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Code Issues Releases Activity

Add channel layouts for dca.

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Originally committed as revision 15765 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Benjamin Larsson 2008-11-01 20:27:05 +00:00
parent b215365817
commit 87c3b9bce3
1 changed files with 57 additions and 0 deletions
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57
libavcodec/dca.c
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@ -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
@ -1165,7 +1211,17 @@ static int dca_decode_frame(AVCodecContext * avctx,
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
@ -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,
};