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libx264: add 'crf' private option.

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Deprecate corresponding global option.

Ideally all x264 private options should be generated automatically, but
x264 doesn't provide the API for this yet.
This commit is contained in:
Anton Khirnov 2011-08-22 07:55:34 +02:00
parent 8ee18b4bee
commit d5dc8cc297
4 changed files with 21 additions and 2 deletions
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5
libavcodec/avcodec.h
View File

@ -2377,12 +2377,15 @@ typedef struct AVCodecContext {
*/
int brd_scale;
#if FF_API_X264_GLOBAL_OPTS
/**
* constant rate factor - quality-based VBR - values ~correspond to qps
* - encoding: Set by user.
* - decoding: unused
* @deprecated use 'crf' libx264 private option
*/
float crf;
attribute_deprecated float crf;
#endif
/**
* constant quantization parameter rate control method

13
libavcodec/libx264.c
View File

@ -23,6 +23,7 @@
#include "avcodec.h"
#include "internal.h"
#include <x264.h>
#include <float.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
@ -40,6 +41,7 @@ typedef struct X264Context {
char *tune;
char *profile;
int fastfirstpass;
float crf;
} X264Context;
static void X264_log(void *p, int level, const char *fmt, va_list args)
@ -274,14 +276,22 @@ static av_cold int X264_init(AVCodecContext *avctx)
if (avctx->flags & CODEC_FLAG_PASS2) {
x4->params.rc.b_stat_read = 1;
} else {
#if FF_API_X264_GLOBAL_OPTS
if (avctx->crf) {
x4->params.rc.i_rc_method = X264_RC_CRF;
x4->params.rc.f_rf_constant = avctx->crf;
x4->params.rc.f_rf_constant_max = avctx->crf_max;
} else if (avctx->cqp > -1) {
} else
#endif
if (avctx->cqp > -1) {
x4->params.rc.i_rc_method = X264_RC_CQP;
x4->params.rc.i_qp_constant = avctx->cqp;
}
if (x4->crf >= 0) {
x4->params.rc.i_rc_method = X264_RC_CRF;
x4->params.rc.f_rf_constant = x4->crf;
}
}
if (avctx->rc_buffer_size && avctx->rc_initial_buffer_occupancy &&
@ -365,6 +375,7 @@ static const AVOption options[] = {
{ "tune", "Tune the encoding params (cf. x264 --fullhelp)", OFFSET(tune), FF_OPT_TYPE_STRING, { 0 }, 0, 0, VE},
{ "profile", "Set profile restrictions (cf. x264 --fullhelp) ", OFFSET(profile), FF_OPT_TYPE_STRING, { 0 }, 0, 0, VE},
{ "fastfirstpass", "Use fast settings when encoding first pass", OFFSET(fastfirstpass), FF_OPT_TYPE_INT, { 1 }, 0, 1, VE},
{ "crf", "Select the quality for constant quality mode", OFFSET(crf), FF_OPT_TYPE_FLOAT, {-1 }, -1, FLT_MAX, VE },
{ NULL },
};

2
libavcodec/options.c
View File

@ -375,7 +375,9 @@ static const AVOption options[]={
{"all" , NULL, 0, FF_OPT_TYPE_CONST, {.dbl = AVDISCARD_ALL }, INT_MIN, INT_MAX, V|D, "avdiscard"},
{"bidir_refine", "refine the two motion vectors used in bidirectional macroblocks", OFFSET(bidir_refine), FF_OPT_TYPE_INT, {.dbl = 1 }, 0, 4, V|E},
{"brd_scale", "downscales frames for dynamic B-frame decision", OFFSET(brd_scale), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, 10, V|E},
#if FF_API_X264_GLOBAL_OPTS
{"crf", "enables constant quality mode, and selects the quality (x264)", OFFSET(crf), FF_OPT_TYPE_FLOAT, {.dbl = DEFAULT }, 0, 51, V|E},
#endif
{"cqp", "constant quantization parameter rate control method", OFFSET(cqp), FF_OPT_TYPE_INT, {.dbl = -1 }, INT_MIN, INT_MAX, V|E},
{"keyint_min", "minimum interval between IDR-frames (x264)", OFFSET(keyint_min), FF_OPT_TYPE_INT, {.dbl = 25 }, INT_MIN, INT_MAX, V|E},
{"refs", "reference frames to consider for motion compensation (Snow)", OFFSET(refs), FF_OPT_TYPE_INT, {.dbl = 1 }, INT_MIN, INT_MAX, V|E},

3
libavcodec/version.h
View File

@ -83,5 +83,8 @@
#ifndef FF_API_AVCODEC_INIT
#define FF_API_AVCODEC_INIT (LIBAVCODEC_VERSION_MAJOR < 54)
#endif
#ifndef FF_API_X264_GLOBAL_OPTS
#define FF_API_X264_GLOBAL_OPTS (LIBAVCODEC_VERSION_MAJOR < 54)
#endif
#endif /* AVCODEC_VERSION_H */