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ffplay: honor SDL_AUDIO_CHANNELS and make sure to use SDL supported number of audio channels 

Fixes ticket #838.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2012-01-04 03:01:35 +01:00
parent 4452d58c72
commit 5d94f28e9e
1 changed files with 15 additions and 2 deletions
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13
ffplay.c
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@ -2221,6 +2221,8 @@ static int stream_component_open(VideoState *is, int stream_index)
AVDictionary *opts;
AVDictionaryEntry *t = NULL;
int64_t wanted_channel_layout = 0;
int wanted_nb_channels;
const char *env;
if (stream_index < 0 || stream_index >= ic->nb_streams)
return -1;
@ -2257,8 +2259,19 @@ static int stream_component_open(VideoState *is, int stream_index)
avctx->flags |= CODEC_FLAG_EMU_EDGE;
if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
env = SDL_getenv("SDL_AUDIO_CHANNELS");
if (env)
wanted_channel_layout = av_get_default_channel_layout(SDL_atoi(env));
if (!wanted_channel_layout) {
wanted_channel_layout = (avctx->channel_layout && avctx->channels == av_get_channel_layout_nb_channels(avctx->channels)) ? avctx->channel_layout : av_get_default_channel_layout(avctx->channels);
wanted_channel_layout &= ~AV_CH_LAYOUT_STEREO_DOWNMIX;
wanted_nb_channels = av_get_channel_layout_nb_channels(wanted_channel_layout);
/* SDL only supports 1, 2, 4 or 6 channels at the moment, so we have to make sure not to request anything else. */
while (wanted_nb_channels > 0 && (wanted_nb_channels == 3 || wanted_nb_channels == 5 || wanted_nb_channels > 6)) {
wanted_nb_channels--;
wanted_channel_layout = av_get_default_channel_layout(wanted_nb_channels);
}
}
wanted_spec.channels = av_get_channel_layout_nb_channels(wanted_channel_layout);
wanted_spec.freq = avctx->sample_rate;
if (wanted_spec.freq <= 0 || wanted_spec.channels <= 0) {