[FFmpeg-cvslog] r15765 - trunk/libavcodec/dca.c

[banan]

Author: banan
Date: Sat Nov  1 21:27:05 2008
New Revision: 15765

Log:
Add channel layouts for dca.


Modified:
   trunk/libavcodec/dca.c

Modified: trunk/libavcodec/dca.c
==============================================================================
--- trunk/libavcodec/dca.c	(original)
+++ trunk/libavcodec/dca.c	Sat Nov  1 21:27:05 2008
@@ -59,6 +59,52 @@ enum DCAMode {
     DCA_4F2R
 };
 
+/* Tables for mapping dts channel configurations to libavcodec multichannel api.
+ * Some compromises have been made for special configurations. Most configurations
+ * are never used so complete accuracy is not needed.
+ *
+ * L = left, R = right, C = center, S = surround, F = front, R = rear, T = total, OV = overhead.
+ * S  -> back, when both rear and back are configured move one of them to the side channel
+ * OV -> center back
+ * All 2 channel configurations -> CHANNEL_LAYOUT_STEREO
+ */
+
+static const int64_t dca_core_channel_layout[] = {
+    CHANNEL_FRONT_CENTER,                                               ///< 1, A
+    CHANNEL_LAYOUT_STEREO,                                              ///< 2, A + B (dual mono)
+    CHANNEL_LAYOUT_STEREO,                                              ///< 2, L + R (stereo)
+    CHANNEL_LAYOUT_STEREO,                                              ///< 2, (L+R) + (L-R) (sum-difference)
+    CHANNEL_LAYOUT_STEREO,                                              ///< 2, LT +RT (left and right total)
+    CHANNEL_LAYOUT_STEREO|CHANNEL_FRONT_CENTER,                         ///< 3, C+L+R
+    CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_CENTER,                          ///< 3, L+R+S
+    CHANNEL_LAYOUT_STEREO|CHANNEL_FRONT_CENTER|CHANNEL_BACK_CENTER,     ///< 4, C + L + R+ S
+    CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT,         ///< 4, L + R+ SL+SR
+    CHANNEL_LAYOUT_STEREO|CHANNEL_FRONT_CENTER|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT,                                       ///< 5, C + L + R+ SL+SR
+    CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT|CHANNEL_FRONT_LEFT_OF_CENTER|CHANNEL_FRONT_RIGHT_OF_CENTER, ///< 6, CL + CR + L + R + SL + SR
+    CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT|CHANNEL_FRONT_CENTER|CHANNEL_BACK_CENTER,                   ///< 6, C + L + R+ LR + RR + OV
+    CHANNEL_FRONT_CENTER|CHANNEL_FRONT_RIGHT_OF_CENTER|CHANNEL_FRONT_LEFT_OF_CENTER|CHANNEL_BACK_CENTER|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT,  ///< 6, CF+ CR+LF+ RF+LR + RR
+    CHANNEL_FRONT_LEFT_OF_CENTER|CHANNEL_FRONT_CENTER|CHANNEL_FRONT_RIGHT_OF_CENTER|CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT, ///< 7, CL + C + CR + L + R + SL + SR
+    CHANNEL_FRONT_LEFT_OF_CENTER|CHANNEL_FRONT_RIGHT_OF_CENTER|CHANNEL_LAYOUT_STEREO|CHANNEL_SIDE_LEFT|CHANNEL_SIDE_RIGHT|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT, ///< 8, CL + CR + L + R + SL1 + SL2+ SR1 + SR2
+    CHANNEL_FRONT_LEFT_OF_CENTER|CHANNEL_FRONT_CENTER|CHANNEL_FRONT_RIGHT_OF_CENTER|CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_LEFT|CHANNEL_BACK_CENTER|CHANNEL_BACK_RIGHT, ///< 8, CL + C+ CR + L + R + SL + S+ SR
+
+    /* The following entries adds the LFE layouts, this way we can reuse the table for the AVCodec channel_layouts member*/
+    CHANNEL_FRONT_CENTER|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_LAYOUT_STEREO|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_LAYOUT_STEREO|CHANNEL_FRONT_CENTER|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_CENTER|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_LAYOUT_STEREO|CHANNEL_FRONT_CENTER|CHANNEL_BACK_CENTER|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_LAYOUT_STEREO|CHANNEL_FRONT_CENTER|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT|CHANNEL_FRONT_LEFT_OF_CENTER|CHANNEL_FRONT_RIGHT_OF_CENTER|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT|CHANNEL_FRONT_CENTER|CHANNEL_BACK_CENTER|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_FRONT_CENTER|CHANNEL_FRONT_RIGHT_OF_CENTER|CHANNEL_FRONT_LEFT_OF_CENTER|CHANNEL_BACK_CENTER|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_FRONT_LEFT_OF_CENTER|CHANNEL_FRONT_CENTER|CHANNEL_FRONT_RIGHT_OF_CENTER|CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_FRONT_LEFT_OF_CENTER|CHANNEL_FRONT_RIGHT_OF_CENTER|CHANNEL_LAYOUT_STEREO|CHANNEL_SIDE_LEFT|CHANNEL_SIDE_RIGHT|CHANNEL_BACK_LEFT|CHANNEL_BACK_RIGHT|CHANNEL_LOW_FREQUENCY,
+    CHANNEL_FRONT_LEFT_OF_CENTER|CHANNEL_FRONT_CENTER|CHANNEL_FRONT_RIGHT_OF_CENTER|CHANNEL_LAYOUT_STEREO|CHANNEL_BACK_LEFT|CHANNEL_BACK_CENTER|CHANNEL_BACK_RIGHT|CHANNEL_LOW_FREQUENCY,
+    0,
+};
+
+
 #define DCA_DOLBY 101           /* FIXME */
 
 #define DCA_CHANNEL_BITS 6
@@ -1165,8 +1211,18 @@ static int dca_decode_frame(AVCodecConte
     if(avctx->request_channels == 2 && s->prim_channels > 2) {
         channels = 2;
         s->output = DCA_STEREO;
+        avctx->channel_layout = CHANNEL_LAYOUT_STEREO;
+    }
+    if (s->amode<16)
+        avctx->channel_layout = dca_core_channel_layout[s->amode];
+    else {
+        av_log(avctx, AV_LOG_ERROR, "Custom channel layouts not supported\n");
+        //Maybe just guess layout depending on the channel count
+        return -1;
     }
 
+    if (s->lfe) avctx->channel_layout |= CHANNEL_LOW_FREQUENCY;
+
     /* There is nothing that prevents a dts frame to change channel configuration
        but FFmpeg doesn't support that so only set the channels if it is previously
        unset. Ideally during the first probe for channels the crc should be checked
@@ -1244,4 +1300,5 @@ AVCodec dca_decoder = {
     .decode = dca_decode_frame,
     .close = dca_decode_end,
     .long_name = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),
+    .channel_layouts = dca_core_channel_layout,
 };