PeerStreamer

/*

 * 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., 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_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;

    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_rf_constant = avctx->crf;

        else if(avctx->cqp > -1) 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.b_cbr = 1;

    x4->params.i_bframe = avctx->max_b_frames;

    x4->params.b_cabac = avctx->coder_type == FF_CODER_TYPE_AC;

    x4->params.b_bframe_adaptive = avctx->b_frame_strategy;

    x4->params.i_bframe_bias = avctx->bframebias;

    x4->params.b_bframe_pyramid = (avctx->flags2 & CODEC_FLAG2_BPYRAMID);

    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 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_bframe_rdo = (avctx->flags2 & CODEC_FLAG2_BRDO);

    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;

    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.rc.psz_rc_eq = avctx->rc_eq;

    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->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 }

};