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ac3: implement request_channel_layout.

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Signed-off-by: Diego Biurrun <diego@biurrun.de>
This commit is contained in:
Tim Walker 2013-11-22 17:25:48 +01:00 committed by Diego Biurrun
parent c16bfb147d
commit b532854622
2 changed files with 41 additions and 13 deletions
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20
libavcodec/aac_ac3_parser.c
View File

@ -20,6 +20,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "parser.h"
#include "aac_ac3_parser.h"
@ -83,9 +84,22 @@ get_next:
avctx->sample_rate = s->sample_rate;
/* (E-)AC-3: allow downmixing to stereo or mono */
if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
avctx->request_channels < s->channels) {
avctx->channels = avctx->request_channels;
#if FF_API_REQUEST_CHANNELS
FF_DISABLE_DEPRECATION_WARNINGS
if (avctx->request_channels == 1)
avctx->request_channel_layout = AV_CH_LAYOUT_MONO;
else if (avctx->request_channels == 2)
avctx->request_channel_layout = AV_CH_LAYOUT_STEREO;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (s->channels > 1 &&
avctx->request_channel_layout == AV_CH_LAYOUT_MONO) {
avctx->channels = 1;
avctx->channel_layout = AV_CH_LAYOUT_MONO;
} else if (s->channels > 2 &&
avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {
avctx->channels = 2;
avctx->channel_layout = AV_CH_LAYOUT_STEREO;
} else {
avctx->channels = s->channels;
avctx->channel_layout = s->channel_layout;

34
libavcodec/ac3dec.c
View File

@ -29,6 +29,7 @@
#include <math.h>
#include <string.h>
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/opt.h"
#include "internal.h"
@ -178,10 +179,20 @@ static av_cold int ac3_decode_init(AVCodecContext *avctx)
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
/* allow downmixing to stereo or mono */
if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
avctx->request_channels < avctx->channels) {
avctx->channels = avctx->request_channels;
}
#if FF_API_REQUEST_CHANNELS
FF_DISABLE_DEPRECATION_WARNINGS
if (avctx->request_channels == 1)
avctx->request_channel_layout = AV_CH_LAYOUT_MONO;
else if (avctx->request_channels == 2)
avctx->request_channel_layout = AV_CH_LAYOUT_STEREO;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (avctx->channels > 1 &&
avctx->request_channel_layout == AV_CH_LAYOUT_MONO)
avctx->channels = 1;
else if (avctx->channels > 2 &&
avctx->request_channel_layout == AV_CH_LAYOUT_STEREO)
avctx->channels = 2;
s->downmixed = 1;
for (i = 0; i < AC3_MAX_CHANNELS; i++) {
@ -1348,14 +1359,17 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data,
s->output_mode = s->channel_mode;
if (s->lfe_on)
s->output_mode |= AC3_OUTPUT_LFEON;
if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
avctx->request_channels < s->channels) {
s->out_channels = avctx->request_channels;
s->output_mode = avctx->request_channels == 1 ? AC3_CHMODE_MONO : AC3_CHMODE_STEREO;
s->channel_layout = avpriv_ac3_channel_layout_tab[s->output_mode];
if (s->channels > 1 &&
avctx->request_channel_layout == AV_CH_LAYOUT_MONO) {
s->out_channels = 1;
s->output_mode = AC3_CHMODE_MONO;
} else if (s->channels > 2 &&
avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {
s->out_channels = 2;
s->output_mode = AC3_CHMODE_STEREO;
}
avctx->channels = s->out_channels;
avctx->channel_layout = s->channel_layout;
avctx->channel_layout = avpriv_ac3_channel_layout_tab[s->output_mode];
/* set downmixing coefficients if needed */
if (s->channels != s->out_channels && !((s->output_mode & AC3_OUTPUT_LFEON) &&