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libavcodec/libx264.c

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00001 /*
00002  * H.264 encoding using the x264 library
00003  * Copyright (C) 2005  Mans Rullgard <mans@mansr.com>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "avcodec.h"
00023 #include <x264.h>
00024 #include <math.h>
00025 #include <stdio.h>
00026 #include <stdlib.h>
00027 #include <string.h>
00028 
00029 typedef struct X264Context {
00030     x264_param_t    params;
00031     x264_t         *enc;
00032     x264_picture_t  pic;
00033     uint8_t        *sei;
00034     int             sei_size;
00035     AVFrame         out_pic;
00036 } X264Context;
00037 
00038 static void X264_log(void *p, int level, const char *fmt, va_list args)
00039 {
00040     static const int level_map[] = {
00041         [X264_LOG_ERROR]   = AV_LOG_ERROR,
00042         [X264_LOG_WARNING] = AV_LOG_WARNING,
00043         [X264_LOG_INFO]    = AV_LOG_INFO,
00044         [X264_LOG_DEBUG]   = AV_LOG_DEBUG
00045     };
00046 
00047     if (level < 0 || level > X264_LOG_DEBUG)
00048         return;
00049 
00050     av_vlog(p, level_map[level], fmt, args);
00051 }
00052 
00053 #if X264_BUILD >= 76
00054 static int encode_nals(AVCodecContext *ctx, uint8_t *buf, int size,
00055                        x264_nal_t *nals, int nnal, int skip_sei)
00056 {
00057     X264Context *x4 = ctx->priv_data;
00058     uint8_t *p = buf;
00059     int i;
00060 
00061     /* Write the SEI as part of the first frame. */
00062     if (x4->sei_size > 0 && nnal > 0) {
00063         memcpy(p, x4->sei, x4->sei_size);
00064         p += x4->sei_size;
00065         x4->sei_size = 0;
00066     }
00067 
00068     for (i = 0; i < nnal; i++){
00069         /* Don't put the SEI in extradata. */
00070         if (skip_sei && nals[i].i_type == NAL_SEI) {
00071             x4->sei_size = nals[i].i_payload;
00072             x4->sei      = av_malloc(x4->sei_size);
00073             memcpy(x4->sei, nals[i].p_payload, nals[i].i_payload);
00074             continue;
00075         }
00076         memcpy(p, nals[i].p_payload, nals[i].i_payload);
00077         p += nals[i].i_payload;
00078     }
00079 
00080     return p - buf;
00081 }
00082 #else
00083 static int encode_nals(AVCodecContext *ctx, uint8_t *buf, int size, x264_nal_t *nals, int nnal, int skip_sei)
00084 {
00085     X264Context *x4 = ctx->priv_data;
00086     uint8_t *p = buf;
00087     int i, s;
00088 
00089     /* Write the SEI as part of the first frame. */
00090     if (x4->sei_size > 0 && nnal > 0) {
00091         memcpy(p, x4->sei, x4->sei_size);
00092         p += x4->sei_size;
00093         x4->sei_size = 0;
00094     }
00095 
00096     for (i = 0; i < nnal; i++) {
00097         /* Don't put the SEI in extradata. */
00098         if (skip_sei && nals[i].i_type == NAL_SEI) {
00099             x4->sei = av_malloc( 5 + nals[i].i_payload * 4 / 3 );
00100             if(x264_nal_encode(x4->sei, &x4->sei_size, 1, nals + i) < 0)
00101                 return -1;
00102             continue;
00103         }
00104         s = x264_nal_encode(p, &size, 1, nals + i);
00105         if (s < 0)
00106             return -1;
00107         p += s;
00108     }
00109 
00110     return p - buf;
00111 }
00112 #endif
00113 
00114 static int X264_frame(AVCodecContext *ctx, uint8_t *buf,
00115                       int bufsize, void *data)
00116 {
00117     X264Context *x4 = ctx->priv_data;
00118     AVFrame *frame = data;
00119     x264_nal_t *nal;
00120     int nnal, i;
