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fix bug where decoder wasn't getting streaminfo or seektable in all cases; improve seek algo slightly

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This commit is contained in:
Josh Coalson
2002-06-21 01:34:18 +00:00
parent 1ac8321dd4
commit 5e028f931c
1 changed files with 93 additions and 23 deletions
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112
src/libFLAC/seekable_stream_decoder.c
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@@ -61,6 +61,9 @@ typedef struct FLAC__SeekableStreamDecoderPrivate {
/* the rest of these are only used for seeking: */ /* 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 */ 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 */ 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__Frame last_frame; /* holds the info of the last frame we seeked to */
FLAC__uint64 target_sample; FLAC__uint64 target_sample;
} FLAC__SeekableStreamDecoderPrivate; } FLAC__SeekableStreamDecoderPrivate;
@@ -199,6 +202,13 @@ FLAC__SeekableStreamDecoderState FLAC__seekable_stream_decoder_init(FLAC__Seekab
FLAC__stream_decoder_set_error_callback(decoder->private_->stream_decoder, error_callback_); FLAC__stream_decoder_set_error_callback(decoder->private_->stream_decoder, error_callback_);
FLAC__stream_decoder_set_client_data(decoder->private_->stream_decoder, decoder); FLAC__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...()
*/
FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_STREAMINFO);
FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, FLAC__METADATA_TYPE_SEEKTABLE);
if(FLAC__stream_decoder_init(decoder->private_->stream_decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA) if(FLAC__stream_decoder_init(decoder->private_->stream_decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA)
return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; return decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
@@ -354,6 +364,10 @@ FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond(FLAC__SeekableStre
FLAC__ASSERT(decoder->private_->stream_decoder != 0); FLAC__ASSERT(decoder->private_->stream_decoder != 0);
if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
return false; 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 FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, type); return FLAC__stream_decoder_set_metadata_respond(decoder->private_->stream_decoder, type);
} }
@@ -376,6 +390,8 @@ FLAC__bool FLAC__seekable_stream_decoder_set_metadata_respond_all(FLAC__Seekable
FLAC__ASSERT(decoder->private_->stream_decoder != 0); FLAC__ASSERT(decoder->private_->stream_decoder != 0);
if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
return false; return false;
decoder->private_->ignore_stream_info_block = false;
decoder->private_->ignore_seek_table_block = false;
return FLAC__stream_decoder_set_metadata_respond_all(decoder->private_->stream_decoder); return FLAC__stream_decoder_set_metadata_respond_all(decoder->private_->stream_decoder);
} }
@@ -387,6 +403,10 @@ FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore(FLAC__SeekableStrea
FLAC__ASSERT(decoder->private_->stream_decoder != 0); FLAC__ASSERT(decoder->private_->stream_decoder != 0);
if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
return false; return false;
if(type == FLAC__METADATA_TYPE_STREAMINFO)
decoder->private_->ignore_stream_info_block = true;
else if(type == FLAC__METADATA_TYPE_SEEKTABLE)
decoder->private_->ignore_seek_table_block = true;
return FLAC__stream_decoder_set_metadata_ignore(decoder->private_->stream_decoder, type); return FLAC__stream_decoder_set_metadata_ignore(decoder->private_->stream_decoder, type);
} }
@@ -409,6 +429,8 @@ FLAC__bool FLAC__seekable_stream_decoder_set_metadata_ignore_all(FLAC__SeekableS
FLAC__ASSERT(decoder->private_->stream_decoder != 0); FLAC__ASSERT(decoder->private_->stream_decoder != 0);
if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED) if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED)
return false; return false;
decoder->private_->ignore_stream_info_block = true;
decoder->private_->ignore_seek_table_block = true;
return FLAC__stream_decoder_set_metadata_ignore_all(decoder->private_->stream_decoder); return FLAC__stream_decoder_set_metadata_ignore_all(decoder->private_->stream_decoder);
} }
@@ -610,7 +632,7 @@ FLAC__bool FLAC__seekable_stream_decoder_seek_absolute(FLAC__SeekableStreamDecod
decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR; decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR;
return false; return false;
} }
if(sample > decoder->private_->stream_info.total_samples) { if(decoder->private_->stream_info.total_samples > 0 && sample > decoder->private_->stream_info.total_samples) {
decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
return false; return false;
} }
@@ -635,6 +657,9 @@ void seekable_stream_decoder_set_defaults_(FLAC__SeekableStreamDecoder *decoder)
