Libav
|
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 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 00083 static int X264_frame(AVCodecContext *ctx, uint8_t *buf, 00084 int bufsize, void *data) 00085 { 00086 X264Context *x4 = ctx->priv_data; 00087 AVFrame *frame = data; 00088 x264_nal_t *nal; 00089 int nnal, i; 00090 x264_picture_t pic_out; 00091 00092 x4->pic.img.i_csp = X264_CSP_I420; 00093 x4->pic.img.i_plane = 3; 00094 00095 if (frame) { 00096 for (i = 0; i < 3; i++) { 00097 x4->pic.img.plane[i] = frame->data[i]; 00098 x4->pic.img.i_stride[i] = frame->linesize[i]; 00099 } 00100 00101 x4->pic.i_pts = frame->pts; 00102 x4->pic.i_type = X264_TYPE_AUTO; 00103 } 00104 00105 if (x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL, &pic_out) < 0) 00106 return -1; 00107 00108 bufsize = encode_nals(ctx, buf, bufsize, nal, nnal, 0); 00109 if (bufsize < 0) 00110 return -1; 00111 00112 /* FIXME: libx264 now provides DTS, but AVFrame doesn't have a field for it. */ 00113 x4->out_pic.pts = pic_out.i_pts; 00114 00115 switch (pic_out.i_type) { 00116 case X264_TYPE_IDR: 00117 case X264_TYPE_I: 00118 x4->out_pic.pict_type = FF_I_TYPE; 00119 break; 00120 case X264_TYPE_P: 00121 x4->out_pic.pict_type = FF_P_TYPE; 00122 break; 00123 case X264_TYPE_B: 00124 case X264_TYPE_BREF: 00125 x4->out_pic.pict_type = FF_B_TYPE; 00126 break; 00127 } 00128 00129 x4->out_pic.key_frame = pic_out.b_keyframe; 00130 x4->out_pic.quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA; 00131 00132 return bufsize; 00133 } 00134 00135 static av_cold int X264_close(AVCodecContext *avctx) 00136 { 00137 X264Context *x4 = avctx->priv_data; 00138 00139 av_freep(&avctx->extradata); 00140 av_free(x4->sei); 00141 00142 if (x4->enc) 00143 x264_encoder_close(x4->enc); 00144 00145 return 0; 00146 } 00147 00148 static av_cold int X264_init(AVCodecContext *avctx) 00149 { 00150 X264Context *x4 = avctx->priv_data; 00151 00152 x4->sei_size = 0; 00153 x264_param_default(&x4->params); 00154 00155 x4->params.pf_log = X264_log; 00156 x4->params.p_log_private = avctx; 00157 00158 x4->params.i_keyint_max = avctx->gop_size; 00159 x4->params.rc.i_bitrate = avctx->bit_rate / 1000; 00160 x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000; 00161 x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate / 1000; 00162 x4->params.rc.b_stat_write = avctx->flags & CODEC_FLAG_PASS1; 00163 if (avctx->flags & CODEC_FLAG_PASS2) { 00164 x4->params.rc.b_stat_read = 1; 00165 } else { 00166 if (avctx->crf) { 00167 x4->params.rc.i_rc_method = X264_RC_CRF; 00168 x4->params.rc.f_rf_constant = avctx->crf; 00169 } else if (avctx->cqp > -1) { 00170 x4->params.rc.i_rc_method = X264_RC_CQP; 00171 x4->params.rc.i_qp_constant = avctx->cqp; 00172 } 00173 } 00174 00175 // if neither crf nor cqp modes are selected we have to enable the RC 00176 // we do it this way because we cannot check if the bitrate has been set 00177 if (!