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ffmpeg: add -guess_layout_max option.

This commit is contained in:
Nicolas George 2012-12-31 15:20:25 +01:00
parent 9648e1495b
commit fccd8c21c4
4 changed files with 15 additions and 0 deletions
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6
doc/ffmpeg.texi
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@ -611,6 +611,12 @@ This is an alias for @code{-filter:a}, see the @ref{filter_option,,-filter optio
Force audio tag/fourcc. This is an alias for @code{-tag:a}.
@item -absf @var{bitstream_filter}
Deprecated, see -bsf
@item -guess_layout_max @var{channels} (@emph{input,per-stream})
If some input channel layout is not known, try to guess only if it
corresponds to at most the specified number of channels. For example, 2
tells to @command{ffmpeg} to recognize 1 channel as mono and 2 channels as
stereo but not 6 channels as 5.1. The default is to always try to guess. Use
0 to disable all guessing.
@end table
@section Subtitle options:

2
ffmpeg.c
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@ -1443,6 +1443,8 @@ int guess_input_channel_layout(InputStream *ist)
if (!dec->channel_layout) {
char layout_name[256];
if (dec->channels > ist->guess_layout_max)
return 0;
dec->channel_layout = av_get_default_channel_layout(dec->channels);
if (!dec->channel_layout)
return 0;

3
ffmpeg.h
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@ -171,6 +171,8 @@ typedef struct OptionsContext {
int nb_pass;
SpecifierOpt *passlogfiles;
int nb_passlogfiles;
SpecifierOpt *guess_layout_max;
int nb_guess_layout_max;
} OptionsContext;
typedef struct InputFilter {
@ -229,6 +231,7 @@ typedef struct InputStream {
AVDictionary *opts;
AVRational framerate; /* framerate forced with -r */
int top_field_first;
int guess_layout_max;
int resample_height;
int resample_width;

4
ffmpeg_opt.c
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@ -616,6 +616,8 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
break;
case AVMEDIA_TYPE_AUDIO:
ist->guess_layout_max = INT_MAX;
MATCH_PER_STREAM_OPT(guess_layout_max, i, ist->guess_layout_max, ic, st);
guess_input_channel_layout(ist);
ist->resample_sample_fmt = dec->sample_fmt;
@ -2581,6 +2583,8 @@ const OptionDef options[] = {
"set channel layout", "layout" },
{ "af", OPT_AUDIO | HAS_ARG | OPT_PERFILE, { .func_arg = opt_audio_filters },
"set audio filters", "filter_graph" },
{ "guess_layout_max", OPT_AUDIO | HAS_ARG | OPT_INT | OPT_SPEC | OPT_EXPERT, { .off = OFFSET(guess_layout_max) },
"set the maximum number of channels to try to guess the channel layout" },
/* subtitle options */
{ "sn", OPT_SUBTITLE | OPT_BOOL | OPT_OFFSET, { .off = OFFSET(subtitle_disable) },