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FFmpeg/libavcodec/libx264.c

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  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 "libavutil/opt.h"

  23. #include "avcodec.h"

  24. #include "internal.h"

  25. #include <x264.h>

  26. #include <math.h>

  27. #include <stdio.h>

  28. #include <stdlib.h>

  29. #include <string.h>

  30. 

  31. typedef struct X264Context {

  32.     AVClass        *class;

  33.     x264_param_t    params;

  34.     x264_t         *enc;

  35.     x264_picture_t  pic;

  36.     uint8_t        *sei;

  37.     int             sei_size;

  38.     AVFrame         out_pic;

  39.     char *preset;

  40.     char *tune;

  41.     char *profile;

  42.     char *level;

  43.     int fastfirstpass;

  44.     char *stats;

  45.     char *weightp;

  46.     char *x264opts;

  47. } X264Context;

  48. 

  49. static void X264_log(void *p, int level, const char *fmt, va_list args)

  50. {

  51.     static const int level_map[] = {

  52.         [X264_LOG_ERROR]   = AV_LOG_ERROR,

  53.         [X264_LOG_WARNING] = AV_LOG_WARNING,

  54.         [X264_LOG_INFO]    = AV_LOG_INFO,

  55.         [X264_LOG_DEBUG]   = AV_LOG_DEBUG

  56.     };

  57. 

  58.     if (level < 0 || level > X264_LOG_DEBUG)

  59.         return;

  60. 

  61.     av_vlog(p, level_map[level], fmt, args);

  62. }

  63. 

  64. 

  65. static int encode_nals(AVCodecContext *ctx, uint8_t *buf, int size,

  66.                        x264_nal_t *nals, int nnal, int skip_sei)

  67. {

  68.     X264Context *x4 = ctx->priv_data;

  69.     uint8_t *p = buf;

  70.     int i;

  71. 

  72.     /* Write the SEI as part of the first frame. */

  73.     if (x4->sei_size > 0 && nnal > 0) {

  74.         memcpy(p, x4->sei, x4->sei_size);

  75.         p += x4->sei_size;

  76.         x4->sei_size = 0;

  77.     }

  78. 

  79.     for (i = 0; i < nnal; i++){

  80.         /* Don't put the SEI in extradata. */

  81.         if (skip_sei && nals[i].i_type == NAL_SEI) {

  82.             x4->sei_size = nals[i].i_payload;

  83.             x4->sei      = av_malloc(x4->sei_size);

  84.             memcpy(x4->sei, nals[i].p_payload, nals[i].i_payload);

  85.             continue;

  86.         }

  87.         memcpy(p, nals[i].p_payload, nals[i].i_payload);

  88.         p += nals[i].i_payload;

  89.     }

  90. 

  91.     return p - buf;

  92. }

  93. 

  94. static int X264_frame(AVCodecContext *ctx, uint8_t *buf,

  95.                       int bufsize, void *data)

  96. {

  97.     X264Context *x4 = ctx->priv_data;

  98.     AVFrame *frame = data;

  99.     x264_nal_t *nal;

  100.     int nnal, i;

  101.     x264_picture_t pic_out;

  102. 

  103.     x264_picture_init( &x4->pic );

  104.     x4->pic.img.i_csp   = X264_CSP_I420;

  105.     x4->pic.img.i_plane = 3;

  106. 

  107.     if (frame) {

  108.         for (i = 0; i < 3; i++) {

  109.             x4->pic.img.plane[i]    = frame->data[i];

  110.             x4->pic.img.i_stride[i] = frame->linesize[i];

  111.         }

  112. 

