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Code Issues Releases Activity

Implement the fields rc_max_available_vbv_use and

Browse Source 
rc_min_vbv_overflow_use in AVCodecContext, and use their values in the
ratecontrol code rather than hardcoded ones.

See the thread: "[RFC] ratecontrol buffer size magic".
Patch by Baptiste Coudurier.

Originally committed as revision 15955 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2008-11-29 14:08:48 +00:00 committed by Stefano Sabatini
parent cd0e37d3b1
commit 3bff4d8b7a
4 changed files with 20 additions and 4 deletions
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16
libavcodec/avcodec.h
View File

@ -30,7 +30,7 @@
#include "libavutil/avutil.h"
#define LIBAVCODEC_VERSION_MAJOR 52
#define LIBAVCODEC_VERSION_MINOR 3
#define LIBAVCODEC_VERSION_MINOR 4
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
@ -2283,6 +2283,20 @@ typedef struct AVCodecContext {
* - decoding: Set by user.
*/
int64_t request_channel_layout;
/**
* Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
* - encoding: Set by user.
* - decoding: unused.
*/
float rc_max_available_vbv_use;
/**
* Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
* - encoding: Set by user.
* - decoding: unused.
*/
float rc_min_vbv_overflow_use;
} AVCodecContext;
/**

2
libavcodec/mpegvideo_enc.c
View File

@ -1231,7 +1231,7 @@ vbv_retry:
if(avctx->rc_buffer_size){
RateControlContext *rcc= &s->rc_context;
int max_size= rcc->buffer_index/3;
int max_size= rcc->buffer_index * avctx->rc_max_available_vbv_use;
if(put_bits_count(&s->pb) > max_size && s->lambda < s->avctx->lmax){
s->next_lambda= FFMAX(s->lambda+1, s->lambda*(s->qscale+1) / s->qscale);

4
libavcodec/ratecontrol.c
View File

@ -461,7 +461,7 @@ static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q,
else if(d<0.0001) d=0.0001;
q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1));
q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index) * s->avctx->rc_min_vbv_overflow_use, 1));
if(q > q_limit){
if(s->avctx->debug&FF_DEBUG_RC){
av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
@ -476,7 +476,7 @@ static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q,
else if(d<0.0001) d=0.0001;
q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
q_limit= bits2qp(rce, FFMAX(rcc->buffer_index/3, 1));
q_limit= bits2qp(rce, FFMAX(rcc->buffer_index * s->avctx->rc_max_available_vbv_use, 1));
if(q < q_limit){
if(s->avctx->debug&FF_DEBUG_RC){
av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);

2
libavcodec/utils.c
View File

@ -743,6 +743,8 @@ static const AVOption options[]={
{"bits_per_raw_sample", NULL, OFFSET(bits_per_raw_sample), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX},
{"channel_layout", NULL, OFFSET(channel_layout), FF_OPT_TYPE_INT64, DEFAULT, 0, INT64_MAX, A|E|D, "channel_layout"},
{"request_channel_layout", NULL, OFFSET(request_channel_layout), FF_OPT_TYPE_INT64, DEFAULT, 0, INT64_MAX, A|D, "request_channel_layout"},
{"rc_max_vbv_use", NULL, OFFSET(rc_max_available_vbv_use), FF_OPT_TYPE_FLOAT, 1.0/3, 0.0, FLT_MAX, V|E},
{"rc_min_vbv_use", NULL, OFFSET(rc_min_vbv_overflow_use), FF_OPT_TYPE_FLOAT, 3, 0.0, FLT_MAX, V|E},
{NULL},
};