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ffmpeg/libavcodec/libx264.c

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/*
* H.264 encoding using the x264 library
* Copyright (C) 2005 Mans Rullgard <mans@mansr.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/opt.h"
#include "avcodec.h"
#include <x264.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct X264Context {
AVClass *class;
x264_param_t params;
x264_t *enc;
x264_picture_t pic;
uint8_t *sei;
int sei_size;
AVFrame out_pic;
const char *preset;
const char *tune;
const char *profile;
const char *level;
int fastfirstpass;
const char *stats;
const char *weightp;
} X264Context;
static void X264_log(void *p, int level, const char *fmt, va_list args)
{
static const int level_map[] = {
[X264_LOG_ERROR] = AV_LOG_ERROR,
[X264_LOG_WARNING] = AV_LOG_WARNING,
[X264_LOG_INFO] = AV_LOG_INFO,
[X264_LOG_DEBUG] = AV_LOG_DEBUG
};
if (level < 0 || level > X264_LOG_DEBUG)
return;
av_vlog(p, level_map[level], fmt, args);
}
static int encode_nals(AVCodecContext *ctx, uint8_t *buf, int size,
x264_nal_t *nals, int nnal, int skip_sei)
{
X264Context *x4 = ctx->priv_data;
uint8_t *p = buf;
int i;
/* Write the SEI as part of the first frame. */
if (x4->sei_size > 0 && nnal > 0) {
memcpy(p, x4->sei, x4->sei_size);
p += x4->sei_size;
x4->sei_size = 0;
}
for (i = 0; i < nnal; i++){
/* Don't put the SEI in extradata. */
if (skip_sei && nals[i].i_type == NAL_SEI) {
x4->sei_size = nals[i].i_payload;
x4->sei = av_malloc(x4->sei_size);
memcpy(x4->sei, nals[i].p_payload, nals[i].i_payload);
continue;
}
memcpy(p, nals[i].p_payload, nals[i].i_payload);
p += nals[i].i_payload;
}
return p - buf;
}
static int X264_frame(AVCodecContext *ctx, uint8_t *buf,
int bufsize, void *data)
{
X264Context *x4 = ctx->priv_data;
AVFrame *frame = data;
x264_nal_t *nal;
int nnal, i;
x264_picture_t pic_out;
x264_picture_init( &x4->pic );
x4->pic.img.i_csp = X264_CSP_I420;
x4->pic.img.i_plane = 3;
if (frame) {
for (i = 0; i < 3; i++) {
x4->pic.img.plane[i] = frame->data[i];
x4->pic.img.i_stride[i] = frame->linesize[i];
}
x4->pic.i_pts = frame->pts;
x4->pic.i_type =
frame->pict_type == FF_I_TYPE ? X264_TYPE_KEYFRAME :
frame->pict_type == FF_P_TYPE ? X264_TYPE_P :
frame->pict_type == FF_B_TYPE ? X264_TYPE_B :
X264_TYPE_AUTO;
if (x4->params.b_tff != frame->top_field_first) {
x4->params.b_tff = frame->top_field_first;
x264_encoder_reconfig(x4->enc, &x4->params);
}
}
do {
if (x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL, &pic_out) < 0)
return -1;
bufsize = encode_nals(ctx, buf, bufsize, nal, nnal, 0);
if (bufsize < 0)
return -1;
} while (!bufsize && !frame && x264_encoder_delayed_frames(x4->enc));
/* FIXME: libx264 now provides DTS, but AVFrame doesn't have a field for it. */
x4->out_pic.pts = pic_out.i_pts;
switch (pic_out.i_type) {
case X264_TYPE_IDR:
case X264_TYPE_I:
x4->out_pic.pict_type = FF_I_TYPE;
break;
case X264_TYPE_P:
x4->out_pic.pict_type = FF_P_TYPE;
break;
case X264_TYPE_B:
case X264_TYPE_BREF:
x4->out_pic.pict_type = FF_B_TYPE;
break;
}
x4->out_pic.key_frame = pic_out.b_keyframe;
if (bufsize)
x4->out_pic.quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
return bufsize;
}
static av_cold int X264_close(AVCodecContext *avctx)
{
X264Context *x4 = avctx->priv_data;
av_freep(&avctx->extradata);
av_free(x4->sei);
if (x4->enc)
x264_encoder_close(x4->enc);
return 0;
}
/**
* Detect default settings and use default profile to avoid libx264 failure.