  113.         x4->pic.i_pts  = frame->pts;

  114.         x4->pic.i_type =

  115.             frame->pict_type == AV_PICTURE_TYPE_I ? X264_TYPE_KEYFRAME :

  116.             frame->pict_type == AV_PICTURE_TYPE_P ? X264_TYPE_P :

  117.             frame->pict_type == AV_PICTURE_TYPE_B ? X264_TYPE_B :

  118.                                             X264_TYPE_AUTO;

  119.         if (x4->params.b_tff != frame->top_field_first) {

  120.             x4->params.b_tff = frame->top_field_first;

  121.             x264_encoder_reconfig(x4->enc, &x4->params);

  122.         }

  123.         if (x4->params.vui.i_sar_height != ctx->sample_aspect_ratio.den

  124.          || x4->params.vui.i_sar_width != ctx->sample_aspect_ratio.num) {

  125.             x4->params.vui.i_sar_height = ctx->sample_aspect_ratio.den;

  126.             x4->params.vui.i_sar_width = ctx->sample_aspect_ratio.num;

  127.             x264_encoder_reconfig(x4->enc, &x4->params);

  128.         }

  129.     }

  130. 

  131.     do {

  132.     if (x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL, &pic_out) < 0)

  133.         return -1;

  134. 

  135.     bufsize = encode_nals(ctx, buf, bufsize, nal, nnal, 0);

  136.     if (bufsize < 0)

  137.         return -1;

  138.     } while (!bufsize && !frame && x264_encoder_delayed_frames(x4->enc));

  139. 

  140.     /* FIXME: libx264 now provides DTS, but AVFrame doesn't have a field for it. */

  141.     x4->out_pic.pts = pic_out.i_pts;

  142. 

  143.     switch (pic_out.i_type) {

  144.     case X264_TYPE_IDR:

  145.     case X264_TYPE_I:

  146.         x4->out_pic.pict_type = AV_PICTURE_TYPE_I;

  147.         break;

  148.     case X264_TYPE_P:

  149.         x4->out_pic.pict_type = AV_PICTURE_TYPE_P;

  150.         break;

  151.     case X264_TYPE_B:

  152.     case X264_TYPE_BREF:

  153.         x4->out_pic.pict_type = AV_PICTURE_TYPE_B;

  154.         break;

  155.     }

  156. 

  157.     x4->out_pic.key_frame = pic_out.b_keyframe;

  158.     if (bufsize)

  159.         x4->out_pic.quality = (pic_out.i_qpplus1 - 1) * FF_QP2LAMBDA;

  160. 

  161.     return bufsize;

  162. }

  163. 

  164. static av_cold int X264_close(AVCodecContext *avctx)

  165. {

  166.     X264Context *x4 = avctx->priv_data;

  167. 

  168.     av_freep(&avctx->extradata);

  169.     av_free(x4->sei);

  170. 

  171.     if (x4->enc)

  172.         x264_encoder_close(x4->enc);

  173. 

  174.     return 0;

  175. }

  176. 

  177. /**

  178.  * Detect default settings and use default profile to avoid libx264 failure.

  179.  */

  180. static void check_default_settings(AVCodecContext *avctx)

  181. {

  182.     X264Context *x4 = avctx->priv_data;

  183. 

  184.     int score = 0;

  185.     score += x4->params.analyse.i_me_range == 0;

  186.     score += x4->params.rc.i_qp_step == 3;

  187.     score += x4->params.i_keyint_max == 12;

  188.     score += x4->params.rc.i_qp_min == 2;

  189.     score += x4->params.rc.i_qp_max == 31;

  190.     score += x4->params.rc.f_qcompress == 0.5;

  191.     score += fabs(x4->params.rc.f_ip_factor - 1.25) < 0.01;

  192.     score += fabs(x4->params.rc.f_pb_factor - 1.25) < 0.01;

  193.     score += x4->params.analyse.inter == 0 && x4->params.analyse.i_subpel_refine == 8;

  194.     if (score >= 5) {

  195.         av_log(avctx, AV_LOG_ERROR, "Default settings detected, using medium profile\n");

  196.         x4->preset = av_strdup("medium");

  197.         if (avctx->bit_rate == 200*1000)

  198.             avctx->crf = 23;

  199.     }

  200. }

  201. 

