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Fix XWMA with buggy bit rates [Saints Row 2 (PC)]

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bnnm 2018-10-07 03:26:31 +02:00
parent 65aca53cb5
commit a63dd9eae0
1 changed files with 30 additions and 1 deletions
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31
src/coding/coding_utils.c
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@ -328,6 +328,35 @@ int ffmpeg_make_riff_xwma(uint8_t * buf, size_t buf_size, int codec, size_t data
if (buf_size < riff_size)
return -1;
/* XWMA encoder only allows a few channel/sample rate/bitrate combinations,
* but some create identical files with fake bitrate (1ch 22050hz at
* 20/48/192kbps are all 20kbps, with the exact same codec data).
* Decoder needs correct bitrate to work, so it's normalized here. */
/* (may be removed once FFmpeg fixes this) */
if (codec == 0x161) { /* WMAv2 only */
int ch = channels;
int sr = sample_rate;
int br = avg_bps * 8;
/* Must be a bug in MS's encoder, as later versions of xWMAEncode remove these bitrates */
if (ch == 1) {
if (sr == 22050 && (br==48000 || br==192000))
br = 20000;
else if (sr == 32000 && (br==48000 || br==192000))
br = 20000;
else if (sr == 44100 && (br==96000 || br==192000))
br = 48000;
}
else if (ch == 2) {
if (sr == 22050 && (br==48000 || br==192000))
br = 32000;
else if (sr == 32000 && (br==192000))
br = 48000;
}
avg_bps = br / 8;
}
memcpy(buf+0x00, "RIFF", 4);
put_32bitLE(buf+0x04, (int32_t)(riff_size-4-4 + data_size)); /* riff size */
memcpy(buf+0x08, "XWMA", 4);
@ -341,7 +370,7 @@ int ffmpeg_make_riff_xwma(uint8_t * buf, size_t buf_size, int codec, size_t data
put_16bitLE(buf+0x20, block_align); /* block align */
put_16bitLE(buf+0x22, 16); /* bits per sample */
put_16bitLE(buf+0x24, 0); /* extra size */
/* here goes the "dpds" table, but it's optional and not needed by FFmpeg */
/* here goes the "dpds" seek table, but it's optional and not needed by FFmpeg */
memcpy(buf+0x26, "data", 4);
put_32bitLE(buf+0x2a, data_size); /* data size */