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| author | Michael Niedermayer <michaelni@gmx.at> | 2005-03-23 02:10:23 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2005-03-23 02:10:23 +0000 |
| commit | a9aa346717e09328580a95c54f0a1ea1383b7505 (patch) | |
| tree | 99fc88c142ffac85ce0a321f02abd2dfad48166f /ffmpeg.c | |
| parent | 7e987c33ff664ea9672397d3721ad10374ce4858 (diff) | |
| download | ffmpeg-a9aa346717e09328580a95c54f0a1ea1383b7505.tar.gz | |
change audio volume range so that the very slow division by 100 can be avoided
alternatively we could also use a nicer default = 100 or 1.0 scale and internally change it (patch welcome)
Originally committed as revision 4066 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'ffmpeg.c')
| -rw-r--r-- | ffmpeg.c | 9 |
1 files changed, 4 insertions, 5 deletions
@@ -254,7 +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 audio_volume = 256; static int using_stdin = 0; static int using_vhook = 0; @@ -1212,12 +1212,11 @@ static int output_packet(AVInputStream *ist, int ist_index, // preprocess audio (volume) if (ist->st->codec.codec_type == CODEC_TYPE_AUDIO) { - if (audio_volume != 100) { + if (audio_volume != 256) { short *volp; - int v; volp = samples; for(i=0;i<(data_size / sizeof(short));i++) { - v = (*volp) * audio_volume / 100; + int v = ((*volp) * audio_volume + 128) >> 8; if (v < -32768) v = -32768; if (v > 32767) v = 32767; *volp++ = v; @@ -4091,7 +4090,7 @@ 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" }, // + { "vol", OPT_INT | HAS_ARG | OPT_AUDIO, {(void*)&audio_volume}, "change audio volume (256=normal)" , "volume" }, // /* grab options */ { "vd", HAS_ARG | OPT_EXPERT | OPT_VIDEO | OPT_GRAB, {(void*)opt_video_device}, "set video grab device", "device" }, |