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Support constant-quant encoding for libtheora

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Based on a patch by j f (gonzaz-z # operamail (d) com)

Originally committed as revision 20109 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad 2009-09-30 22:25:49 +00:00
parent 7cee5421d6
commit 6945c2bc4c
1 changed files with 13 additions and 2 deletions
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15
libavcodec/libtheoraenc.c
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@ -106,11 +106,9 @@ static av_cold int encode_init(AVCodecContext* avc_context)
}
t_info.colorspace = OC_CS_UNSPECIFIED;
t_info.pixelformat = OC_PF_420;
t_info.target_bitrate = avc_context->bit_rate;
t_info.keyframe_frequency = avc_context->gop_size;
t_info.keyframe_frequency_force = avc_context->gop_size;
t_info.keyframe_mindistance = avc_context->keyint_min;
t_info.quality = 0;
t_info.quick_p = 1;
t_info.dropframes_p = 0;
@ -120,6 +118,19 @@ static av_cold int encode_init(AVCodecContext* avc_context)
t_info.noise_sensitivity = 1;
t_info.sharpness = 0;
if (avc_context->flags & CODEC_FLAG_QSCALE) {
/* to be constant with the libvorbis implementation, clip global_quality to 0 - 10
Theora accepts a quality parameter p, which is:
* 0 <= p <=63
* an int value
*/
t_info.quality = av_clip(avc_context->global_quality / (float)FF_QP2LAMBDA, 0, 10) * 6.3;
t_info.target_bitrate = 0;
} else {
t_info.target_bitrate = avc_context->bit_rate;
t_info.quality = 0;
}
/* Now initialise libtheora */
if (theora_encode_init( &(h->t_state), &t_info ) != 0) {
av_log(avc_context, AV_LOG_ERROR, "theora_encode_init failed\n");