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