00121     x264_picture_t pic_out;
00122 
00123     x4->pic.img.i_csp   = X264_CSP_I420;
00124     x4->pic.img.i_plane = 3;
00125 
00126     if (frame) {
00127         for (i = 0; i < 3; i++) {
00128             x4->pic.img.plane[i] = frame->data[i];
00129             x4->pic.img.i_stride[i] = frame->linesize[i];
00130         }
00131 
00132         x4->pic.i_pts  = frame->pts;
00133         x4->pic.i_type = X264_TYPE_AUTO;
00134     }
00135 
00136     if (x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL, &pic_out) < 0)
00137         return -1;
00138 
00139     bufsize = encode_nals(ctx, buf, bufsize, nal, nnal, 0);
00140     if (bufsize < 0)
00141         return -1;
00142 
00143     /* FIXME: libx264 now provides DTS, but AVFrame doesn't have a field for it. */
00144     x4->out_pic.pts = pic_out.i_pts;
00145 
00146     switch (pic_out.i_type) {
00147     case X264_TYPE_IDR:
00148     case X264_TYPE_I:
00149         x4->out_pic.pict_type = FF_I_TYPE;
00150         break;
00151     case X264_TYPE_P:
00152         x4->out_pic.pict_type = FF_P_TYPE;
00153         break;
00154     case X264_TYPE_B:
00155     case X264_TYPE_BREF:
00156         x4->out_pic.pict_type = FF_B_TYPE;
00157         break;
00158     }
00159 
00160 #if X264_BUILD < 82
00161     x4->out_pic.key_frame = pic_out.i_type == X264_TYPE_IDR;
00162 #else
00163     x4->out_pic.key_frame = pic_out.b_keyframe;
00164 #endif
00165     x4->out_pic.quality   = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;
00166 
00167     return bufsize;
00168 }
00169 
00170 static av_cold int X264_close(AVCodecContext *avctx)
00171 {
00172     X264Context *x4 = avctx->priv_data;
00173 
00174     av_freep(&avctx->extradata);
00175     av_free(x4->sei);
00176 
00177     if (x4->enc)
00178         x264_encoder_close(x4->enc);
00179 
00180     return 0;
00181 }
00182 
00183 static av_cold int X264_init(AVCodecContext *avctx)
00184 {
00185     X264Context *x4 = avctx->priv_data;
00186 
00187     x4->sei_size = 0;
00188     x264_param_default(&x4->params);
00189 
00190     x4->params.pf_log               = X264_log;
00191     x4->params.p_log_private        = avctx;
00192 
00193     x4->params.i_keyint_max         = avctx->gop_size;
00194     x4->params.rc.i_bitrate         = avctx->bit_rate       / 1000;
00195     x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;
00196     x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate    / 1000;
00197     x4->params.rc.b_stat_write      = avctx->flags & CODEC_FLAG_PASS1;
00198     if (avctx->flags & CODEC_FLAG_PASS2) {
00199         x4->params.rc.b_stat_read = 1;
00200     } else {
00201         if (avctx->crf) {
00202             x4->params.rc.i_rc_method   = X264_RC_CRF;
00203             x4->params.rc.f_rf_constant = avctx->crf;
00204         } else if (avctx->cqp > -1) {
00205             x4->params.rc.i_rc_method   = X264_RC_CQP;
00206             x4->params.rc.i_qp_constant = avctx->cqp;
00207         }
00208     }
00209 
00210     // if neither crf nor cqp modes are selected we have to enable the RC
00211     // we do it this way because we cannot check if the bitrate has been set
00212     if (!(avctx->crf || (avctx->cqp > -1)))
00213         x4->params.rc.i_rc_method = X264_RC_ABR;
00214 
00215     x4->params.i_bframe          = avctx->max_b_frames;
00216     x4->params.b_cabac           = avctx->coder_type == FF_CODER_TYPE_AC;
00217     x4->params.i_bframe_adaptive = avctx->b_frame_strategy;
00218     x4->params.i_bframe_bias     = avctx->bframebias;
00219 #if X264_BUILD >= 78
