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ffmpeg / libavcodec / libx264.c @ 2d3beede

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/*
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 * H.264 encoding using the x264 library
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 * Copyright (C) 2005  Mans Rullgard <mans@mansr.com>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "avcodec.h"
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#include <x264.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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typedef struct X264Context {
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    x264_param_t params;
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    x264_t *enc;
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    x264_picture_t pic;
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    uint8_t *sei;
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    int sei_size;
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    AVFrame out_pic;
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} X264Context;
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static void
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X264_log(void *p, int level, const char *fmt, va_list args)
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{
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    static const int level_map[] = {
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        [X264_LOG_ERROR]   = AV_LOG_ERROR,
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        [X264_LOG_WARNING] = AV_LOG_WARNING,
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        [X264_LOG_INFO]    = AV_LOG_INFO,
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        [X264_LOG_DEBUG]   = AV_LOG_DEBUG
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    };
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    if(level < 0 || level > X264_LOG_DEBUG)
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        return;
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    av_vlog(p, level_map[level], fmt, args);
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}
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static int encode_nals(AVCodecContext *ctx, uint8_t *buf, int size, x264_nal_t *nals, int nnal, int skip_sei)
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{
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    X264Context *x4 = ctx->priv_data;
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    uint8_t *p = buf;
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    int i;
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    /* Write the SEI as part of the first frame. */
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    if(x4->sei_size > 0 && nnal > 0){
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        memcpy(p, x4->sei, x4->sei_size);
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        p += x4->sei_size;
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        x4->sei_size = 0;
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    }
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    for(i = 0; i < nnal; i++){
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        /* Don't put the SEI in extradata. */
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        if(skip_sei && nals[i].i_type == NAL_SEI){
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            x4->sei_size = nals[i].i_payload;
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            x4->sei = av_malloc(x4->sei_size);
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            memcpy(x4->sei, nals[i].p_payload, nals[i].i_payload);
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            continue;
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        }
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        memcpy(p, nals[i].p_payload, nals[i].i_payload);
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        p += nals[i].i_payload;
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    }
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    return p - buf;
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}
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static int
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X264_frame(AVCodecContext *ctx, uint8_t *buf, int bufsize, void *data)
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{
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    X264Context *x4 = ctx->priv_data;
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    AVFrame *frame = data;
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    x264_nal_t *nal;
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    int nnal, i;
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    x264_picture_t pic_out;
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    x4->pic.img.i_csp = X264_CSP_I420;
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    x4->pic.img.i_plane = 3;
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    if(frame){
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        for(i = 0; i < 3; i++){
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            x4->pic.img.plane[i] = frame->data[i];
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            x4->pic.img.i_stride[i] = frame->linesize[i];
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        }
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        x4->pic.i_pts = frame->pts;
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        x4->pic.i_type = X264_TYPE_AUTO;
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    }
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    if(x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL, &pic_out) < 0)
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        return -1;
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    bufsize = encode_nals(ctx, buf, bufsize, nal, nnal, 0);
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    if(bufsize < 0)
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        return -1;
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    /* FIXME: dts */
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    x4->out_pic.pts = pic_out.i_pts;
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    switch(pic_out.i_type){
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    case X264_TYPE_IDR:
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    case X264_TYPE_I:
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        x4->out_pic.pict_type = FF_I_TYPE;
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        break;
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    case X264_TYPE_P:
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        x4->out_pic.pict_type = FF_P_TYPE;
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        break;
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    case X264_TYPE_B:
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    case X264_TYPE_BREF:
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        x4->out_pic.pict_type = FF_B_TYPE;
