[FFmpeg-devel] [PATCH v2 2/5] avcodec/adpcm_ima_amv: handle odd sample counts

Zane van Iperen zane at zanevaniperen.com
Tue Nov 3 02:38:15 EET 2020


Signed-off-by: Zane van Iperen <zane at zanevaniperen.com>
---
 libavcodec/adpcm.c           |  25 ++-
 tests/ref/fate/adpcm-ima-amv | 312 +++++++++++++++++------------------
 2 files changed, 180 insertions(+), 157 deletions(-)

diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index d34fd6c6e1..d0807cbd98 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -775,7 +775,6 @@ static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
         case AV_CODEC_ID_ADPCM_IMA_DAT4:
         case AV_CODEC_ID_ADPCM_IMA_MOFLEX:
         case AV_CODEC_ID_ADPCM_IMA_ISS:     header_size = 4 * ch;      break;
-        case AV_CODEC_ID_ADPCM_IMA_AMV:     header_size = 8;           break;
         case AV_CODEC_ID_ADPCM_IMA_SMJPEG:  header_size = 4 * ch;      break;
     }
     if (header_size > 0)
@@ -783,6 +782,18 @@ static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
 
     /* more complex formats */
     switch (avctx->codec->id) {
+    case AV_CODEC_ID_ADPCM_IMA_AMV:
+        bytestream2_skip(gb, 4);
+
+        has_coded_samples  = 1;
+        *coded_samples     = bytestream2_get_le32u(gb);
+        nb_samples         = (buf_size - 8) * 2;
+
+        if (*coded_samples == nb_samples - 1)
+            nb_samples = *coded_samples;
+
+        bytestream2_seek(gb, -8, SEEK_CUR);
+        break;
     case AV_CODEC_ID_ADPCM_EA:
         has_coded_samples = 1;
         *coded_samples  = bytestream2_get_le32(gb);
@@ -1690,6 +1701,13 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
         c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
         c->status[0].step_index = bytestream2_get_byteu(&gb);
         bytestream2_skipu(&gb, 5);
+
+        if (nb_samples & 1 && buf[buf_size - 1] & 0x0F) {
+            /* Holds true on all the http://samples.mplayerhq.hu/amv samples. */
+            av_log(avctx, AV_LOG_WARNING, "Last nibble set on packet with odd sample count.\n");
+            av_log(avctx, AV_LOG_WARNING, "Sample will be skipped.\n");
+        }
+
         if (c->status[0].step_index > 88u) {
             av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",
                    c->status[0].step_index);
@@ -1702,6 +1720,11 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);
             *samples++ = adpcm_ima_expand_nibble(&c->status[0], v & 0xf, 3);
         }
+
+        if (nb_samples & 1) {
+            int v = bytestream2_get_byteu(&gb);
+            *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);
+        }
         break;
     case AV_CODEC_ID_ADPCM_IMA_SMJPEG:
         for (i = 0; i < avctx->channels; i++) {
diff --git a/tests/ref/fate/adpcm-ima-amv b/tests/ref/fate/adpcm-ima-amv
index eb174dfa81..2f8c0a2cdf 100644
--- a/tests/ref/fate/adpcm-ima-amv
+++ b/tests/ref/fate/adpcm-ima-amv
@@ -8,159 +8,159 @@
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+0,     219124,     219124,     1376,     2752, 0x2c374add
-- 
2.28.0




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