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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 "avcodec.h"
#include <x264.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct X264Context {
x264_param_t params;
x264_t *enc;
x264_picture_t pic;
AVFrame out_pic;
} 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(uint8_t *buf, int size, x264_nal_t *nals, int nnal)
{
uint8_t *p = buf;
int i;
for(i = 0; i < nnal; i++){
int s = x264_nal_encode(p, &size, 1, nals + i);
if(s < 0)
return -1;
p += s;
}
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;
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 = X264_TYPE_AUTO;
}
if(x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL,
&pic_out))
return -1;
bufsize = encode_nals(buf, bufsize, nal, nnal);
if(bufsize < 0)
return -1;
/* FIXME: dts */
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.i_type == X264_TYPE_IDR;
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);
if(x4->enc)
x264_encoder_close(x4->enc);
return 0;
}
static av_cold int
X264_init(AVCodecContext *avctx)
{
X264Context *x4 = avctx->priv_data;
x264_param_default(&x4->params);
x4->params.pf_log = X264_log;
x4->params.p_log_private = avctx;
x4->params.i_keyint_max = avctx->gop_size;
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;
}else if(avctx->cqp > -1){
x4->params.rc.i_rc_method = X264_RC_CQP;
x4->params.rc.i_qp_constant = avctx->cqp;
}
}
// 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;
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.b_bframe_pyramid = avctx->flags2 & CODEC_FLAG2_BPYRAMID;
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.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 = avctx->time_base.den;
x4->params.i_fps_den = avctx->time_base.num;
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.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;
if(avctx->level > 0) x4->params.i_level_idc = avctx->level;
x4->params.rc.f_rate_tolerance =
(float)avctx->bit_rate_tolerance/avctx->bit_rate;
if((avctx->rc_buffer_size != 0) &&
(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;
}
else x4->params.rc.f_vbv_buffer_init = 0.9;
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;
x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
x4->params.i_log_level = X264_LOG_DEBUG;
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;
if(avctx->flags & CODEC_FLAG_GLOBAL_HEADER){
x4->params.b_repeat_headers = 0;
}
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, i, s = 0;
x264_encoder_headers(x4->enc, &nal, &nnal);
/* 5 bytes NAL header + worst case escaping */
for(i = 0; i < nnal; i++)
s += 5 + nal[i].i_payload * 4 / 3;
avctx->extradata = av_malloc(s);
avctx->extradata_size = encode_nals(avctx->extradata, s, nal, nnal);
}
return 0;
}
AVCodec libx264_encoder = {
.name = "libx264",
.type = CODEC_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 = (enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE },
.long_name = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
};
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