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        break;
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    }
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    x4->out_pic.key_frame = pic_out.i_type == X264_TYPE_IDR;
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    x4->out_pic.quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
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    return bufsize;
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}
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static av_cold int
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X264_close(AVCodecContext *avctx)
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{
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    X264Context *x4 = avctx->priv_data;
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    av_freep(&avctx->extradata);
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    av_free(x4->sei);
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    if(x4->enc)
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        x264_encoder_close(x4->enc);
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    return 0;
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}
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static av_cold int
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X264_init(AVCodecContext *avctx)
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{
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    X264Context *x4 = avctx->priv_data;
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    x4->sei_size = 0;
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    x264_param_default(&x4->params);
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    x4->params.pf_log = X264_log;
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    x4->params.p_log_private = avctx;
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    x4->params.i_keyint_max = avctx->gop_size;
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    x4->params.rc.i_bitrate = avctx->bit_rate / 1000;
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    x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
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    x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate / 1000;
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    x4->params.rc.b_stat_write = avctx->flags & CODEC_FLAG_PASS1;
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    if(avctx->flags & CODEC_FLAG_PASS2) x4->params.rc.b_stat_read = 1;
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    else{
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        if(avctx->crf){
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            x4->params.rc.i_rc_method = X264_RC_CRF;
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            x4->params.rc.f_rf_constant = avctx->crf;
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        }else if(avctx->cqp > -1){
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            x4->params.rc.i_rc_method = X264_RC_CQP;
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            x4->params.rc.i_qp_constant = avctx->cqp;
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        }
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    }
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    // if neither crf nor cqp modes are selected we have to enable the RC
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    // we do it this way because we cannot check if the bitrate has been set
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    if(!(avctx->crf || (avctx->cqp > -1))) x4->params.rc.i_rc_method = X264_RC_ABR;
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    x4->params.i_bframe = avctx->max_b_frames;
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    x4->params.b_cabac = avctx->coder_type == FF_CODER_TYPE_AC;
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    x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
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    x4->params.i_bframe_bias = avctx->bframebias;
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    x4->params.b_bframe_pyramid = avctx->flags2 & CODEC_FLAG2_BPYRAMID;
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    avctx->has_b_frames= avctx->flags2 & CODEC_FLAG2_BPYRAMID ? 2 : !!avctx->max_b_frames;
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    x4->params.i_keyint_min = avctx->keyint_min;
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    if(x4->params.i_keyint_min > x4->params.i_keyint_max)
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        x4->params.i_keyint_min = x4->params.i_keyint_max;
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    x4->params.i_scenecut_threshold = avctx->scenechange_threshold;
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    x4->params.b_deblocking_filter = avctx->flags & CODEC_FLAG_LOOP_FILTER;
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    x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha;
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    x4->params.i_deblocking_filter_beta = avctx->deblockbeta;
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    x4->params.rc.i_qp_min = avctx->qmin;
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    x4->params.rc.i_qp_max = avctx->qmax;
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    x4->params.rc.i_qp_step = avctx->max_qdiff;
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    x4->params.rc.f_qcompress = avctx->qcompress;  /* 0.0 => cbr, 1.0 => constant qp */
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    x4->params.rc.f_qblur = avctx->qblur;        /* temporally blur quants */
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    x4->params.rc.f_complexity_blur = avctx->complexityblur;
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    x4->params.i_frame_reference = avctx->refs;
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    x4->params.i_width = avctx->width;
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    x4->params.i_height = avctx->height;
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    x4->params.vui.i_sar_width = avctx->sample_aspect_ratio.num;
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    x4->params.vui.i_sar_height = avctx->sample_aspect_ratio.den;
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    x4->params.i_fps_num = avctx->time_base.den;
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    x4->params.i_fps_den = avctx->time_base.num;
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    x4->params.analyse.inter = 0;
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    if(avctx->partitions){
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        if(avctx->partitions & X264_PART_I4X4)
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            x4->params.analyse.inter |= X264_ANALYSE_I4x4;
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        if(avctx->partitions & X264_PART_I8X8)
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            x4->params.analyse.inter |= X264_ANALYSE_I8x8;
