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/*
* H.264 encoding using the x264 library
* Copyright (C) 2005 Mans Rullgard <mru@inprovide.com>
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "avcodec.h"
#include <x264.h>
#include <math.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_ERROR,
[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;
}
extern 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;
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, &x4->pic, &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 int
X264_close(AVCodecContext *avctx)
{
X264Context *x4 = avctx->priv_data;
if(x4->enc)
x264_encoder_close(x4->enc);
return 0;
}
extern 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;
if(avctx->rc_buffer_size)
x4->params.rc.b_cbr = 1;
x4->params.i_bframe = avctx->max_b_frames;
x4->params.b_cabac = avctx->coder_type == FF_CODER_TYPE_AC;
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 */
if(avctx->flags & CODEC_FLAG_QSCALE && avctx->global_quality > 0)
x4->params.rc.i_qp_constant =
12 + 6 * log2((double) avctx->global_quality / FF_QP2LAMBDA);
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.i_threads = avctx->thread_count;
x4->enc = x264_encoder_open(&x4->params);
if(!x4->enc)
return -1;
avctx->coded_frame = &x4->out_pic;
return 0;
}
AVCodec x264_encoder = {
.name = "h264",
.type = CODEC_TYPE_VIDEO,
.id = CODEC_ID_H264,
.priv_data_size = sizeof(X264Context),
.init = X264_init,
.encode = X264_frame,
.close = X264_close,
.pix_fmts = (enum PixelFormat[]) { PIX_FMT_YUV420P, -1 }
};
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