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adpcm: simplify packet size bounds checking in the ADPCM IMA QT decoder.

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This is easier to understand. It also avoids returning existing samples mixed
with new samples when the packet is too small.
This commit is contained in:
Justin Ruggles 2011-09-08 18:57:56 -04:00
parent de0b586a87
commit ac94b8bcc6
1 changed files with 7 additions and 2 deletions
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9
libavcodec/adpcm.c
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@ -379,7 +379,12 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
switch(avctx->codec->id) {
case CODEC_ID_ADPCM_IMA_QT:
n = buf_size - 2*avctx->channels;
/* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples).
Channel data is interleaved per-chunk. */
if (buf_size / 34 < avctx->channels) {
av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
return AVERROR(EINVAL);
}
for (channel = 0; channel < avctx->channels; channel++) {
int16_t predictor;
int step_index;
@ -412,7 +417,7 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
samples = (short*)data + channel;
for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
for (m = 0; m < 32; m++) {
*samples = adpcm_ima_qt_expand_nibble(cs, src[0] & 0x0F, 3);
samples += avctx->channels;
*samples = adpcm_ima_qt_expand_nibble(cs, src[0] >> 4 , 3);