libavcodec/libx264.c

   1 /*
   2  * H.264 encoding using the x264 library
   3  * Copyright (C) 2005  Mans Rullgard <mans@mansr.com>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avcodec.h"
  23 #include <x264.h>
  24 #include <math.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 typedef struct X264Context {
  30     x264_param_t params;
  31     x264_t *enc;
  32     x264_picture_t pic;
  33     uint8_t *sei;
  34     int sei_size;
  35     AVFrame out_pic;
  36 } X264Context;
  37
  38 static void
  39 X264_log(void *p, int level, const char *fmt, va_list args)
  40 {
  41     static const int level_map[] = {
  42         [X264_LOG_ERROR]   = AV_LOG_ERROR,
  43         [X264_LOG_WARNING] = AV_LOG_WARNING,
  44         [X264_LOG_INFO]    = AV_LOG_INFO,
  45         [X264_LOG_DEBUG]   = AV_LOG_DEBUG
  46     };
  47
  48     if(level < 0 || level > X264_LOG_DEBUG)
  49         return;
  50
  51     av_vlog(p, level_map[level], fmt, args);
  52 }
  53
  54
  55 static int
  56 encode_nals(AVCodecContext *ctx, uint8_t *buf, int size, x264_nal_t *nals, int nnal, int skip_sei)
  57 {
  58     X264Context *x4 = ctx->priv_data;
  59     uint8_t *p = buf;
  60     int i, s;
  61
  62     /* Write the SEI as part of the first frame. */
  63     if(x4->sei_size > 0 && nnal > 0)
  64     {
  65         memcpy(p, x4->sei, x4->sei_size);
  66         p += x4->sei_size;
  67         x4->sei_size = 0;
  68     }
  69
  70     for(i = 0; i < nnal; i++){
  71         /* Don't put the SEI in extradata. */
  72         if(skip_sei && nals[i].i_type == NAL_SEI)
  73         {
  74             x4->sei = av_malloc( 5 + nals[i].i_payload * 4 / 3 );
  75             if(x264_nal_encode(x4->sei, &x4->sei_size, 1, nals + i) < 0)
  76                 return -1;
  77             continue;
  78         }
  79         s = x264_nal_encode(p, &size, 1, nals + i);
  80         if(s < 0)
  81             return -1;
  82         p += s;
  83     }
  84
  85     return p - buf;
  86 }
  87
  88 static int
  89 X264_frame(AVCodecContext *ctx, uint8_t *buf, int bufsize, void *data)
  90 {
  91     X264Context *x4 = ctx->priv_data;
  92     AVFrame *frame = data;
  93     x264_nal_t *nal;
  94     int nnal, i;
  95     x264_picture_t pic_out;
  96
  97     x4->pic.img.i_csp = X264_CSP_I420;
  98     x4->pic.img.i_plane = 3;
  99
 100     if (frame) {
 101         for(i = 0; i < 3; i++){
 102             x4->pic.img.plane[i] = frame->data[i];
 103             x4->pic.img.i_stride[i] = frame->linesize[i];
 104         }
 105
 106         x4->pic.i_pts = frame->pts;
 107         x4->pic.i_type = X264_TYPE_AUTO;
 108     }
 109
 110     if(x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL,
 111                            &pic_out))
 112         return -1;
 113
 114     bufsize = encode_nals(ctx, buf, bufsize, nal, nnal, 0);
 115     if(bufsize < 0)
 116         return -1;
 117
 118     /* FIXME: dts */
 119     x4->out_pic.pts = pic_out.i_pts;
 120
 121     switch(pic_out.i_type){
 122     case X264_TYPE_IDR:
 123     case X264_TYPE_I:
 124         x4->out_pic.pict_type = FF_I_TYPE;
 125         break;
 126     case X264_TYPE_P:
 127         x4->out_pic.pict_type = FF_P_TYPE;
 128         break;
 129     case X264_TYPE_B:
 130     case X264_TYPE_BREF:
 131         x4->out_pic.pict_type = FF_B_TYPE;
 132         break;
 133     }
 134
 135     x4->out_pic.key_frame = pic_out.i_type == X264_TYPE_IDR;
 136     x4->out_pic.quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
 137
 138     return bufsize;
 139 }
 140
 141 static av_cold int
 142 X264_close(AVCodecContext *avctx)
 143 {
 144     X264Context *x4 = avctx->priv_data;
 145
 146     av_freep(&avctx->extradata);
