avcodec/adpcm_ima_alp: reset state on flush

[ffmpeg] / libavcodec / adpcm.c

diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index 5c28b745b90ff2c7c11f50fe3ee887c6f87afdab..f154188b5d2c64f13ef94ba528dcdef444e6262d 100644 (file)
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -1811,11 +1811,6 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
         }
         break;
     case AV_CODEC_ID_ADPCM_AICA:
-        if (!c->has_status) {
-            for (channel = 0; channel < avctx->channels; channel++)
-                c->status[channel].step = 0;
-            c->has_status = 1;
-        }
         for (channel = 0; channel < avctx->channels; channel++) {
             samples = samples_p[channel];
             for (n = nb_samples >> 1; n > 0; n--) {
@@ -2077,13 +2072,6 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
         }
         break;
     case AV_CODEC_ID_ADPCM_ZORK:
-        if (!c->has_status) {
-            for (channel = 0; channel < avctx->channels; channel++) {
-                c->status[channel].predictor  = 0;
-                c->status[channel].step_index = 0;
-            }
-            c->has_status = 1;
-        }
         for (n = 0; n < nb_samples * avctx->channels; n++) {
             int v = bytestream2_get_byteu(&gb);
             *samples++ = adpcm_zork_expand_nibble(&c->status[n % avctx->channels], v);
@@ -2121,7 +2109,36 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
 static void adpcm_flush(AVCodecContext *avctx)
 {
     ADPCMDecodeContext *c = avctx->priv_data;
-    c->has_status = 0;
+
+    switch(avctx->codec_id) {
+    case AV_CODEC_ID_ADPCM_AICA:
+        for (int channel = 0; channel < avctx->channels; channel++)
+            c->status[channel].step = 0;
+        break;
+
+    case AV_CODEC_ID_ADPCM_ARGO:
+        for (int channel = 0; channel < avctx->channels; channel++) {
+            c->status[channel].sample1 = 0;
+            c->status[channel].sample2 = 0;
+        }
+        break;
+
+    case AV_CODEC_ID_ADPCM_IMA_ALP:
+    case AV_CODEC_ID_ADPCM_IMA_SSI:
+    case AV_CODEC_ID_ADPCM_ZORK:
+        for (int channel = 0; channel < avctx->channels; channel++) {
+            c->status[channel].predictor  = 0;
+            c->status[channel].step_index = 0;
+        }
+        break;
+
+    default:
+        /* Other codecs may want to handle this during decoding. */
+        c->has_status = 0;
+        return;
+    }
+
+    c->has_status = 1;
 }