(avctx->crf || (avctx->cqp > -1))) 00178 x4->params.rc.i_rc_method = X264_RC_ABR; 00179 00180 x4->params.i_bframe = avctx->max_b_frames; 00181 x4->params.b_cabac = avctx->coder_type == FF_CODER_TYPE_AC; 00182 x4->params.i_bframe_adaptive = avctx->b_frame_strategy; 00183 x4->params.i_bframe_bias = avctx->bframebias; 00184 x4->params.i_bframe_pyramid = avctx->flags2 & CODEC_FLAG2_BPYRAMID ? X264_B_PYRAMID_NORMAL : X264_B_PYRAMID_NONE; 00185 avctx->has_b_frames = avctx->flags2 & CODEC_FLAG2_BPYRAMID ? 2 : !!avctx->max_b_frames; 00186 00187 x4->params.i_keyint_min = avctx->keyint_min; 00188 if (x4->params.i_keyint_min > x4->params.i_keyint_max) 00189 x4->params.i_keyint_min = x4->params.i_keyint_max; 00190 00191 x4->params.i_scenecut_threshold = avctx->scenechange_threshold; 00192 00193 x4->params.b_deblocking_filter = avctx->flags & CODEC_FLAG_LOOP_FILTER; 00194 x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha; 00195 x4->params.i_deblocking_filter_beta = avctx->deblockbeta; 00196 00197 x4->params.rc.i_qp_min = avctx->qmin; 00198 x4->params.rc.i_qp_max = avctx->qmax; 00199 x4->params.rc.i_qp_step = avctx->max_qdiff; 00200 00201 x4->params.rc.f_qcompress = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */ 00202 x4->params.rc.f_qblur = avctx->qblur; /* temporally blur quants */ 00203 x4->params.rc.f_complexity_blur = avctx->complexityblur; 00204 00205 x4->params.i_frame_reference = avctx->refs; 00206 00207 x4->params.i_width = avctx->width; 00208 x4->params.i_height = avctx->height; 00209 x4->params.vui.i_sar_width = avctx->sample_aspect_ratio.num; 00210 x4->params.vui.i_sar_height = avctx->sample_aspect_ratio.den; 00211 x4->params.i_fps_num = x4->params.i_timebase_den = avctx->time_base.den; 00212 x4->params.i_fps_den = x4->params.i_timebase_num = avctx->time_base.num; 00213 00214 x4->params.analyse.inter = 0; 00215 if (avctx->partitions) { 00216 if (avctx->partitions & X264_PART_I4X4) 00217 x4->params.analyse.inter |= X264_ANALYSE_I4x4; 00218 if (avctx->partitions & X264_PART_I8X8) 00219 x4->params.analyse.inter |= X264_ANALYSE_I8x8; 00220 if (avctx->partitions & X264_PART_P8X8) 00221 x4->params.analyse.inter |= X264_ANALYSE_PSUB16x16; 00222 if (avctx->partitions & X264_PART_P4X4) 00223 x4->params.analyse.inter |= X264_ANALYSE_PSUB8x8; 00224 if (avctx->partitions & X264_PART_B8X8) 00225 x4->params.analyse.inter |= X264_ANALYSE_BSUB16x16; 00226 } 00227 00228 x4->params.analyse.i_direct_mv_pred = avctx->directpred; 00229 00230 x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED; 00231 x4->params.analyse.i_weighted_pred = avctx->weighted_p_pred; 00232 00233 if (avctx->me_method == ME_EPZS) 00234 x4->params.analyse.i_me_method = X264_ME_DIA; 00235 else if (avctx->me_method == ME_HEX) 00236 x4->params.analyse.i_me_method = X264_ME_HEX; 00237 else if (avctx->me_method == ME_UMH) 00238 x4->params.analyse.i_me_method = X264_ME_UMH; 00239 else if (avctx->me_method == ME_FULL) 00240 x4->params.analyse.i_me_method = X264_ME_ESA; 00241 else if (avctx->me_method == ME_TESA) 00242 x4->params.analyse.i_me_method = X264_ME_TESA; 00243 else x4->params.analyse.i_me_method = X264_ME_HEX; 00244 00245 x4->params.rc.i_aq_mode = avctx->aq_mode; 00246 x4->params.rc.f_aq_strength = avctx->aq_strength; 