adpcm: fix nb_samples rounding for adpcm_ima_dk3, and update reference.

libavcodec/adpcm.c

@@ -448,7 +448,7 @@ static int get_nb_samples(AVCodecContext *avctx, const uint8_t *buf,
     case CODEC_ID_ADPCM_IMA_DK3:
         if (avctx->block_align > 0)
             buf_size = FFMIN(buf_size, avctx->block_align);
-        nb_samples = ((buf_size - 16) * 8 / 3) / ch;
+        nb_samples = ((buf_size - 16) * 2 / 3 * 4) / ch;
         break;
     case CODEC_ID_ADPCM_IMA_DK4:
         nb_samples = 1 + (buf_size - 4 * ch) * 2 / ch;

libavcodec/utils.c

@@ -1859,7 +1859,7 @@ int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
                 case CODEC_ID_ADPCM_IMA_WAV:
                     return blocks * (1 + (ba - 4 * ch) / (4 * ch) * 8);
                 case CODEC_ID_ADPCM_IMA_DK3:
-                    return blocks * (((ba - 16) * 8 / 3) / ch);
+                    return blocks * (((ba - 16) * 2 / 3 * 4) / ch);
                 case CODEC_ID_ADPCM_IMA_DK4:
                     return blocks * (1 + (ba - 4 * ch) * 2 / ch);
                 case CODEC_ID_ADPCM_MS:

tests/ref/fate/adpcm-ima-dk3

-bb952ae86c72d461aef7583685ec0a4d
+62fbe4db4a49cb044f57f92cce9993c5

tests/ref/fate/truemotion1-24

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