  202. #define OPT_STR(opt, param)                                                   \

  203.     do {                                                                      \

  204.         int ret;                                                              \

  205.         if (param && (ret = x264_param_parse(&x4->params, opt, param)) < 0) { \

  206.             if(ret == X264_PARAM_BAD_NAME)                                    \

  207.                 av_log(avctx, AV_LOG_ERROR,                                   \

  208.                         "bad option '%s': '%s'\n", opt, param);               \

  209.             else                                                              \

  210.                 av_log(avctx, AV_LOG_ERROR,                                   \

  211.                         "bad value for '%s': '%s'\n", opt, param);            \

  212.             return -1;                                                        \

  213.         }                                                                     \

  214.     } while (0);

  215. 

  216. static av_cold int X264_init(AVCodecContext *avctx)

  217. {

  218.     X264Context *x4 = avctx->priv_data;

  219. 

  220.     x4->sei_size = 0;

  221.     x264_param_default(&x4->params);

  222. 

  223.     x4->params.i_keyint_max         = avctx->gop_size;

  224. 

  225.     x4->params.i_bframe          = avctx->max_b_frames;

  226.     x4->params.b_cabac           = avctx->coder_type == FF_CODER_TYPE_AC;

  227.     x4->params.i_bframe_adaptive = avctx->b_frame_strategy;

  228.     x4->params.i_bframe_bias     = avctx->bframebias;

  229.     x4->params.i_bframe_pyramid  = avctx->flags2 & CODEC_FLAG2_BPYRAMID ? X264_B_PYRAMID_NORMAL : X264_B_PYRAMID_NONE;

  230. 

  231.     x4->params.i_keyint_min = avctx->keyint_min;

  232.     if (x4->params.i_keyint_min > x4->params.i_keyint_max)

  233.         x4->params.i_keyint_min = x4->params.i_keyint_max;

  234. 

  235.     x4->params.i_scenecut_threshold        = avctx->scenechange_threshold;

  236. 

  237.     x4->params.b_deblocking_filter         = avctx->flags & CODEC_FLAG_LOOP_FILTER;

  238.     x4->params.i_deblocking_filter_alphac0 = avctx->deblockalpha;

  239.     x4->params.i_deblocking_filter_beta    = avctx->deblockbeta;

  240. 

  241.     x4->params.rc.i_qp_min                 = avctx->qmin;

  242.     x4->params.rc.i_qp_max                 = avctx->qmax;

  243.     x4->params.rc.i_qp_step                = avctx->max_qdiff;

  244. 

  245.     x4->params.rc.f_qcompress       = avctx->qcompress; /* 0.0 => cbr, 1.0 => constant qp */

  246.     x4->params.rc.f_qblur           = avctx->qblur;     /* temporally blur quants */

  247.     x4->params.rc.f_complexity_blur = avctx->complexityblur;

  248. 

  249.     x4->params.i_frame_reference    = avctx->refs;

  250. 

  251.     x4->params.analyse.inter    = 0;

  252.     if (avctx->partitions) {

  253.         if (avctx->partitions & X264_PART_I4X4)

  254.             x4->params.analyse.inter |= X264_ANALYSE_I4x4;

  255.         if (avctx->partitions & X264_PART_I8X8)

  256.             x4->params.analyse.inter |= X264_ANALYSE_I8x8;

  257.         if (avctx->partitions & X264_PART_P8X8)

  258.             x4->params.analyse.inter |= X264_ANALYSE_PSUB16x16;

  259.         if (avctx->partitions & X264_PART_P4X4)

  260.             x4->params.analyse.inter |= X264_ANALYSE_PSUB8x8;

  261.         if (avctx->partitions & X264_PART_B8X8)

  262.             x4->params.analyse.inter |= X264_ANALYSE_BSUB16x16;

  263.     }

  264. 

  265.     x4->params.analyse.i_direct_mv_pred  = avctx->directpred;

  266. 

  267.     x4->params.analyse.b_weighted_bipred = avctx->flags2 & CODEC_FLAG2_WPRED;

  268. 

