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libvorbis: use VBR by default, with default quality of 3

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This commit is contained in:
Justin Ruggles 2012-02-28 19:33:07 -05:00
parent 182d4f1f38
commit 147ff24a0e
1 changed files with 12 additions and 2 deletions
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14
libavcodec/libvorbis.c
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@ -61,6 +61,12 @@ static const AVOption options[] = {
{ "iblock", "Sets the impulse block bias", offsetof(OggVorbisContext, iblock), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, -15, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
{ NULL }
};
static const AVCodecDefault defaults[] = {
{ "b", "0" },
{ NULL },
};
static const AVClass class = { "libvorbis", av_default_item_name, options, LIBAVUTIL_VERSION_INT };
@ -81,12 +87,15 @@ static av_cold int oggvorbis_init_encoder(vorbis_info *vi,
double cfreq;
int ret;
if (avctx->flags & CODEC_FLAG_QSCALE) {
if (avctx->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) {
/* variable bitrate
* NOTE: we use the oggenc range of -1 to 10 for global_quality for
* user convenience, but libvorbis uses -0.1 to 1.0
* user convenience, but libvorbis uses -0.1 to 1.0.
*/
float q = avctx->global_quality / (float)FF_QP2LAMBDA;
/* default to 3 if the user did not set quality or bitrate */
if (!(avctx->flags & CODEC_FLAG_QSCALE))
q = 3.0;
if ((ret = vorbis_encode_setup_vbr(vi, avctx->channels,
avctx->sample_rate,
q / 10.0)))
@ -307,4 +316,5 @@ AVCodec ff_libvorbis_encoder = {
AV_SAMPLE_FMT_NONE },
.long_name = NULL_IF_CONFIG_SMALL("libvorbis Vorbis"),
.priv_class = &class,
.defaults = defaults,
};