00220     x4->params.i_bframe_pyramid  = avctx->flags2 & CODEC_FLAG2_BPYRAMID ? X264_B_PYRAMID_NORMAL : X264_B_PYRAMID_NONE;
00221 #else
00222     x4->params.b_bframe_pyramid  = avctx->flags2 & CODEC_FLAG2_BPYRAMID;
00223 #endif
00224     avctx->has_b_frames          = avctx->flags2 & CODEC_FLAG2_BPYRAMID ? 2 : !!avctx->max_b_frames;
00225 
00226     x4->params.i_keyint_min = avctx->keyint_min;
00227     if (x4->params.i_keyint_min > x4->params.i_keyint_max)
00228         x4->params.i_keyint_min = x4->params.i_keyint_max;
00229 
00230     x4->params.i_scenecut_threshold        = avctx->scenechange_threshold;
00231 
00232     x4->params.b_deblocking_filter         = avctx->flags & CODEC_FLAG_LOOP_FILTER;
00233     x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha;
00234     x4->params.i_deblocking_filter_beta    = avctx->deblockbeta;
00235 
00236     x4->params.rc.i_qp_min                 = avctx->qmin;
00237     x4->params.rc.i_qp_max                 = avctx->qmax;
00238     x4->params.rc.i_qp_step                = avctx->max_qdiff;
00239 
00240     x4->params.rc.f_qcompress       = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */
00241     x4->params.rc.f_qblur           = avctx->qblur;     /* temporally blur quants */
00242     x4->params.rc.f_complexity_blur = avctx->complexityblur;
00243 
00244     x4->params.i_frame_reference    = avctx->refs;
00245 
00246     x4->params.i_width              = avctx->width;
00247     x4->params.i_height             = avctx->height;
00248     x4->params.vui.i_sar_width      = avctx->sample_aspect_ratio.num;
00249     x4->params.vui.i_sar_height     = avctx->sample_aspect_ratio.den;
00250 #if X264_BUILD >= 81
00251     x4->params.i_fps_num = x4->params.i_timebase_den = avctx->time_base.den;
00252     x4->params.i_fps_den = x4->params.i_timebase_num = avctx->time_base.num;
00253 #endif
00254 
00255     x4->params.analyse.inter    = 0;
00256     if (avctx->partitions) {
00257         if (avctx->partitions & X264_PART_I4X4)
00258             x4->params.analyse.inter |= X264_ANALYSE_I4x4;
00259         if (avctx->partitions & X264_PART_I8X8)
00260             x4->params.analyse.inter |= X264_ANALYSE_I8x8;
00261         if (avctx->partitions & X264_PART_P8X8)
00262             x4->params.analyse.inter |= X264_ANALYSE_PSUB16x16;
00263         if (avctx->partitions & X264_PART_P4X4)
00264             x4->params.analyse.inter |= X264_ANALYSE_PSUB8x8;
00265         if (avctx->partitions & X264_PART_B8X8)
00266             x4->params.analyse.inter |= X264_ANALYSE_BSUB16x16;
00267     }
00268 
00269     x4->params.analyse.i_direct_mv_pred  = avctx->directpred;
00270 
00271     x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;
00272 #if X264_BUILD >= 79
00273     x4->params.analyse.i_weighted_pred = avctx->weighted_p_pred;
00274 #endif
00275 
00276     if (avctx->me_method == ME_EPZS)
00277         x4->params.analyse.i_me_method = X264_ME_DIA;
00278     else if (avctx->me_method == ME_HEX)
00279         x4->params.analyse.i_me_method = X264_ME_HEX;
00280     else if (avctx->me_method == ME_UMH)
00281         x4->params.analyse.i_me_method = X264_ME_UMH;
00282     else if (avctx->me_method == ME_FULL)
00283         x4->params.analyse.i_me_method = X264_ME_ESA;
00284     else if (avctx->me_method == ME_TESA)
00285         x4->params.analyse.i_me_method = X264_ME_TESA;
00286     else x4->params.analyse.i_me_method = X264_ME_HEX;
00287 
00288     x4->params.analyse.i_me_range         = avctx->me_range;
00289     x4->params.analyse.i_subpel_refine    = avctx->me_subpel_quality;