  269.     if (avctx->me_method == ME_EPZS)

  270.         x4->params.analyse.i_me_method = X264_ME_DIA;

  271.     else if (avctx->me_method == ME_HEX)

  272.         x4->params.analyse.i_me_method = X264_ME_HEX;

  273.     else if (avctx->me_method == ME_UMH)

  274.         x4->params.analyse.i_me_method = X264_ME_UMH;

  275.     else if (avctx->me_method == ME_FULL)

  276.         x4->params.analyse.i_me_method = X264_ME_ESA;

  277.     else if (avctx->me_method == ME_TESA)

  278.         x4->params.analyse.i_me_method = X264_ME_TESA;

  279.     else x4->params.analyse.i_me_method = X264_ME_HEX;

  280. 

  281.     x4->params.rc.i_aq_mode               = avctx->aq_mode;

  282.     x4->params.rc.f_aq_strength           = avctx->aq_strength;

  283.     x4->params.rc.i_lookahead             = avctx->rc_lookahead;

  284. 

  285.     x4->params.analyse.b_psy              = avctx->flags2 & CODEC_FLAG2_PSY;

  286.     x4->params.analyse.f_psy_rd           = avctx->psy_rd;

  287.     x4->params.analyse.f_psy_trellis      = avctx->psy_trellis;

  288. 

  289.     x4->params.analyse.i_me_range         = avctx->me_range;

  290.     x4->params.analyse.i_subpel_refine    = avctx->me_subpel_quality;

  291. 

  292.     x4->params.analyse.b_mixed_references = avctx->flags2 & CODEC_FLAG2_MIXED_REFS;

  293.     x4->params.analyse.b_chroma_me        = avctx->me_cmp & FF_CMP_CHROMA;

  294.     x4->params.analyse.b_transform_8x8    = avctx->flags2 & CODEC_FLAG2_8X8DCT;

  295.     x4->params.analyse.b_fast_pskip       = avctx->flags2 & CODEC_FLAG2_FASTPSKIP;

  296. 

  297.     x4->params.analyse.i_trellis          = avctx->trellis;

  298.     x4->params.analyse.i_noise_reduction  = avctx->noise_reduction;

  299. 

  300.     x4->params.rc.b_mb_tree               = !!(avctx->flags2 & CODEC_FLAG2_MBTREE);

  301.     x4->params.rc.f_ip_factor             = 1 / fabs(avctx->i_quant_factor);

  302.     x4->params.rc.f_pb_factor             = avctx->b_quant_factor;

  303.     x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;

  304. 

  305.     if (!x4->preset)

  306.         check_default_settings(avctx);

  307. 

  308.     if (x4->preset || x4->tune) {

  309.         if (x264_param_default_preset(&x4->params, x4->preset, x4->tune) < 0) {

  310.             av_log(avctx, AV_LOG_ERROR, "Error setting preset/tune %s/%s.\n", x4->preset, x4->tune);

  311.             return AVERROR(EINVAL);

  312.         }

  313.     }

  314. 

  315.     x4->params.pf_log               = X264_log;

  316.     x4->params.p_log_private        = avctx;

  317.     x4->params.i_log_level          = X264_LOG_DEBUG;

  318. 

  319.     OPT_STR("weightp", x4->weightp);

  320. 

  321.     x4->params.b_intra_refresh      = avctx->flags2 & CODEC_FLAG2_INTRA_REFRESH;

  322.     if (avctx->bit_rate) {

  323.         x4->params.rc.i_bitrate   = avctx->bit_rate / 1000;

  324.         x4->params.rc.i_rc_method = X264_RC_ABR;

  325.     }

  326.     x4->params.rc.i_vbv_buffer_size = avctx->rc_buffer_size / 1000;

  327.     x4->params.rc.i_vbv_max_bitrate = avctx->rc_max_rate    / 1000;

  328.     x4->params.rc.b_stat_write      = avctx->flags & CODEC_FLAG_PASS1;

  329.     if (avctx->flags & CODEC_FLAG_PASS2) {

  330.         x4->params.rc.b_stat_read = 1;

  331.     } else {

  332.         if (avctx->crf) {

  333.             x4->params.rc.i_rc_method   = X264_RC_CRF;

  334.             x4->params.rc.f_rf_constant = avctx->crf;

  335.             x4->params.rc.f_rf_constant_max = avctx->crf_max;

  336.         } else if (avctx->cqp > -1) {

  337.             x4->params.rc.i_rc_method   = X264_RC_CQP;

  338.             x4->params.rc.i_qp_constant = avctx->cqp;

  339.         }

  340.     }

  341. 