 147     av_free(x4->sei);
 148
 149     if(x4->enc)
 150         x264_encoder_close(x4->enc);
 151
 152     return 0;
 153 }
 154
 155 static av_cold int
 156 X264_init(AVCodecContext *avctx)
 157 {
 158     X264Context *x4 = avctx->priv_data;
 159
 160     x4->sei_size = 0;
 161     x264_param_default(&x4->params);
 162
 163     x4->params.pf_log = X264_log;
 164     x4->params.p_log_private = avctx;
 165
 166     x4->params.i_keyint_max = avctx->gop_size;
 167     x4->params.rc.i_bitrate = avctx->bit_rate / 1000;
 168     x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
 169     x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate / 1000;
 170     x4->params.rc.b_stat_write = avctx->flags & CODEC_FLAG_PASS1;
 171     if(avctx->flags & CODEC_FLAG_PASS2) x4->params.rc.b_stat_read = 1;
 172     else{
 173         if(avctx->crf){
 174             x4->params.rc.i_rc_method = X264_RC_CRF;
 175             x4->params.rc.f_rf_constant = avctx->crf;
 176         }else if(avctx->cqp > -1){
 177             x4->params.rc.i_rc_method = X264_RC_CQP;
 178             x4->params.rc.i_qp_constant = avctx->cqp;
 179         }
 180     }
 181
 182     // if neither crf nor cqp modes are selected we have to enable the RC
 183     // we do it this way because we cannot check if the bitrate has been set
 184     if(!(avctx->crf || (avctx->cqp > -1))) x4->params.rc.i_rc_method = X264_RC_ABR;
 185
 186     x4->params.i_bframe = avctx->max_b_frames;
 187     x4->params.b_cabac = avctx->coder_type == FF_CODER_TYPE_AC;
 188     x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
 189     x4->params.i_bframe_bias = avctx->bframebias;
 190     x4->params.b_bframe_pyramid = avctx->flags2 & CODEC_FLAG2_BPYRAMID;
 191     avctx->has_b_frames= avctx->flags2 & CODEC_FLAG2_BPYRAMID ? 2 : !!avctx->max_b_frames;
 192
 193     x4->params.i_keyint_min = avctx->keyint_min;
 194     if(x4->params.i_keyint_min > x4->params.i_keyint_max)
 195         x4->params.i_keyint_min = x4->params.i_keyint_max;
 196
 197     x4->params.i_scenecut_threshold = avctx->scenechange_threshold;
 198
 199     x4->params.b_deblocking_filter = avctx->flags & CODEC_FLAG_LOOP_FILTER;
 200     x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha;
 201     x4->params.i_deblocking_filter_beta = avctx->deblockbeta;
 202
 203     x4->params.rc.i_qp_min = avctx->qmin;
 204     x4->params.rc.i_qp_max = avctx->qmax;
 205     x4->params.rc.i_qp_step = avctx->max_qdiff;
 206
 207     x4->params.rc.f_qcompress = avctx->qcompress;  /* 0.0 => cbr, 1.0 => constant qp */
 208     x4->params.rc.f_qblur = avctx->qblur;        /* temporally blur quants */
 209     x4->params.rc.f_complexity_blur = avctx->complexityblur;
 210
 211     x4->params.i_frame_reference = avctx->refs;
 212
 213     x4->params.i_width = avctx->width;
 214     x4->params.i_height = avctx->height;
 215     x4->params.vui.i_sar_width = avctx->sample_aspect_ratio.num;
 216     x4->params.vui.i_sar_height = avctx->sample_aspect_ratio.den;
 217     x4->params.i_fps_num = avctx->time_base.den;
 218     x4->params.i_fps_den = avctx->time_base.num;
 219
 220     x4->params.analyse.inter = 0;
 221     if(avctx->partitions){
 222         if(avctx->partitions & X264_PART_I4X4)
 223             x4->params.analyse.inter |= X264_ANALYSE_I4x4;
 224         if(avctx->partitions & X264_PART_I8X8)
 225             x4->params.analyse.inter |= X264_ANALYSE_I8x8;
 226         if(avctx->partitions & X264_PART_P8X8)
 227             x4->params.analyse.inter |= X264_ANALYSE_PSUB16x16;
 228         if(avctx->partitions & X264_PART_P4X4)
 229             x4->params.analyse.inter |= X264_ANALYSE_PSUB8x8;
 230         if(avctx->partitions & X264_PART_B8X8)
