Merge remote-tracking branch 'qatar/release/0.8' into release/0.10

* qatar/release/0.8:
  adpcm: Unbreak ima-dk4
  ac3dec: validate channel output mode against channel count
  dca: Respect the current limits in the downmixing capabilities

Merged-by: Michael Niedermayer <[email protected]>

2 files changed, 15 insertions, 6 deletions

diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index 8c94254cf9..9384dc7fbf 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -1373,8 +1373,10 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data,
     if (!err) {
         avctx->sample_rate = s->sample_rate;
         avctx->bit_rate    = s->bit_rate;
+    }
 
-        /* channel config */
+    /* channel config */
+    if (!err || (s->channels && s->out_channels != s->channels)) {
         s->out_channels = s->channels;
         s->output_mode  = s->channel_mode;
         if (s->lfe_on)
@@ -1397,18 +1399,18 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data,
                 s->fbw_channels == s->out_channels)) {
             set_downmix_coeffs(s);
         }
-    } else if (!s->out_channels) {
-        s->out_channels = avctx->channels;
-        if (s->out_channels < s->channels)
-            s->output_mode  = s->out_channels == 1 ? AC3_CHMODE_MONO : AC3_CHMODE_STEREO;
+    } else if (!s->channels) {
+        av_log(avctx, AV_LOG_ERROR, "unable to determine channel mode\n");
+        return AVERROR_INVALIDDATA;
     }
+    avctx->channels = s->out_channels;
+
     /* set audio service type based on bitstream mode for AC-3 */
     avctx->audio_service_type = s->bitstream_mode;
     if (s->bitstream_mode == 0x7 && s->channels > 1)
         avctx->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
 
     /* get output buffer */
-    avctx->channels = s->out_channels;
     s->frame.nb_samples = s->num_blocks * 256;
     if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
diff --git a/libavcodec/dca.c b/libavcodec/dca.c
index a442e7f06b..ea40821766 100644
--- a/libavcodec/dca.c
+++ b/libavcodec/dca.c
@@ -804,6 +804,13 @@ static int dca_subframe_header(DCAContext *s, int base_channel, int block_index)
                        "Invalid channel mode %d\n", am);
                 return AVERROR_INVALIDDATA;
             }
+
+            if (s->prim_channels > FF_ARRAY_ELEMS(dca_default_coeffs[0])) {
+                av_log_ask_for_sample(s->avctx, "Downmixing %d channels",
+                                      s->prim_channels);
+                return AVERROR_PATCHWELCOME;
+            }
+
             for (j = base_channel; j < s->prim_channels; j++) {
                 s->downmix_coef[j][0] = dca_default_coeffs[am][j][0];
                 s->downmix_coef[j][1] = dca_default_coeffs[am][j][1];