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| author | Calcium <calcium@nurs.or.jp> | 2005-03-23 01:59:17 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2005-03-23 01:59:17 +0000 |
| commit | 7e987c33ff664ea9672397d3721ad10374ce4858 (patch) | |
| tree | 41e1d3be3fccfa1a84024a65a0c37b403dac711e | |
| parent | ca80810bd9e94ea6b55451333d5890ebd7e2b27b (diff) | |
| download | ffmpeg-7e987c33ff664ea9672397d3721ad10374ce4858.tar.gz | |
19_audio_volume_adj.patch by (Calcium | calcium nurs or jp)
Originally committed as revision 4065 to svn://svn.ffmpeg.org/ffmpeg/trunk
| -rw-r--r-- | ffmpeg.c | 17 |
1 files changed, 17 insertions, 0 deletions
@@ -254,6 +254,7 @@ static char *video_standard = "ntsc"; static char *audio_grab_format = "audio_device"; static char *audio_device = NULL; +static int audio_volume = 100; // static int using_stdin = 0; static int using_vhook = 0; @@ -1209,6 +1210,21 @@ static int output_packet(AVInputStream *ist, int ist_index, &buffer_to_free); } + // preprocess audio (volume) + if (ist->st->codec.codec_type == CODEC_TYPE_AUDIO) { + if (audio_volume != 100) { + short *volp; + int v; + volp = samples; + for(i=0;i<(data_size / sizeof(short));i++) { + v = (*volp) * audio_volume / 100; + if (v < -32768) v = -32768; + if (v > 32767) v = 32767; + *volp++ = v; + } + } + } + /* frame rate emulation */ if (ist->st->codec.rate_emu) { int64_t pts = av_rescale((int64_t) ist->frame * ist->st->codec.frame_rate_base, 1000000, ist->st->codec.frame_rate); @@ -4075,6 +4091,7 @@ const OptionDef options[] = { { "an", OPT_BOOL | OPT_AUDIO, {(void*)&audio_disable}, "disable audio" }, { "acodec", HAS_ARG | OPT_AUDIO, {(void*)opt_audio_codec}, "force audio codec ('copy' to copy stream)", "codec" }, { "atag", HAS_ARG | OPT_EXPERT | OPT_AUDIO, {(void*)opt_audio_tag}, "force audio tag/fourcc", "fourcc/tag" }, + { "vol", OPT_INT | HAS_ARG | OPT_AUDIO, {(void*)&audio_volume}, "change audio volume (100=normal)" , "volume" }, // /* grab options */ { "vd", HAS_ARG | OPT_EXPERT | OPT_VIDEO | OPT_GRAB, {(void*)opt_video_device}, "set video grab device", "device" }, |