Signed-off-by: Zane van Iperen <z...@zanevaniperen.com>
---
libavcodec/adpcm.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index d0807cbd98..7f2c958d16 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -1698,6 +1698,16 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
void *data,
case AV_CODEC_ID_ADPCM_IMA_AMV:
av_assert0(avctx->channels == 1);
+ /*
+ * Header format:
+ * int16_t predictor;
+ * uint8_t step_index;
+ * uint8_t reserved;
+ * uint32_t frame_size;
+ *
+ * Some implementations have step_index as 16-bits, but others
+ * only use the lower 8 and store garbage in the upper 8.
+ */
c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
c->status[0].step_index = bytestream2_get_byteu(&gb);
bytestream2_skipu(&gb, 5);
--
2.28.0
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