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avconv: parse channel layout string

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This allows the user to use channel layout names instead of having to use the
channel mask values.
This commit is contained in:
Justin Ruggles 2012-04-05 17:47:20 -04:00
parent a559d65c07
commit 95a8dac57b
1 changed files with 36 additions and 0 deletions
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36
avconv.c
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@ -4377,6 +4377,41 @@ static void parse_cpuflags(int argc, char **argv, const OptionDef *options)
opt_cpuflags("cpuflags", argv[idx + 1]);
}
static int opt_channel_layout(OptionsContext *o, const char *opt, const char *arg)
{
char layout_str[32];
char *stream_str;
char *ac_str;
int ret, channels, ac_str_size;
uint64_t layout;
layout = av_get_channel_layout(arg);
if (!layout) {
av_log(NULL, AV_LOG_ERROR, "Unknown channel layout: %s\n", arg);
return AVERROR(EINVAL);
}
snprintf(layout_str, sizeof(layout_str), "%"PRIu64, layout);
ret = opt_default(opt, layout_str);
if (ret < 0)
return ret;
/* set 'ac' option based on channel layout */
channels = av_get_channel_layout_nb_channels(layout);
snprintf(layout_str, sizeof(layout_str), "%d", channels);
stream_str = strchr(opt, ':');
ac_str_size = 3 + (stream_str ? strlen(stream_str) : 0);
ac_str = av_mallocz(ac_str_size);
if (!ac_str)
return AVERROR(ENOMEM);
av_strlcpy(ac_str, "ac", 3);
if (stream_str)
av_strlcat(ac_str, stream_str, ac_str_size);
ret = parse_option(o, ac_str, layout_str, options);
av_free(ac_str);
return ret;
}
#define OFFSET(x) offsetof(OptionsContext, x)
static const OptionDef options[] = {
/* main options */
@ -4465,6 +4500,7 @@ static const OptionDef options[] = {
{ "atag", HAS_ARG | OPT_EXPERT | OPT_AUDIO | OPT_FUNC2, {(void*)opt_audio_tag}, "force audio tag/fourcc", "fourcc/tag" },
{ "vol", OPT_INT | HAS_ARG | OPT_AUDIO, {(void*)&audio_volume}, "change audio volume (256=normal)" , "volume" }, //
{ "sample_fmt", HAS_ARG | OPT_EXPERT | OPT_AUDIO | OPT_SPEC | OPT_STRING, {.off = OFFSET(sample_fmts)}, "set sample format", "format" },
{ "channel_layout", HAS_ARG | OPT_EXPERT | OPT_AUDIO | OPT_FUNC2, {(void*)opt_channel_layout}, "set channel layout", "layout" },
/* subtitle options */
{ "sn", OPT_BOOL | OPT_SUBTITLE | OPT_OFFSET, {.off = OFFSET(subtitle_disable)}, "disable subtitle" },