_OK; |
| |
| return true; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_process_single(OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__bool ret; |
| FLAC__ASSERT(0 != decoder); |
| |
| if(decoder->private_->stream_decoder->protected_->state == OggFLAC__STREAM_DECODER_END_OF_STREAM) |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; |
| |
| if(decoder->protected_->state == OggFLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) |
| return true; |
| |
| FLAC__ASSERT(decoder->protected_->state == OggFLAC__SEEKABLE_STREAM_DECODER_OK); |
| |
| ret = OggFLAC__stream_decoder_process_single(decoder->private_->stream_decoder); |
| if(!ret) |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; |
| |
| return ret; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_process_until_end_of_metadata(OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__bool ret; |
| FLAC__ASSERT(0 != decoder); |
| |
| if(decoder->private_->stream_decoder->protected_->state == OggFLAC__STREAM_DECODER_END_OF_STREAM) |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; |
| |
| if(decoder->protected_->state == OggFLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) |
| return true; |
| |
| FLAC__ASSERT(decoder->protected_->state == OggFLAC__SEEKABLE_STREAM_DECODER_OK); |
| |
| ret = OggFLAC__stream_decoder_process_until_end_of_metadata(decoder->private_->stream_decoder); |
| if(!ret) |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; |
| |
| return ret; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_process_until_end_of_stream(OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| FLAC__bool ret; |
| FLAC__ASSERT(0 != decoder); |
| |
| if(decoder->private_->stream_decoder->protected_->state == OggFLAC__STREAM_DECODER_END_OF_STREAM) |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; |
| |
| if(decoder->protected_->state == OggFLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) |
| return true; |
| |
| FLAC__ASSERT(decoder->protected_->state == OggFLAC__SEEKABLE_STREAM_DECODER_OK); |
| |
| ret = OggFLAC__stream_decoder_process_until_end_of_stream(decoder->private_->stream_decoder); |
| if(!ret) |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; |
| |
| return ret; |
| } |
| |
| OggFLAC_API FLAC__bool OggFLAC__seekable_stream_decoder_seek_absolute(OggFLAC__SeekableStreamDecoder *decoder, FLAC__uint64 sample) |
| { |
| FLAC__uint64 length; |
| |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(decoder->protected_->state == OggFLAC__SEEKABLE_STREAM_DECODER_OK || decoder->protected_->state == OggFLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM); |
| |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_SEEKING; |
| |
| /* turn off md5 checking if a seek is attempted */ |
| decoder->private_->do_md5_checking = false; |
| |
| if(!OggFLAC__stream_decoder_reset(decoder->private_->stream_decoder)) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; |
| return false; |
| } |
| /* get the file length */ |
| if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != OggFLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; |
| return false; |
| } |
| /* rewind */ |
| if(decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) != OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; |
| return false; |
| } |
| if(!OggFLAC__stream_decoder_process_until_end_of_metadata(decoder->private_->stream_decoder)) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; |
| return false; |
| } |
| if(decoder->private_->stream_info.total_samples > 0 && sample >= decoder->private_->stream_info.total_samples) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; |
| return false; |
| } |
| |
| return seek_to_absolute_sample_(decoder, length, sample); |
| } |
| |
| /*********************************************************************** |
| * |
| * Private class methods |
| * |
| ***********************************************************************/ |
| |
| void set_defaults_(OggFLAC__SeekableStreamDecoder *decoder) |
| { |
| decoder->private_->read_callback = 0; |
| decoder->private_->seek_callback = 0; |
| decoder->private_->tell_callback = 0; |
| decoder->private_->length_callback = 0; |
| decoder->private_->eof_callback = 0; |
| decoder->private_->write_callback = 0; |
| decoder->private_->metadata_callback = 0; |
| decoder->private_->error_callback = 0; |
| decoder->private_->client_data = 0; |
| /* WATCHOUT: these should match the default behavior of OggFLAC__StreamDecoder */ |
| decoder->private_->ignore_stream_info_block = false; |
| decoder->private_->ignore_seek_table_block = true; |
| |
| decoder->protected_->md5_checking = false; |
| } |
| |
| FLAC__StreamDecoderReadStatus read_callback_(const OggFLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data) |
| { |
| OggFLAC__SeekableStreamDecoder *seekable_stream_decoder = (OggFLAC__SeekableStreamDecoder *)client_data; |
| (void)decoder; |
| if(seekable_stream_decoder->private_->eof_callback(seekable_stream_decoder, seekable_stream_decoder->private_->client_data)) { |
| *bytes = 0; |
| #if 0 |
| /*@@@@@@ we used to do this: */ |
| seekable_stream_decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; |
| /* but it causes a problem because the Ogg decoding layer reads as much as it can to get pages, so the state will get to end-of-stream before the bitbuffer does */ |
