[libav-devel] [PATCH 07/17] mlpdec: Parse TrueHD decoder channel modifiers and set the AVMatrixEncoding for each substream.

[Tim Walker]

---
 libavcodec/mlpdec.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/libavcodec/mlpdec.c b/libavcodec/mlpdec.c
index 4339b9d..4fe1bfa 100644
--- a/libavcodec/mlpdec.c
+++ b/libavcodec/mlpdec.c
@@ -60,6 +60,8 @@ typedef struct SubStream {
     uint8_t     ch_assign[MAX_CHANNELS];
     /// The channel layout for this substream
     uint64_t    ch_layout;
+    /// The matrix encoding mode for this substream
+    enum AVMatrixEncoding matrix_encoding;
 
     /// Channel coding parameters for channels in the substream
     ChannelParams channel_params[MAX_CHANNELS];
@@ -374,6 +376,54 @@ static int read_major_sync(MLPDecodeContext *m, 
GetBitContext *gb)
         m->substream[substr].ch_layout = mh.channel_layout_thd_stream1;
     }
 
+    /* Parse the TrueHD decoder channel modifiers and set each substream's
+     * AVMatrixEncoding accordingly.
+     *
+     * The meaning of the modifiers depends on the channel layout:
+     *
+     * - THD_CH_MODIFIER_LTRT, THD_CH_MODIFIER_LBINRBIN only apply to 2-channel
+     *
+     * - THD_CH_MODIFIER_MONO applies to 1-channel or 2-channel (dual mono)
+     *
+     * - THD_CH_MODIFIER_SURROUNDEX, THD_CH_MODIFIER_NOTSURROUNDEX only apply 
to
+     *   layouts with an Ls/Rs channel pair
+     */
+    for (substr = 0; substr < MAX_SUBSTREAMS; substr++)
+        m->substream[substr].matrix_encoding = AV_MATRIX_ENCODING_NONE;
+    if (m->avctx->codec_id == AV_CODEC_ID_TRUEHD) {
+        if (mh.num_substreams > 2 &&
+            mh.channel_layout_thd_stream2 & AV_CH_SIDE_LEFT &&
+            mh.channel_layout_thd_stream2 & AV_CH_SIDE_RIGHT)
+            switch (mh.channel_modifier_thd_stream2) {
+            case THD_CH_MODIFIER_SURROUNDEX:
+                m->substream[2].matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX;
+                break;
+            default:
+                break;
+            }
+        if (mh.num_substreams > 1 &&
+            mh.channel_layout_thd_stream1 & AV_CH_SIDE_LEFT &&
+            mh.channel_layout_thd_stream1 & AV_CH_SIDE_RIGHT)
+            switch (mh.channel_modifier_thd_stream1) {
+            case THD_CH_MODIFIER_SURROUNDEX:
+                m->substream[1].matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX;
+                break;
+            default:
+                break;
+            }
+        if (mh.num_substreams > 0)
+            switch (mh.channel_modifier_thd_stream0) {
+            case THD_CH_MODIFIER_LTRT:
+                m->substream[0].matrix_encoding = AV_MATRIX_ENCODING_DOLBY;
+                break;
+            case THD_CH_MODIFIER_LBINRBIN:
+                m->substream[0].matrix_encoding = 
AV_MATRIX_ENCODING_DOLBYHEADPHONE;
+                break;
+            default:
+                break;
+            }
+    }
+
     return 0;
 }
 
-- 
1.8.3.4 (Apple Git-47)

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