 231             x4->params.analyse.inter |= X264_ANALYSE_BSUB16x16;
 232     }
 233
 234     x4->params.analyse.i_direct_mv_pred = avctx->directpred;
 235
 236     x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;
 237
 238     if(avctx->me_method == ME_EPZS)
 239         x4->params.analyse.i_me_method = X264_ME_DIA;
 240     else if(avctx->me_method == ME_HEX)
 241         x4->params.analyse.i_me_method = X264_ME_HEX;
 242     else if(avctx->me_method == ME_UMH)
 243         x4->params.analyse.i_me_method = X264_ME_UMH;
 244     else if(avctx->me_method == ME_FULL)
 245         x4->params.analyse.i_me_method = X264_ME_ESA;
 246     else if(avctx->me_method == ME_TESA)
 247         x4->params.analyse.i_me_method = X264_ME_TESA;
 248     else x4->params.analyse.i_me_method = X264_ME_HEX;
 249
 250     x4->params.analyse.i_me_range = avctx->me_range;
 251     x4->params.analyse.i_subpel_refine = avctx->me_subpel_quality;
 252
 253     x4->params.analyse.b_mixed_references =
 254         avctx->flags2 & CODEC_FLAG2_MIXED_REFS;
 255     x4->params.analyse.b_chroma_me = avctx->me_cmp & FF_CMP_CHROMA;
 256     x4->params.analyse.b_transform_8x8 = avctx->flags2 & CODEC_FLAG2_8X8DCT;
 257     x4->params.analyse.b_fast_pskip = avctx->flags2 & CODEC_FLAG2_FASTPSKIP;
 258
 259     x4->params.analyse.i_trellis = avctx->trellis;
 260     x4->params.analyse.i_noise_reduction = avctx->noise_reduction;
 261
 262     if(avctx->level > 0) x4->params.i_level_idc = avctx->level;
 263
 264     x4->params.rc.f_rate_tolerance =
 265         (float)avctx->bit_rate_tolerance/avctx->bit_rate;
 266
 267     if((avctx->rc_buffer_size != 0) &&
 268             (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)){
 269         x4->params.rc.f_vbv_buffer_init =
 270             (float)avctx->rc_initial_buffer_occupancy/avctx->rc_buffer_size;
 271     }
 272     else x4->params.rc.f_vbv_buffer_init = 0.9;
 273
 274     x4->params.rc.f_ip_factor = 1/fabs(avctx->i_quant_factor);
 275     x4->params.rc.f_pb_factor = avctx->b_quant_factor;
 276     x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
 277
 278     x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
 279     x4->params.i_log_level = X264_LOG_DEBUG;
 280
 281     x4->params.b_aud = avctx->flags2 & CODEC_FLAG2_AUD;
 282
 283     x4->params.i_threads = avctx->thread_count;
 284
 285     x4->params.b_interlaced = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
 286
 287     if(avctx->flags & CODEC_FLAG_GLOBAL_HEADER){
 288         x4->params.b_repeat_headers = 0;
 289     }
 290
 291     x4->enc = x264_encoder_open(&x4->params);
 292     if(!x4->enc)
 293         return -1;
 294
 295     avctx->coded_frame = &x4->out_pic;
 296
 297     if(avctx->flags & CODEC_FLAG_GLOBAL_HEADER){
 298         x264_nal_t *nal;
 299         int nnal, i, s = 0;
 300
 301         x264_encoder_headers(x4->enc, &nal, &nnal);
 302
 303         /* 5 bytes NAL header + worst case escaping */
 304         for(i = 0; i < nnal; i++)
 305             s += 5 + nal[i].i_payload * 4 / 3;
 306
 307         avctx->extradata = av_malloc(s);
 308         avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);
 309     }
 310
 311     return 0;
 312 }
 313
 314 AVCodec libx264_encoder = {
 315     .name = "libx264",
 316     .type = CODEC_TYPE_VIDEO,
 317     .id = CODEC_ID_H264,
 318     .priv_data_size = sizeof(X264Context),
 319     .init = X264_init,
 320     .encode = X264_frame,
 321     .close = X264_close,
 322     .capabilities = CODEC_CAP_DELAY,
 323     .pix_fmts = (enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE },
 324     .long_name = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
 325 };