decoder->private_->metadata_callback = 0; decoder->private_->metadata_callback = 0;
decoder->private_->error_callback = 0; decoder->private_->error_callback = 0;
decoder->private_->client_data = 0; decoder->private_->client_data = 0;
/* WATCHOUT: these should match the default behavior of FLAC__StreamDecoder */
decoder->private_->ignore_stream_info_block = false;
decoder->private_->ignore_seek_table_block = true;
decoder->protected_->md5_checking = false; decoder->protected_->md5_checking = false;
} }
@@ -732,9 +757,16 @@ void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMe
seekable_stream_decoder->private_->seek_table = &metadata->data.seek_table; seekable_stream_decoder->private_->seek_table = &metadata->data.seek_table;
} }
if(seekable_stream_decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING) if(seekable_stream_decoder->protected_->state != FLAC__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); seekable_stream_decoder->private_->metadata_callback(seekable_stream_decoder, metadata, seekable_stream_decoder->private_->client_data);
} }
}
void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
{ {
@@ -753,18 +785,29 @@ FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__
unsigned approx_bytes_per_frame; unsigned approx_bytes_per_frame;
FLAC__uint64 last_frame_sample = 0xffffffffffffffff; FLAC__uint64 last_frame_sample = 0xffffffffffffffff;
FLAC__bool needs_seek; FLAC__bool needs_seek;
const FLAC__bool is_variable_blocksize_stream = (decoder->private_->stream_info.min_blocksize != decoder->private_->stream_info.max_blocksize); const FLAC__uint64 total_samples = decoder->private_->stream_info.total_samples;
const unsigned min_blocksize = decoder->private_->stream_info.min_blocksize;
const unsigned max_blocksize = decoder->private_->stream_info.max_blocksize;
const unsigned max_framesize = decoder->private_->stream_info.max_framesize;
const unsigned channels = FLAC__seekable_stream_decoder_get_channels(decoder);
const unsigned bps = FLAC__seekable_stream_decoder_get_bits_per_sample(decoder);
/* we are just guessing here, but we want to guess high, not low */ /* we are just guessing here, but we want to guess high, not low */
if(decoder->private_->stream_info.max_framesize > 0) { if(max_framesize > 0) {
approx_bytes_per_frame = decoder->private_->stream_info.max_framesize; approx_bytes_per_frame = max_framesize;
} }
else if(!is_variable_blocksize_stream) { /*
/* note there are no () around 'decoder->private_->stream_info.bits_per_sample/8' to keep precision up since it's an integer calulation */ * Check if it's a known fixed-blocksize stream. Note that though
approx_bytes_per_frame = decoder->private_->stream_info.min_blocksize * decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample/8 + 64; * the spec doesn't allow zeroes in the STREAMINFO block, we may
* never get a STREAMINFO block when decoding so the value of
* min_blocksize might be zero.
*/
else if(min_blocksize == max_blocksize && min_blocksize > 0) {
/* note there are no () around 'bps/8' to keep precision up since it's an integer calulation */
approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
} }
else else
approx_bytes_per_frame = 1152 * decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample/8 + 64; approx_bytes_per_frame = 4608 * channels * bps/8 + 64;
/* /*
* The stream position is currently at the first frame plus any read * The stream position is currently at the first frame plus any read
@@ -788,10 +831,10 @@ FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__
lower_bound = first_frame_offset; lower_bound = first_frame_offset;
/* calc the upper_bound, beyond which we never want to seek */ /* calc the upper_bound, beyond which we never want to seek */
if(decoder->private_->stream_info.max_framesize > 0) if(max_framesize > 0)
upper_bound = stream_length - (decoder->private_->stream_info.max_framesize + 128 + 2); /* 128 for a possible ID3V1 tag, 2 for indexing differences */ upper_bound = stream_length - (max_framesize + 128 + 2); /* 128 for a possible ID3V1 tag, 2 for indexing differences */
else else
upper_bound = stream_length - ((decoder->private_->stream_info.channels * decoder->private_->stream_info.bits_per_sample * FLAC__MAX_BLOCK_SIZE) / 8 + 128 + 2); upper_bound = stream_length - ((channels * bps * FLAC__MAX_BLOCK_SIZE) / 8 + 128 + 2);
/* /*
* Now we refine the bounds if we have a seektable with * Now we refine the bounds if we have a seektable with
@@ -841,22 +884,47 @@ FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__
#endif #endif
} }
} }
if(pos < 0) {
/* We need to use the metadata and the filelength to estimate the position of the frame with the correct sample */ /*
* If there's no seek table, we need to use the metadata (if we
* have it) and the filelength to estimate the position of the
* frame with the correct sample.