| #endif |
| return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; |
| } |
| else if(*bytes > 0) { |
| if(seekable_stream_decoder->private_->read_callback(seekable_stream_decoder, buffer, bytes, seekable_stream_decoder->private_->client_data) != OggFLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK) { |
| seekable_stream_decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_READ_ERROR; |
| return FLAC__STREAM_DECODER_READ_STATUS_ABORT; |
| } |
| if(*bytes == 0) { |
| if(seekable_stream_decoder->private_->eof_callback(seekable_stream_decoder, seekable_stream_decoder->private_->client_data)) { |
| #if 0 |
| /*@@@@@@ we used to do this: */ |
| seekable_stream_decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM; |
| /* but it causes a problem because the Ogg decoding layer reads as much as it can to get pages, so the state will get to end-of-stream before the bitbuffer does */ |
| #endif |
| return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; |
| } |
| else |
| return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; |
| } |
| else { |
| return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; |
| } |
| } |
| else |
| return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */ |
| } |
| |
| FLAC__StreamDecoderWriteStatus write_callback_(const OggFLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data) |
| { |
| OggFLAC__SeekableStreamDecoder *seekable_stream_decoder = (OggFLAC__SeekableStreamDecoder *)client_data; |
| (void)decoder; |
| |
| if(seekable_stream_decoder->protected_->state == OggFLAC__SEEKABLE_STREAM_DECODER_SEEKING) { |
| FLAC__uint64 this_frame_sample = frame->header.number.sample_number; |
| FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize; |
| FLAC__uint64 target_sample = seekable_stream_decoder->private_->target_sample; |
| |
| FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); |
| |
| seekable_stream_decoder->private_->got_a_frame = true; |
| seekable_stream_decoder->private_->last_frame = *frame; /* save the frame */ |
| if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */ |
| unsigned delta = (unsigned)(target_sample - this_frame_sample); |
| /* kick out of seek mode */ |
| seekable_stream_decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_OK; |
| /* shift out the samples before target_sample */ |
| if(delta > 0) { |
| unsigned channel; |
| const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS]; |
| for(channel = 0; channel < frame->header.channels; channel++) |
| newbuffer[channel] = buffer[channel] + delta; |
| seekable_stream_decoder->private_->last_frame.header.blocksize -= delta; |
| seekable_stream_decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta; |
| /* write the relevant samples */ |
| return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, &seekable_stream_decoder->private_->last_frame, newbuffer, seekable_stream_decoder->private_->client_data); |
| } |
| else { |
| /* write the relevant samples */ |
| return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, frame, buffer, seekable_stream_decoder->private_->client_data); |
| } |
| } |
| else { |
| return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; |
| } |
| } |
| else { |
| if(seekable_stream_decoder->private_->do_md5_checking) { |
| if(!FLAC__MD5Accumulate(&seekable_stream_decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8)) |
| return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; |
| } |
| return seekable_stream_decoder->private_->write_callback(seekable_stream_decoder, frame, buffer, seekable_stream_decoder->private_->client_data); |
| } |
| } |
| |
| void metadata_callback_(const OggFLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data) |
| { |
| OggFLAC__SeekableStreamDecoder *seekable_stream_decoder = (OggFLAC__SeekableStreamDecoder *)client_data; |
| (void)decoder; |
| |
| if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) { |
| seekable_stream_decoder->private_->stream_info = metadata->data.stream_info; |
| /* save the MD5 signature for comparison later */ |
| memcpy(seekable_stream_decoder->private_->stored_md5sum, metadata->data.stream_info.md5sum, 16); |
| if(0 == memcmp(seekable_stream_decoder->private_->stored_md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16)) |
| seekable_stream_decoder->private_->do_md5_checking = false; |
| } |
| else if(metadata->type == FLAC__METADATA_TYPE_SEEKTABLE) { |
| seekable_stream_decoder->private_->seek_table = &metadata->data.seek_table; |
| } |
| |
| if(seekable_stream_decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_SEEKING) { |
| FLAC__bool ignore_block = false; |
| if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO && seekable_stream_decoder->private_->ignore_stream_info_block) |
| ignore_block = true; |
| else if(metadata->type == FLAC__METADATA_TYPE_SEEKTABLE && seekable_stream_decoder->private_->ignore_seek_table_block) |
| ignore_block = true; |
| if(!ignore_block) |
| seekable_stream_decoder->private_->metadata_callback(seekable_stream_decoder, metadata, seekable_stream_decoder->private_->client_data); |
| } |
| } |
| |
| void error_callback_(const OggFLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) |
| { |
| OggFLAC__SeekableStreamDecoder *seekable_stream_decoder = (OggFLAC__SeekableStreamDecoder *)client_data; |
| (void)decoder; |
| |