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        if(avctx->partitions & X264_PART_P8X8)
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            x4->params.analyse.inter |= X264_ANALYSE_PSUB16x16;
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        if(avctx->partitions & X264_PART_P4X4)
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            x4->params.analyse.inter |= X264_ANALYSE_PSUB8x8;
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        if(avctx->partitions & X264_PART_B8X8)
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            x4->params.analyse.inter |= X264_ANALYSE_BSUB16x16;
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    }
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    x4->params.analyse.i_direct_mv_pred = avctx->directpred;
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    x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;
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    if(avctx->me_method == ME_EPZS)
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        x4->params.analyse.i_me_method = X264_ME_DIA;
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    else if(avctx->me_method == ME_HEX)
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        x4->params.analyse.i_me_method = X264_ME_HEX;
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    else if(avctx->me_method == ME_UMH)
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        x4->params.analyse.i_me_method = X264_ME_UMH;
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    else if(avctx->me_method == ME_FULL)
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        x4->params.analyse.i_me_method = X264_ME_ESA;
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    else if(avctx->me_method == ME_TESA)
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        x4->params.analyse.i_me_method = X264_ME_TESA;
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    else x4->params.analyse.i_me_method = X264_ME_HEX;
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    x4->params.analyse.i_me_range = avctx->me_range;
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    x4->params.analyse.i_subpel_refine = avctx->me_subpel_quality;
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    x4->params.analyse.b_mixed_references =
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        avctx->flags2 & CODEC_FLAG2_MIXED_REFS;
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    x4->params.analyse.b_chroma_me = avctx->me_cmp & FF_CMP_CHROMA;
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    x4->params.analyse.b_transform_8x8 = avctx->flags2 & CODEC_FLAG2_8X8DCT;
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    x4->params.analyse.b_fast_pskip = avctx->flags2 & CODEC_FLAG2_FASTPSKIP;
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    x4->params.analyse.i_trellis = avctx->trellis;
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    x4->params.analyse.i_noise_reduction = avctx->noise_reduction;
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    if(avctx->level > 0) x4->params.i_level_idc = avctx->level;
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    x4->params.rc.f_rate_tolerance =
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        (float)avctx->bit_rate_tolerance/avctx->bit_rate;
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    if((avctx->rc_buffer_size != 0) &&
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            (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)){
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        x4->params.rc.f_vbv_buffer_init =
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            (float)avctx->rc_initial_buffer_occupancy/avctx->rc_buffer_size;
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    }
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    else x4->params.rc.f_vbv_buffer_init = 0.9;
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    x4->params.rc.f_ip_factor = 1/fabs(avctx->i_quant_factor);
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    x4->params.rc.f_pb_factor = avctx->b_quant_factor;
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    x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
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    x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
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    x4->params.i_log_level = X264_LOG_DEBUG;
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    x4->params.b_aud = avctx->flags2 & CODEC_FLAG2_AUD;
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    x4->params.i_threads = avctx->thread_count;
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    x4->params.b_interlaced = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
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    if(avctx->flags & CODEC_FLAG_GLOBAL_HEADER){
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        x4->params.b_repeat_headers = 0;
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    }
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    x4->enc = x264_encoder_open(&x4->params);
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    if(!x4->enc)
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        return -1;
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    avctx->coded_frame = &x4->out_pic;
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    if(avctx->flags & CODEC_FLAG_GLOBAL_HEADER){
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        x264_nal_t *nal;
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        int nnal, s;
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        s = x264_encoder_headers(x4->enc, &nal, &nnal);
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        avctx->extradata = av_malloc(s);
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        avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);
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    }
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    return 0;
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}
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AVCodec libx264_encoder = {
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    .name = "libx264",
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    .type = CODEC_TYPE_VIDEO,
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    .id = CODEC_ID_H264,
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    .priv_data_size = sizeof(X264Context),
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    .init = X264_init,
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    .encode = X264_frame,
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    .close = X264_close,
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    .capabilities = CODEC_CAP_DELAY,
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    .pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE },
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    .long_name = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
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};