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adpcm_swf: Use correct sample offsets when using trellis.

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Fixes invalid reads when encoding mono streams when trellis is used.
This commit is contained in:
Justin Ruggles 2012-08-20 12:18:58 -04:00
parent 7011a42b1a
commit 5d4ef004bf
1 changed files with 4 additions and 3 deletions
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7
libavcodec/adpcmenc.c
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@ -615,10 +615,11 @@ static int adpcm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
if (avctx->trellis > 0) {
FF_ALLOC_OR_GOTO(avctx, buf, 2 * n, error);
adpcm_compress_trellis(avctx, samples + 2, buf, &c->status[0], n);
adpcm_compress_trellis(avctx, samples + avctx->channels, buf,
&c->status[0], n);
if (avctx->channels == 2)
adpcm_compress_trellis(avctx, samples + 3, buf + n,
&c->status[1], n);
adpcm_compress_trellis(avctx, samples + avctx->channels + 1,
buf + n, &c->status[1], n);
for (i = 0; i < n; i++) {
put_bits(&pb, 4, buf[i]);
if (avctx->channels == 2)