| if(seekable_stream_decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_SEEKING) |
| seekable_stream_decoder->private_->error_callback(seekable_stream_decoder, status, seekable_stream_decoder->private_->client_data); |
| } |
| |
| FLAC__bool seek_to_absolute_sample_(OggFLAC__SeekableStreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) |
| { |
| FLAC__uint64 left_pos = 0, right_pos = stream_length; |
| FLAC__uint64 left_sample = 0, right_sample = decoder->private_->stream_info.total_samples; |
| FLAC__uint64 this_frame_sample = 0; /* only initialized to avoid compiler warning */ |
| FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */ |
| FLAC__bool did_a_seek; |
| unsigned iteration = 0; |
| |
| /* In the first iterations, we will calculate the target byte position |
| * by the distance from the target sample to left_sample and |
| * right_sample (let's call it "proportional search"). After that, we |
| * will switch to binary search. |
| */ |
| unsigned BINARY_SEARCH_AFTER_ITERATION = 2; |
| |
| /* We will switch to a linear search once our current sample is less |
| * that this number of samples ahead of the target sample |
| */ |
| static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2; |
| |
| /* If the total number of samples is unknown, use a large value and |
| * increase 'iteration' to force binary search immediately. |
| */ |
| if(right_sample == 0) { |
| right_sample = (FLAC__uint64)(-1); |
| BINARY_SEARCH_AFTER_ITERATION = 0; |
| } |
| |
| decoder->private_->target_sample = target_sample; |
| for( ; ; iteration++) { |
| if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) { |
| if (iteration >= BINARY_SEARCH_AFTER_ITERATION) { |
| pos = (right_pos + left_pos) / 2; |
| } |
| else { |
| #ifndef FLAC__INTEGER_ONLY_LIBRARY |
| #if defined _MSC_VER || defined __MINGW32__ |
| /* with MSVC you have to spoon feed it the casting */ |
| pos = (FLAC__uint64)((FLAC__double)(FLAC__int64)(target_sample - left_sample) / (FLAC__double)(FLAC__int64)(right_sample - left_sample) * (FLAC__double)(FLAC__int64)(right_pos - left_pos)); |
| #else |
| pos = (FLAC__uint64)((FLAC__double)(target_sample - left_sample) / (FLAC__double)(right_sample - left_sample) * (FLAC__double)(right_pos - left_pos)); |
| #endif |
| #else |
| /* a little less accurate: */ |
| if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff)) |
| pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample)); |
| else /* @@@ WATCHOUT, ~2TB limit */ |
| pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16)); |
| #endif |
| /* @@@ TODO: might want to limit pos to some distance |
| * before EOF, to make sure we land before the last frame, |
| * thereby getting a this_fram_sample and so having a better |
| * estimate. this would also mostly (or totally if we could |
| * be sure to land before the last frame) avoid the |
| * end-of-stream case we have to check later. |
| */ |
| } |
| |
| /* physical seek */ |
| if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; |
| return false; |
| } |
| if(!OggFLAC__stream_decoder_flush(decoder->private_->stream_decoder)) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; |
| return false; |
| } |
| did_a_seek = true; |
| } |
| else |
| did_a_seek = false; |
| |
| decoder->private_->got_a_frame = false; |
| if(!OggFLAC__stream_decoder_process_single(decoder->private_->stream_decoder)) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; |
| return false; |
| } |
| if(!decoder->private_->got_a_frame) { |
| if(did_a_seek) { |
| /* this can happen if we seek to a point after the last frame; we drop |
| * to binary search right away in this case to avoid any wasted |
| * iterations of proportional search. |
| */ |
| right_pos = pos; |
| BINARY_SEARCH_AFTER_ITERATION = 0; |
| } |
| else { |
| /* this can probably only happen if total_samples is unknown and the |
| * target_sample is past the end of the stream |
| */ |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; |
| return false; |
| } |
| } |
| /* our write callback will change the state when it gets to the target frame */ |
| else if( |
| decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_SEEKING && |
| decoder->protected_->state != OggFLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM |
| ) { |
| break; |
| } |
| else { |
| this_frame_sample = decoder->private_->last_frame.header.number.sample_number; |
| FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); |
| |
| if (did_a_seek) { |
| if (this_frame_sample <= target_sample) { |
| /* The 'equal' case should not happen, since |
| * OggFLAC__stream_decoder_process_single() |
| * should recognize that it has hit the |
| * target sample and we would exit through |
| * the 'break' above. |
| */ |
| FLAC__ASSERT(this_frame_sample != target_sample); |
| |
| left_sample = this_frame_sample; |
| /* sanity check to avoid infinite loop */ |
| if (left_pos == pos) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; |
| return false; |
| } |
| left_pos = pos; |
| } |
| else if(this_frame_sample > target_sample) { |
| right_sample = this_frame_sample; |
| /* sanity check to avoid infinite loop */ |
| if (right_pos == pos) { |
| decoder->protected_->state = OggFLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; |
| return false; |
| } |
| right_pos = pos; |
| } |
| } |
| } |
| } |
| |
| return true; |
| } |