00290 
00291     x4->params.analyse.b_mixed_references = avctx->flags2 & CODEC_FLAG2_MIXED_REFS;
00292     x4->params.analyse.b_chroma_me        = avctx->me_cmp & FF_CMP_CHROMA;
00293     x4->params.analyse.b_transform_8x8    = avctx->flags2 & CODEC_FLAG2_8X8DCT;
00294     x4->params.analyse.b_fast_pskip       = avctx->flags2 & CODEC_FLAG2_FASTPSKIP;
00295 
00296     x4->params.analyse.i_trellis          = avctx->trellis;
00297     x4->params.analyse.i_noise_reduction  = avctx->noise_reduction;
00298 
00299     if (avctx->level > 0)
00300         x4->params.i_level_idc = avctx->level;
00301 
00302     x4->params.rc.f_rate_tolerance =
00303         (float)avctx->bit_rate_tolerance/avctx->bit_rate;
00304 
00305     if ((avctx->rc_buffer_size != 0) &&
00306         (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
00307         x4->params.rc.f_vbv_buffer_init =
00308             (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;
00309     } else
00310         x4->params.rc.f_vbv_buffer_init = 0.9;
00311 
00312 #if X264_BUILD >= 69
00313     x4->params.rc.b_mb_tree               = !!(avctx->flags2 & CODEC_FLAG2_MBTREE);
00314 #endif
00315     x4->params.rc.f_ip_factor             = 1 / fabs(avctx->i_quant_factor);
00316     x4->params.rc.f_pb_factor             = avctx->b_quant_factor;
00317     x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
00318 
00319     x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
00320     x4->params.i_log_level    = X264_LOG_DEBUG;
00321 
00322     x4->params.b_aud          = avctx->flags2 & CODEC_FLAG2_AUD;
00323 
00324     x4->params.i_threads      = avctx->thread_count;
00325 
00326     x4->params.b_interlaced   = avctx->flags & CODEC_FLAG_INTERLACED_DCT;
00327 
00328     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)
00329         x4->params.b_repeat_headers = 0;
00330 
00331     x4->enc = x264_encoder_open(&x4->params);
00332     if (!x4->enc)
00333         return -1;
00334 
00335     avctx->coded_frame = &x4->out_pic;
00336 
00337 #if X264_BUILD >= 76
00338     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
00339         x264_nal_t *nal;
00340         int nnal, s;
00341 
00342         s = x264_encoder_headers(x4->enc, &nal, &nnal);
00343 
00344         avctx->extradata      = av_malloc(s);
00345         avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);
00346     }
00347 #else
00348     if(avctx->flags & CODEC_FLAG_GLOBAL_HEADER){
00349         x264_nal_t *nal;
00350         int nnal, i, s = 0;
00351 
00352         x264_encoder_headers(x4->enc, &nal, &nnal);
00353 
00354         /* 5 bytes NAL header + worst case escaping */
00355         for (i = 0; i < nnal; i++)
00356              s += 5 + nal[i].i_payload * 4 / 3;
00357 
00358         avctx->extradata = av_malloc(s);
00359         avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);
00360     }
00361 #endif
00362 
00363     return 0;
00364 }
00365 
00366 AVCodec libx264_encoder = {
00367     .name           = "libx264",
00368     .type           = CODEC_TYPE_VIDEO,
00369     .id             = CODEC_ID_H264,
00370     .priv_data_size = sizeof(X264Context),
00371     .init           = X264_init,
00372     .encode         = X264_frame,
00373     .close          = X264_close,
00374     .capabilities   = CODEC_CAP_DELAY,
00375     .pix_fmts       = (const enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE },
00376     .long_name      = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
00377 };

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