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Tweak FFmpeg XMA1 fake RIFF

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This commit is contained in:
bnnm 2017-02-25 17:29:25 +01:00
parent 0296be392f
commit fbb9af5410
3 changed files with 37 additions and 13 deletions
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2
src/coding/coding.h
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@ -163,7 +163,7 @@ void seek_ffmpeg(VGMSTREAM *vgmstream, int32_t num_sample);
void ffmpeg_set_skip_samples(ffmpeg_codec_data * data, int skip_samples);
int ffmpeg_make_riff_atrac3(uint8_t * buf, size_t buf_size, size_t sample_count, size_t data_size, int channels, int sample_rate, int block_align, int joint_stereo, int encoder_delay);
int ffmpeg_make_riff_xma1(uint8_t * buf, size_t buf_size, size_t sample_count, size_t data_size, int channels, int sample_rate);
int ffmpeg_make_riff_xma1(uint8_t * buf, size_t buf_size, size_t sample_count, size_t data_size, int channels, int sample_rate, int stream_mode);
int ffmpeg_make_riff_xma2(uint8_t * buf, size_t buf_size, size_t sample_count, size_t data_size, int channels, int sample_rate, int block_count, int block_size);
int ffmpeg_make_riff_xma2_from_fmt(uint8_t * buf, size_t buf_size, off_t fmt_offset, size_t fmt_size, size_t data_size, STREAMFILE *streamFile, int big_endian);
int ffmpeg_make_riff_xwma(uint8_t * buf, size_t buf_size, int codec, size_t sample_count, size_t data_size, int channels, int sample_rate, int avg_bps, int block_align);

30
src/coding/ffmpeg_decoder_utils.c
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@ -48,12 +48,20 @@ int ffmpeg_make_riff_atrac3(uint8_t * buf, size_t buf_size, size_t sample_count,
return riff_size;
}
int ffmpeg_make_riff_xma1(uint8_t * buf, size_t buf_size, size_t sample_count, size_t data_size, int channels, int sample_rate) {
int ffmpeg_make_riff_xma1(uint8_t * buf, size_t buf_size, size_t sample_count, size_t data_size, int channels, int sample_rate, int stream_mode) {
uint16_t codec_XMA1 = 0x0165;
size_t riff_size;
int streams, i;
streams = (channels + 1) / 2;
/* stream disposition:
* 0: default (ex. 5ch = 2ch + 2ch + 1ch = 3 streams)
* 1: lineal (ex. 5ch = 1ch + 1ch + 1ch + 1ch + 1ch = 5 streams), unusual but exists
* others: not seen (ex. maybe 5ch = 2ch + 1ch + 1ch + 1ch = 4 streams) */
switch(stream_mode) {
case 0 : streams = (channels + 1) / 2; break;
case 1 : streams = channels; break;
default: return 0;
}
riff_size = 4+4+ 4 + 0x14 + 0x14*streams + 4+4;
@ -79,9 +87,24 @@ int ffmpeg_make_riff_xma1(uint8_t * buf, size_t buf_size, size_t sample_count, s
uint32_t speakers;
off_t off = 0x20 + 0x14*i;/* stream riff offset */
if (stream_mode == 1) {
/* lineal */
stream_channels = 1;
switch(i) { /* per stream, values observed */
case 0: speakers = 0x0001; break;/* L */
case 1: speakers = 0x0002; break;/* R */
case 2: speakers = 0x0004; break;/* C */
case 3: speakers = 0x0008; break;/* LFE */
case 4: speakers = 0x0040; break;/* LB */
case 5: speakers = 0x0080; break;/* RB */
case 6: speakers = 0x0000; break;/* ? */
case 7: speakers = 0x0000; break;/* ? */
default: speakers = 0;
}
}
else {
/* with odd channels the last stream is mono */
stream_channels = channels / streams + (channels%2 != 0 && i+1 != streams ? 1 : 0);
VGM_LOG("sch=%i, %i, %i\n", stream_channels, channels / streams, (channels%2 != 0 && i+1 != streams ? 1 : 0));
switch(i) { /* per stream, values from xmaencode */
case 0: speakers = stream_channels == 1 ? 0x0001 : 0x0201; break;/* L R */
case 1: speakers = stream_channels == 1 ? 0x0004 : 0x0804; break;/* C LFE */
@ -89,6 +112,7 @@ int ffmpeg_make_riff_xma1(uint8_t * buf, size_t buf_size, size_t sample_count, s
case 3: speakers = stream_channels == 1 ? 0x0000 : 0x0000; break;/* somehow empty (maybe should use 0x2010 LS RS) */
default: speakers = 0;
}
}
put_32bitLE(buf+off+0x00, sample_rate*stream_channels / sizeof(sample)); /* average bytes per second (wrong, unneeded) */
put_32bitLE(buf+off+0x04, sample_rate);

2
src/meta/xwb.c
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@ -277,7 +277,7 @@ VGMSTREAM * init_vgmstream_xwb(STREAMFILE *streamFile) {
uint8_t buf[100];
int bytes;
bytes = ffmpeg_make_riff_xma1(buf, 100, vgmstream->num_samples, xwb.stream_size, vgmstream->channels, vgmstream->sample_rate);
bytes = ffmpeg_make_riff_xma1(buf, 100, vgmstream->num_samples, xwb.stream_size, vgmstream->channels, vgmstream->sample_rate, 0);
if (bytes <= 0) goto fail;
ffmpeg_data = init_ffmpeg_header_offset(streamFile, buf,bytes, xwb.stream_offset,xwb.stream_size);