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     AVFrame out_pic;
  34 } X264Context;
  35
  36 static void
  37 X264_log(void *p, int level, const char *fmt, va_list args)
  38 {
  39     static const int level_map[] = {
  40         [X264_LOG_ERROR]   = AV_LOG_ERROR,
  41         [X264_LOG_WARNING] = AV_LOG_WARNING,
  42         [X264_LOG_INFO]    = AV_LOG_INFO,
  43         [X264_LOG_DEBUG]   = AV_LOG_DEBUG
  44     };
  45
  46     if(level < 0 || level > X264_LOG_DEBUG)
  47         return;
  48
  49     av_vlog(p, level_map[level], fmt, args);
  50 }
  51
  52
  53 static int
  54 encode_nals(uint8_t *buf, int size, x264_nal_t *nals, int nnal)
  55 {
  56     uint8_t *p = buf;
  57     int i;
  58
  59     for(i = 0; i < nnal; i++){
  60         int s = x264_nal_encode(p, &size, 1, nals + i);
  61         if(s < 0)
  62             return -1;
  63         p += s;
  64     }
  65
  66     return p - buf;
  67 }
  68
  69 static int
  70 X264_frame(AVCodecContext *ctx, uint8_t *buf, int bufsize, void *data)
  71 {
  72     X264Context *x4 = ctx->priv_data;
  73     AVFrame *frame = data;
  74     x264_nal_t *nal;
  75     int nnal, i;
  76     x264_picture_t pic_out;
  77
  78     x4->pic.img.i_csp = X264_CSP_I420;
  79     x4->pic.img.i_plane = 3;
  80
  81     if (frame) {
  82         for(i = 0; i < 3; i++){
  83             x4->pic.img.plane[i] = frame->data[i];
  84             x4->pic.img.i_stride[i] = frame->linesize[i];
  85         }
  86
  87         x4->pic.i_pts = frame->pts;
  88         x4->pic.i_type = X264_TYPE_AUTO;
  89     }
  90
  91     if(x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL,
  92                            &pic_out))
  93         return -1;
  94
  95     bufsize = encode_nals(buf, bufsize, nal, nnal);
  96     if(bufsize < 0)
  97         return -1;
  98
  99     /* FIXME: dts */
 100     x4->out_pic.pts = pic_out.i_pts;
 101
 102     switch(pic_out.i_type){
 103     case X264_TYPE_IDR:
 104     case X264_TYPE_I:
 105         x4->out_pic.pict_type = FF_I_TYPE;
 106         break;
 107     case X264_TYPE_P:
 108         x4->out_pic.pict_type = FF_P_TYPE;
 109         break;
 110     case X264_TYPE_B:
 111     case X264_TYPE_BREF:
 112         x4->out_pic.pict_type = FF_B_TYPE;
 113         break;
 114     }
 115
 116     x4->out_pic.key_frame = pic_out.i_type == X264_TYPE_IDR;
 117     x4->out_pic.quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
 118
 119     return bufsize;
 120 }
 121
 122 static av_cold int
 123 X264_close(AVCodecContext *avctx)
 124 {
 125     X264Context *x4 = avctx->priv_data;
 126
 127     if(x4->enc)
 128         x264_encoder_close(x4->enc);
 129
 130     return 0;
 131 }
 132
 133 static av_cold int
 134 X264_init(AVCodecContext *avctx)
 135 {
 136     X264Context *x4 = avctx->priv_data;
 137
 138     x264_param_default(&x4->params);
 139
 140     x4->params.pf_log = X264_log;
 141     x4->params.p_log_private = avctx;
 142
 143     x4->params.i_keyint_max = avctx->gop_size;
 144     x4->params.rc.i_bitrate = avctx->bit_rate / 1000;
 145     x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
 146     x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate / 1000;
 147     x4->params.rc.b_stat_write = avctx->flags & CODEC_FLAG_PASS1;
 148     if(avctx->flags & CODEC_FLAG_PASS2) x4->params.rc.b_stat_read = 1;
 149     else{