*/
if(pos < 0 && total_samples > 0) {
#if defined _MSC_VER || defined __MINGW32__ #if defined _MSC_VER || defined __MINGW32__
/* with VC++ you have to spoon feed it the casting */ /* with VC++ you have to spoon feed it the casting */
pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)(FLAC__int64)target_sample / (double)(FLAC__int64)decoder->private_->stream_info.total_samples * (double)(FLAC__int64)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame; pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)(FLAC__int64)target_sample / (double)(FLAC__int64)total_samples * (double)(FLAC__int64)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame;
#else #else
pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)target_sample / (double)decoder->private_->stream_info.total_samples * (double)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame; pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((double)target_sample / (double)total_samples * (double)(stream_length-first_frame_offset-1)) - approx_bytes_per_frame;
#endif #endif
} }
/*
* If there's no seek table and total_samples is unknown, we
* don't even bother trying to figure out a target, we just use
* our current position.
*/
if(pos < 0) {
FLAC__uint64 upos;
if(decoder->private_->tell_callback(decoder, &upos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) {
decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
return false;
}
pos = (FLAC__int32)upos;
needs_seek = false;
}
else
needs_seek = true;
/* clip the position to the bounds, lower bound takes precedence */ /* clip the position to the bounds, lower bound takes precedence */
if(pos >= (FLAC__int64)upper_bound) if(pos >= (FLAC__int64)upper_bound) {
pos = (FLAC__int64)upper_bound-1; pos = (FLAC__int64)upper_bound-1;
if(pos < (FLAC__int64)lower_bound) needs_seek = true;
}
if(pos < (FLAC__int64)lower_bound) {
pos = (FLAC__int64)lower_bound; pos = (FLAC__int64)lower_bound;
needs_seek = true; needs_seek = true;
}
decoder->private_->target_sample = target_sample; decoder->private_->target_sample = target_sample;
while(1) { while(1) {
@@ -889,16 +957,18 @@ FLAC__bool seek_to_absolute_sample_(FLAC__SeekableStreamDecoder *decoder, FLAC__
else { else {
if(target_sample < this_frame_sample) { if(target_sample < this_frame_sample) {
last_pos = pos; last_pos = pos;
approx_bytes_per_frame = decoder->private_->last_frame.header.blocksize * decoder->private_->last_frame.header.channels * decoder->private_->last_frame.header.bits_per_sample/8 + 64; approx_bytes_per_frame = decoder->private_->last_frame.header.blocksize * channels * bps/8 + 64;
pos -= approx_bytes_per_frame; pos -= approx_bytes_per_frame;
needs_seek = true; needs_seek = true;
} }
else { /* target_sample >= this_frame_sample + this frame's blocksize */ else { /* target_sample >= this_frame_sample + this frame's blocksize */
last_pos = pos; FLAC__uint64 upos;
if(decoder->private_->tell_callback(decoder, (FLAC__uint64*)(&pos), decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) { if(decoder->private_->tell_callback(decoder, &upos, decoder->private_->client_data) != FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK) {
decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR; decoder->protected_->state = FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR;
return false; return false;
} }
last_pos = pos;
pos = (FLAC__int32)upos;
pos -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder); pos -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder->private_->stream_decoder);
needs_seek = false; needs_seek = false;
} }