[SCM] libav/experimental: enable multichannel output in dca decoder. reference: Subject: [Ffmpeg-devel] [PATCH] DTS multichannel Date: Wed, 25 Apr 2007 16:25:18 -0400
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 15:59:25 UTC 2013
The following commit has been merged in the experimental branch:
commit cc82662662f7575ffb717adb56c2f04a122eb20e
Author: Justin Ruggles <justin.ruggles at gmail.com>
Date: Wed May 2 20:31:32 2007 +0000
enable multichannel output in dca decoder.
reference:
Subject: [Ffmpeg-devel] [PATCH] DTS multichannel
Date: Wed, 25 Apr 2007 16:25:18 -0400
Originally committed as revision 8874 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/dca.c b/libavcodec/dca.c
index 1c040e2..5da609e 100644
--- a/libavcodec/dca.c
+++ b/libavcodec/dca.c
@@ -285,7 +285,8 @@ static int dca_parse_frame_header(DCAContext * s)
s->dialog_norm = get_bits(&s->gb, 4);
/* FIXME: channels mixing levels */
- s->output = DCA_STEREO;
+ s->output = s->amode;
+ if(s->lfe) s->output |= DCA_LFE;
#ifdef TRACE
av_log(s->avctx, AV_LOG_DEBUG, "frame type: %i\n", s->frame_type);
@@ -1143,10 +1144,25 @@ static int dca_decode_frame(AVCodecContext * avctx,
}
//set AVCodec values with parsed data
avctx->sample_rate = s->sample_rate;
- avctx->channels = 2; //FIXME
avctx->bit_rate = s->bit_rate;
- channels = dca_channels[s->output];
+ channels = s->prim_channels + !!s->lfe;
+ if(avctx->channels == 0) {
+ avctx->channels = channels;
+ } else if(channels < avctx->channels) {
+ av_log(avctx, AV_LOG_WARNING, "DTS source channels are less than "
+ "specified: output to %d channels.\n", channels);
+ avctx->channels = channels;
+ }
+ if(avctx->channels == 2) {
+ s->output = DCA_STEREO;
+ } else if(avctx->channels != channels) {
+ av_log(avctx, AV_LOG_ERROR, "Cannot downmix DTS to %d channels.\n",
+ avctx->channels);
+ return -1;
+ }
+
+ channels = avctx->channels;
if(*data_size < (s->sample_blocks / 8) * 256 * sizeof(int16_t) * channels)
return -1;
*data_size = 0;
--
Libav/FFmpeg packaging
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