*/
static void check_default_settings(AVCodecContext *avctx)
{
X264Context *x4 = avctx->priv_data;
int score = 0;
score += x4->params.analyse.i_me_range == 0;
score += x4->params.rc.i_qp_step == 3;
score += x4->params.i_keyint_max == 12;
score += x4->params.rc.i_qp_min == 2;
score += x4->params.rc.i_qp_max == 31;
score += x4->params.rc.f_qcompress == 0.5;
score += fabs(x4->params.rc.f_ip_factor - 1.25) < 0.01;
score += fabs(x4->params.rc.f_pb_factor - 1.25) < 0.01;
score += x4->params.analyse.inter == 0 && x4->params.analyse.i_subpel_refine == 8;
if (score >= 5) {
av_log(avctx, AV_LOG_ERROR, "Default settings detected, using medium profile\n");
x4->preset = "medium";
if (avctx->bit_rate == 200*100)
avctx->crf = 23;
}
}
#define OPT_STR(opt, param) \
do { \
if (param && x264_param_parse(&x4->params, opt, param) < 0) { \
av_log(avctx, AV_LOG_ERROR, \
"bad value for '%s': '%s'\n", opt, param); \
return -1; \
} \
} while (0); \
static av_cold int X264_init(AVCodecContext *avctx)
{
X264Context *x4 = avctx->priv_data;
x4->sei_size = 0;
x264_param_default(&x4->params);
x4->params.i_keyint_max = avctx->gop_size;
x4->params.i_bframe = avctx->max_b_frames;
x4->params.b_cabac = avctx->coder_type == FF_CODER_TYPE_AC;
x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
x4->params.i_bframe_bias = avctx->bframebias;
x4->params.i_bframe_pyramid = avctx->flags2 & CODEC_FLAG2_BPYRAMID ? X264_B_PYRAMID_NORMAL : X264_B_PYRAMID_NONE;
avctx->has_b_frames = avctx->flags2 & CODEC_FLAG2_BPYRAMID ? 2 : !!avctx->max_b_frames;
x4->params.i_keyint_min = avctx->keyint_min;
if (x4->params.i_keyint_min > x4->params.i_keyint_max)
x4->params.i_keyint_min = x4->params.i_keyint_max;
x4->params.i_scenecut_threshold = avctx->scenechange_threshold;
x4->params.b_deblocking_filter = avctx->flags & CODEC_FLAG_LOOP_FILTER;
x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha;
x4->params.i_deblocking_filter_beta = avctx->deblockbeta;
x4->params.rc.i_qp_min = avctx->qmin;
x4->params.rc.i_qp_max = avctx->qmax;
x4->params.rc.i_qp_step = avctx->max_qdiff;
x4->params.rc.f_qcompress = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */
x4->params.rc.f_qblur = avctx->qblur; /* temporally blur quants */
x4->params.rc.f_complexity_blur = avctx->complexityblur;
x4->params.i_frame_reference = avctx->refs;
x4->params.analyse.inter = 0;
if (avctx->partitions) {
if (avctx->partitions & X264_PART_I4X4)
x4->params.analyse.inter |= X264_ANALYSE_I4x4;
if (avctx->partitions & X264_PART_I8X8)
x4->params.analyse.inter |= X264_ANALYSE_I8x8;
if (avctx->partitions & X264_PART_P8X8)
x4->params.analyse.inter |= X264_ANALYSE_PSUB16x16;
if (avctx->partitions & X264_PART_P4X4)
x4->params.analyse.inter |= X264_ANALYSE_PSUB8x8;
if (avctx->partitions & X264_PART_B8X8)
x4->params.analyse.inter |= X264_ANALYSE_BSUB16x16;
}
x4->params.analyse.i_direct_mv_pred = avctx->directpred;
x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;
if (avctx->me_method == ME_EPZS)
x4->params.analyse.i_me_method = X264_ME_DIA;
else if (avctx->me_method == ME_HEX)
x4->params.analyse.i_me_method = X264_ME_HEX;
else if (avctx->me_method == ME_UMH)
x4->params.analyse.i_me_method = X264_ME_UMH;
else if (avctx->me_method == ME_FULL)
x4->params.analyse.i_me_method = X264_ME_ESA;
else if (avctx->me_method == ME_TESA)
x4->params.analyse.i_me_method = X264_ME_TESA;
else x4->params.analyse.i_me_method = X264_ME_HEX;
x4->params.rc.i_aq_mode = avctx->aq_mode;
x4->params.rc.f_aq_strength = avctx->aq_strength;
x4->params.rc.i_lookahead = avctx->rc_lookahead;
x4->params.analyse.b_psy = avctx->flags2 & CODEC_FLAG2_PSY;
x4->params.analyse.f_psy_rd = avctx->psy_rd;
x4->params.analyse.f_psy_trellis = avctx->psy_trellis;
x4->params.analyse.i_me_range = avctx->me_range;
x4->params.analyse.i_subpel_refine = avctx->me_subpel_quality;
x4->params.analyse.b_mixed_references = avctx->flags2 & CODEC_FLAG2_MIXED_REFS;
x4->params.analyse.b_chroma_me = avctx->me_cmp & FF_CMP_CHROMA;
x4->params.analyse.b_transform_8x8 = avctx->flags2 & CODEC_FLAG2_8X8DCT;
x4->params.analyse.b_fast_pskip = avctx->flags2 & CODEC_FLAG2_FASTPSKIP;
x4->params.analyse.i_trellis = avctx->trellis;
x4->params.analyse.i_noise_reduction = avctx->noise_reduction;
x4->params.rc.b_mb_tree = !!(avctx->flags2 & CODEC_FLAG2_MBTREE);
x4->params.rc.f_ip_factor = 1 / fabs(avctx->i_quant_factor);