 150         if(avctx->crf){
 151             x4->params.rc.i_rc_method = X264_RC_CRF;
 152             x4->params.rc.f_rf_constant = avctx->crf;
 153         }else if(avctx->cqp > -1){
 154             x4->params.rc.i_rc_method = X264_RC_CQP;
 155             x4->params.rc.i_qp_constant = avctx->cqp;
 156         }
 157     }
 158
 159     // if neither crf nor cqp modes are selected we have to enable the RC
 160     // we do it this way because we cannot check if the bitrate has been set
 161     if(!(avctx->crf || (avctx->cqp > -1))) x4->params.rc.i_rc_method = X264_RC_ABR;
 162
 163     x4->params.i_bframe = avctx->max_b_frames;
 164     x4->params.b_cabac = avctx->coder_type == FF_CODER_TYPE_AC;
 165     x4->params.b_bframe_adaptive = avctx->b_frame_strategy;
 166     x4->params.i_bframe_bias = avctx->bframebias;
 167     x4->params.b_bframe_pyramid = avctx->flags2 & CODEC_FLAG2_BPYRAMID;
 168     avctx->has_b_frames= avctx->flags2 & CODEC_FLAG2_BPYRAMID ? 2 : !!avctx->max_b_frames;
 169
 170     x4->params.i_keyint_min = avctx->keyint_min;
 171     if(x4->params.i_keyint_min > x4->params.i_keyint_max)
 172         x4->params.i_keyint_min = x4->params.i_keyint_max;
 173
 174     x4->params.i_scenecut_threshold = avctx->scenechange_threshold;
 175
 176     x4->params.b_deblocking_filter = avctx->flags & CODEC_FLAG_LOOP_FILTER;
 177     x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha;
 178     x4->params.i_deblocking_filter_beta = avctx->deblockbeta;
 179
 180     x4->params.rc.i_qp_min = avctx->qmin;
 181     x4->params.rc.i_qp_max = avctx->qmax;
 182     x4->params.rc.i_qp_step = avctx->max_qdiff;
 183
 184     x4->params.rc.f_qcompress = avctx->qcompress;  /* 0.0 => cbr, 1.0 => constant qp */
 185     x4->params.rc.f_qblur = avctx->qblur;        /* temporally blur quants */
 186     x4->params.rc.f_complexity_blur = avctx->complexityblur;
 187
 188     x4->params.i_frame_reference = avctx->refs;
 189
 190     x4->params.i_width = avctx->width;
 191     x4->params.i_height = avctx->height;
 192     x4->params.vui.i_sar_width = avctx->sample_aspect_ratio.num;
 193     x4->params.vui.i_sar_height = avctx->sample_aspect_ratio.den;
 194     x4->params.i_fps_num = avctx->time_base.den;
 195     x4->params.i_fps_den = avctx->time_base.num;
 196
 197     x4->params.analyse.inter = 0;
 198     if(avctx->partitions){
 199         if(avctx->partitions & X264_PART_I4X4)
 200             x4->params.analyse.inter |= X264_ANALYSE_I4x4;
 201         if(avctx->partitions & X264_PART_I8X8)
 202             x4->params.analyse.inter |= X264_ANALYSE_I8x8;
 203         if(avctx->partitions & X264_PART_P8X8)
 204             x4->params.analyse.inter |= X264_ANALYSE_PSUB16x16;
 205         if(avctx->partitions & X264_PART_P4X4)
 206             x4->params.analyse.inter |= X264_ANALYSE_PSUB8x8;
 207         if(avctx->partitions & X264_PART_B8X8)
 208             x4->params.analyse.inter |= X264_ANALYSE_BSUB16x16;
 209     }
 210
 211     x4->params.analyse.i_direct_mv_pred = avctx->directpred;
 212
 213     x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;
 214
 215     if(avctx->me_method == ME_EPZS)
 216         x4->params.analyse.i_me_method = X264_ME_DIA;
 217     else if(avctx->me_method == ME_HEX)
 218         x4->params.analyse.i_me_method = X264_ME_HEX;
 219     else if(avctx->me_method == ME_UMH)
 220         x4->params.analyse.i_me_method = X264_ME_UMH;
