---
libavcodec/adpcm.c | 20 +++++++++++---------
1 files changed, 11 insertions(+), 9 deletions(-)
diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index 4ee71b2..9307388 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -450,6 +450,8 @@ static int get_nb_samples(AVCodecContext *avctx, const
uint8_t *buf,
nb_samples = ((buf_size - 16) * 8 / 3) / ch;
break;
case CODEC_ID_ADPCM_IMA_DK4:
+ if (avctx->block_align > 0)
+ buf_size = FFMIN(buf_size, avctx->block_align);
nb_samples = 1 + (buf_size - 4 * ch) * 2 / ch;
break;
case CODEC_ID_ADPCM_IMA_WAV:
@@ -713,18 +715,18 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void
*data,
break;
}
case CODEC_ID_ADPCM_IMA_DK4:
- if (avctx->block_align != 0 && buf_size > avctx->block_align)
- buf_size = avctx->block_align;
-
for (channel = 0; channel < avctx->channels; channel++) {
cs = &c->status[channel];
- cs->predictor = (int16_t)bytestream_get_le16(&src);
- cs->step_index = av_clip(*src++, 0, 88);
- src++;
- *samples++ = cs->predictor;
+ cs->predictor = *samples++ =
sign_extend(bytestream2_get_le16u(&gb), 16);
+ cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
+ if (cs->step_index > 88u){
+ av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
+ channel, cs->step_index);
+ return AVERROR_INVALIDDATA;
+ }
}
- for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
- uint8_t v = *src;
+ for (n = nb_samples >> (1 - st); n > 0; n--) {
+ int v = bytestream2_get_byteu(&gb);
*samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4 , 3);
*samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
}
--
1.7.2.1
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