00247 x4->params.rc.i_lookahead = avctx->rc_lookahead; 00248 00249 x4->params.analyse.b_psy = avctx->flags2 & CODEC_FLAG2_PSY; 00250 x4->params.analyse.f_psy_rd = avctx->psy_rd; 00251 x4->params.analyse.f_psy_trellis = avctx->psy_trellis; 00252 00253 x4->params.analyse.i_me_range = avctx->me_range; 00254 x4->params.analyse.i_subpel_refine = avctx->me_subpel_quality; 00255 00256 x4->params.analyse.b_mixed_references = avctx->flags2 & CODEC_FLAG2_MIXED_REFS; 00257 x4->params.analyse.b_chroma_me = avctx->me_cmp & FF_CMP_CHROMA; 00258 x4->params.analyse.b_transform_8x8 = avctx->flags2 & CODEC_FLAG2_8X8DCT; 00259 x4->params.analyse.b_fast_pskip = avctx->flags2 & CODEC_FLAG2_FASTPSKIP; 00260 00261 x4->params.analyse.i_trellis = avctx->trellis; 00262 x4->params.analyse.i_noise_reduction = avctx->noise_reduction; 00263 00264 if (avctx->level > 0) 00265 x4->params.i_level_idc = avctx->level; 00266 00267 x4->params.rc.f_rate_tolerance = 00268 (float)avctx->bit_rate_tolerance/avctx->bit_rate; 00269 00270 if ((avctx->rc_buffer_size != 0) && 00271 (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) { 00272 x4->params.rc.f_vbv_buffer_init = 00273 (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size; 00274 } else 00275 x4->params.rc.f_vbv_buffer_init = 0.9; 00276 00277 x4->params.rc.b_mb_tree = !!(avctx->flags2 & CODEC_FLAG2_MBTREE); 00278 x4->params.rc.f_ip_factor = 1 / fabs(avctx->i_quant_factor); 00279 x4->params.rc.f_pb_factor = avctx->b_quant_factor; 00280 x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset; 00281 00282 x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR; 00283 x4->params.analyse.b_ssim = avctx->flags2 & CODEC_FLAG2_SSIM; 00284 x4->params.i_log_level = X264_LOG_DEBUG; 00285 00286 x4->params.b_aud = avctx->flags2 & CODEC_FLAG2_AUD; 00287 00288 x4->params.i_threads = avctx->thread_count; 00289 00290 x4->params.b_interlaced = avctx->flags & CODEC_FLAG_INTERLACED_DCT; 00291 00292 if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) 00293 x4->params.b_repeat_headers = 0; 00294 00295 x4->enc = x264_encoder_open(&x4->params); 00296 if (!x4->enc) 00297 return -1; 00298 00299 avctx->coded_frame = &x4->out_pic; 00300 00301 if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) { 00302 x264_nal_t *nal; 00303 int nnal, s, i; 00304 00305 s = x264_encoder_headers(x4->enc, &nal, &nnal); 00306 00307 for (i = 0; i < nnal; i++) 00308 if (nal[i].i_type == NAL_SEI) 00309 av_log(avctx, AV_LOG_INFO, "%s\n", nal[i].p_payload+25); 00310 00311 avctx->extradata = av_malloc(s); 00312 avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1); 00313 } 00314 00315 return 0; 00316 } 00317 00318 AVCodec libx264_encoder = { 00319 .name = "libx264", 00320 .type = AVMEDIA_TYPE_VIDEO, 00321 .id = CODEC_ID_H264, 00322 .priv_data_size = sizeof(X264Context), 00323 .init = X264_init, 00324 .encode = X264_frame, 00325 .close = X264_close, 00326 .capabilities = CODEC_CAP_DELAY, 00327 .pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE }, 00328 .long_name = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"), 00329 };