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AT3: read skip samples to fix edge loops

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bnnm 2016-12-06 00:28:16 +01:00
parent 6568acc305
commit 80c72166e5
1 changed files with 25 additions and 13 deletions
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38
src/meta/riff.c
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@ -220,6 +220,7 @@ VGMSTREAM * init_vgmstream_riff(STREAMFILE *streamFile) {
off_t file_size = -1;
int sample_count = 0;
int fact_sample_count = -1;
int fact_sample_skip = -1;
off_t start_offset = -1;
int loop_flag = 0;
@ -241,13 +242,13 @@ VGMSTREAM * init_vgmstream_riff(STREAMFILE *streamFile) {
/* Ubisoft sns */
int sns = 0;
/* Sony atrac3 / 3plus */
int at3 = 0;
/* check extension, case insensitive */
streamFile->get_name(streamFile,filename,sizeof(filename));
if (strcasecmp("wav",filename_extension(filename)) &&
strcasecmp("lwav",filename_extension(filename))
#if defined(VGM_USE_MAIATRAC3PLUS) || defined(VGM_USE_FFMPEG)
&& strcasecmp("at3",filename_extension(filename))
#endif
#ifndef VGM_USE_FFMPEG
&& strcasecmp("sgb",filename_extension(filename)) /* SGB has proper support with FFmpeg in ps3_sgdx */
#endif
@ -257,6 +258,10 @@ VGMSTREAM * init_vgmstream_riff(STREAMFILE *streamFile) {
mwv = 1;
else if (!strcasecmp("sns",filename_extension(filename)))
sns = 1;
#if defined(VGM_USE_MAIATRAC3PLUS) || defined(VGM_USE_FFMPEG)
else if (!strcasecmp("at3",filename_extension(filename)))
at3 = 1;
#endif
else
goto fail;
}
@ -350,9 +355,16 @@ VGMSTREAM * init_vgmstream_riff(STREAMFILE *streamFile) {
mwv_ctrl_offset = current_chunk;
break;
case 0x66616374: /* fact */
if (chunk_size != 4
&& (!(sns && chunk_size == 0x10))) break;
fact_sample_count = read_32bitLE(current_chunk+8, streamFile);
if (sns && chunk_size == 0x10) {
fact_sample_count = read_32bitLE(current_chunk+0x8, streamFile);
} else if (at3 && chunk_size == 0x8) {
fact_sample_count = read_32bitLE(current_chunk+0x8, streamFile);
fact_sample_skip = read_32bitLE(current_chunk+0xc, streamFile);
} else if (at3 && chunk_size == 0xc) {
fact_sample_count = read_32bitLE(current_chunk+0x8, streamFile);
fact_sample_skip = read_32bitLE(current_chunk+0x10, streamFile);
}
break;
default:
/* ignorance is bliss */
@ -390,18 +402,18 @@ VGMSTREAM * init_vgmstream_riff(STREAMFILE *streamFile) {
ffmpeg_data = init_ffmpeg_offset(streamFile, 0, streamFile->get_size(streamFile) );
if ( !ffmpeg_data ) goto fail;
sample_count = ffmpeg_data->totalFrames;
sample_count = ffmpeg_data->totalFrames; /* fact_sample_count */
/* the encoder introduces some garbage (usually silent) samples to skip before the stream
* loop values include the skip samples but fact_sample_count doesn't; add them back to fix some edge loops */
if (fact_sample_skip > 0)
sample_count += fact_sample_skip;
}
break;
#endif
#ifdef VGM_USE_MAIATRAC3PLUS
case coding_AT3plus:
/* rough total samples, not totally accurate since there are some skipped samples in the first and (maybe) last frames
* channels shouldn't matter (mono and stereo encoding produces the same number of frames)
*
* to get the correct number of samples you'd need to read the fact_sample_count and skip some samples when decoding
* the first/last samples_to_skip seem related to the ints in the "fact" chunk
* those skipped samples are typically silent so there is not much difference */
/* rough total samples, not totally accurate since there are some skipped samples in the beginning
* channels shouldn't matter (mono and stereo encoding produces the same number of frames in ATRAC3plus) */
sample_count = (data_size / fmt.block_size) * 2048; /* number_of_frames by decoded_samples_per_frame */
break;
#endif