x4->params.rc.f_pb_factor = avctx->b_quant_factor;
x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
if (!x4->preset)
check_default_settings(avctx);
if (x4->preset || x4->tune) {
if (x264_param_default_preset(&x4->params, x4->preset, x4->tune) < 0)
return -1;
}
x4->params.pf_log = X264_log;
x4->params.p_log_private = avctx;
x4->params.i_log_level = X264_LOG_DEBUG;
OPT_STR("weightp", x4->weightp);
x4->params.b_intra_refresh = avctx->flags2 & CODEC_FLAG2_INTRA_REFRESH;
x4->params.rc.i_bitrate = avctx->bit_rate / 1000;
x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate / 1000;
x4->params.rc.b_stat_write = avctx->flags & CODEC_FLAG_PASS1;
if (avctx->flags & CODEC_FLAG_PASS2) {
x4->params.rc.b_stat_read = 1;
} else {
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) {
x4->params.rc.i_rc_method = X264_RC_CQP;
x4->params.rc.i_qp_constant = avctx->cqp;
}
}
OPT_STR("stats", x4->stats);
// if neither crf nor cqp modes are selected we have to enable the RC
// we do it this way because we cannot check if the bitrate has been set
if (!(avctx->crf || (avctx->cqp > -1)))
x4->params.rc.i_rc_method = X264_RC_ABR;
if (avctx->rc_buffer_size && avctx->rc_initial_buffer_occupancy &&
(avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
x4->params.rc.f_vbv_buffer_init =
(float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;
}
OPT_STR("level", x4->level);
if (x4->fastfirstpass)
x264_param_apply_fastfirstpass(&x4->params);
if (x4->profile)
if (x264_param_apply_profile(&x4->params, x4->profile) < 0)
return -1;
x4->params.i_width = avctx->width;
x4->params.i_height = avctx->height;
x4->params.vui.i_sar_width = avctx->sample_aspect_ratio.num;
x4->params.vui.i_sar_height = avctx->sample_aspect_ratio.den;
x4->params.i_fps_num = x4->params.i_timebase_den = avctx->time_base.den;
x4->params.i_fps_den = x4->params.i_timebase_num = avctx->time_base.num;
x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
x4->params.analyse.b_ssim = avctx->flags2 & CODEC_FLAG2_SSIM;
x4->params.b_aud = avctx->flags2 & CODEC_FLAG2_AUD;
x4->params.i_threads = avctx->thread_count;
x4->params.b_interlaced = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
x4->params.i_slice_count = avctx->slices;
x4->params.vui.b_fullrange = avctx->pix_fmt == PIX_FMT_YUVJ420P;
if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)
x4->params.b_repeat_headers = 0;
// update AVCodecContext with x264 parameters
avctx->has_b_frames = x4->params.i_bframe ?
x4->params.i_bframe_pyramid ? 2 : 1 : 0;
avctx->bit_rate = x4->params.rc.i_bitrate*1000;
avctx->crf = x4->params.rc.f_rf_constant;
x4->enc = x264_encoder_open(&x4->params);
if (!x4->enc)
return -1;
avctx->coded_frame = &x4->out_pic;
if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
x264_nal_t *nal;
int nnal, s, i;
s = x264_encoder_headers(x4->enc, &nal, &nnal);
for (i = 0; i < nnal; i++)
if (nal[i].i_type == NAL_SEI)
av_log(avctx, AV_LOG_INFO, "%s\n", nal[i].p_payload+25);
avctx->extradata = av_malloc(s);
avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);
}
return 0;
}
#define OFFSET(x) offsetof(X264Context,x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{"preset", "Set the encoding preset", OFFSET(preset), FF_OPT_TYPE_STRING, 0, 0, 0, VE},
{"tune", "Tune the encoding params", OFFSET(tune), 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},
{"profile", "Set profile restrictions", OFFSET(profile), FF_OPT_TYPE_STRING, 0, 0, 0, VE},
{"level", "Specify level (as defined by Annex A)", OFFSET(level), FF_OPT_TYPE_STRING, 0, 0, 0, VE},
{"passlogfile", "Filename for 2 pass stats", OFFSET(stats), FF_OPT_TYPE_STRING, 0, 0, 0, VE},
{"wpredp", "Weighted prediction for P-frames", OFFSET(weightp), FF_OPT_TYPE_STRING, 0, 0, 0, VE},
{ NULL },
};
static const AVClass class = { "libx264", av_default_item_name, options, LIBAVUTIL_VERSION_INT };
AVCodec ff_libx264_encoder = {
.name = "libx264",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_H264,
.priv_data_size = sizeof(X264Context),
.init = X264_init,
.encode = X264_frame,
.close = X264_close,
.capabilities = CODEC_CAP_DELAY,
.pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_YUVJ420P, PIX_FMT_NONE },
.long_name = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
.priv_class = &class,
};
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