 221     else if(avctx->me_method == ME_FULL)
 222         x4->params.analyse.i_me_method = X264_ME_ESA;
 223     else if(avctx->me_method == ME_TESA)
 224         x4->params.analyse.i_me_method = X264_ME_TESA;
 225     else x4->params.analyse.i_me_method = X264_ME_HEX;
 226
 227     x4->params.analyse.i_me_range = avctx->me_range;
 228     x4->params.analyse.i_subpel_refine = avctx->me_subpel_quality;
 229
 230     x4->params.analyse.b_bidir_me = avctx->bidir_refine > 0;
 231     x4->params.analyse.b_bframe_rdo = avctx->flags2 & CODEC_FLAG2_BRDO;
 232     x4->params.analyse.b_mixed_references =
 233         avctx->flags2 & CODEC_FLAG2_MIXED_REFS;
 234     x4->params.analyse.b_chroma_me = avctx->me_cmp & FF_CMP_CHROMA;
 235     x4->params.analyse.b_transform_8x8 = avctx->flags2 & CODEC_FLAG2_8X8DCT;
 236     x4->params.analyse.b_fast_pskip = avctx->flags2 & CODEC_FLAG2_FASTPSKIP;
 237
 238     x4->params.analyse.i_trellis = avctx->trellis;
 239     x4->params.analyse.i_noise_reduction = avctx->noise_reduction;
 240
 241     if(avctx->level > 0) x4->params.i_level_idc = avctx->level;
 242
 243     x4->params.rc.f_rate_tolerance =
 244         (float)avctx->bit_rate_tolerance/avctx->bit_rate;
 245
 246     if((avctx->rc_buffer_size != 0) &&
 247             (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)){
 248         x4->params.rc.f_vbv_buffer_init =
 249             (float)avctx->rc_initial_buffer_occupancy/avctx->rc_buffer_size;
 250     }
 251     else x4->params.rc.f_vbv_buffer_init = 0.9;
 252
 253     x4->params.rc.f_ip_factor = 1/fabs(avctx->i_quant_factor);
 254     x4->params.rc.f_pb_factor = avctx->b_quant_factor;
 255     x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
 256     x4->params.rc.psz_rc_eq = avctx->rc_eq;
 257
 258     x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
 259     x4->params.i_log_level = X264_LOG_DEBUG;
 260
 261     x4->params.b_aud = avctx->flags2 & CODEC_FLAG2_AUD;
 262
 263     x4->params.i_threads = avctx->thread_count;
 264
 265     x4->params.b_interlaced = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
 266
 267     if(avctx->flags & CODEC_FLAG_GLOBAL_HEADER){
 268         x4->params.b_repeat_headers = 0;
 269     }
 270
 271     x4->enc = x264_encoder_open(&x4->params);
 272     if(!x4->enc)
 273         return -1;
 274
 275     avctx->coded_frame = &x4->out_pic;
 276
 277     if(avctx->flags & CODEC_FLAG_GLOBAL_HEADER){
 278         x264_nal_t *nal;
 279         int nnal, i, s = 0;
 280
 281         x264_encoder_headers(x4->enc, &nal, &nnal);
 282
 283         /* 5 bytes NAL header + worst case escaping */
 284         for(i = 0; i < nnal; i++)
 285             s += 5 + nal[i].i_payload * 4 / 3;
 286
 287         avctx->extradata = av_malloc(s);
 288         avctx->extradata_size = encode_nals(avctx->extradata, s, nal, nnal);
 289     }
 290
 291     return 0;
 292 }
 293
 294 AVCodec libx264_encoder = {
 295     .name = "libx264",
 296     .type = CODEC_TYPE_VIDEO,
 297     .id = CODEC_ID_H264,
 298     .priv_data_size = sizeof(X264Context),
 299     .init = X264_init,
 300     .encode = X264_frame,
 301     .close = X264_close,
 302     .capabilities = CODEC_CAP_DELAY,
 303     .pix_fmts = (enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE },
 304     .long_name = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
 305 };