  342.     OPT_STR("stats", x4->stats);

  343. 

  344.     if (avctx->rc_buffer_size && avctx->rc_initial_buffer_occupancy &&

  345.         (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {

  346.         x4->params.rc.f_vbv_buffer_init =

  347.             (float)avctx->rc_initial_buffer_occupancy / avctx->rc_buffer_size;

  348.     }

  349. 

  350.     OPT_STR("level", x4->level);

  351. 

  352.     if(x4->x264opts){

  353.         const char *p= x4->x264opts;

  354.         while(p){

  355.             char param[256]={0}, val[256]={0};

  356.             sscanf(p, "%255[^:=]=%255[^:]", param, val);

  357.             OPT_STR(param, val);

  358.             p= strchr(p, ':');

  359.             p+=!!p;

  360.         }

  361.     }

  362. 

  363.     if (x4->fastfirstpass)

  364.         x264_param_apply_fastfirstpass(&x4->params);

  365. 

  366.     if (x4->profile)

  367.         if (x264_param_apply_profile(&x4->params, x4->profile) < 0) {

  368.             av_log(avctx, AV_LOG_ERROR, "Error setting profile %s.\n", x4->profile);

  369.             return AVERROR(EINVAL);

  370.         }

  371. 

  372.     x4->params.i_width          = avctx->width;

  373.     x4->params.i_height         = avctx->height;

  374.     x4->params.vui.i_sar_width  = avctx->sample_aspect_ratio.num;

  375.     x4->params.vui.i_sar_height = avctx->sample_aspect_ratio.den;

  376.     x4->params.i_fps_num = x4->params.i_timebase_den = avctx->time_base.den;

  377.     x4->params.i_fps_den = x4->params.i_timebase_num = avctx->time_base.num;

  378. 

  379.     x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;

  380.     x4->params.analyse.b_ssim = avctx->flags2 & CODEC_FLAG2_SSIM;

  381. 

  382.     x4->params.b_aud          = avctx->flags2 & CODEC_FLAG2_AUD;

  383. 

  384.     x4->params.i_threads      = avctx->thread_count;

  385. 

  386.     x4->params.b_interlaced   = avctx->flags & CODEC_FLAG_INTERLACED_DCT;

  387. 

  388. //    x4->params.b_open_gop     = !(avctx->flags & CODEC_FLAG_CLOSED_GOP);

  389. 

  390.     x4->params.i_slice_count  = avctx->slices;

  391. 

  392.     x4->params.vui.b_fullrange = avctx->pix_fmt == PIX_FMT_YUVJ420P;

  393. 

  394.     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER)

  395.         x4->params.b_repeat_headers = 0;

  396. 

  397.     // update AVCodecContext with x264 parameters

  398.     avctx->has_b_frames = x4->params.i_bframe ?

  399.         x4->params.i_bframe_pyramid ? 2 : 1 : 0;

  400.     avctx->bit_rate = x4->params.rc.i_bitrate*1000;

  401.     avctx->crf = x4->params.rc.f_rf_constant;

  402. 

  403.     x4->enc = x264_encoder_open(&x4->params);

  404.     if (!x4->enc)

  405.         return -1;

  406. 

  407.     avctx->coded_frame = &x4->out_pic;

  408. 

  409.     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {

  410.         x264_nal_t *nal;

  411.         int nnal, s, i;

  412. 

  413.         s = x264_encoder_headers(x4->enc, &nal, &nnal);

  414. 

  415.         for (i = 0; i < nnal; i++)

  416.             if (nal[i].i_type == NAL_SEI)

  417.                 av_log(avctx, AV_LOG_INFO, "%s\n", nal[i].p_payload+25);

  418. 

  419.         avctx->extradata      = av_malloc(s);

  420.         avctx->extradata_size = encode_nals(avctx, avctx->extradata, s, nal, nnal, 1);

  421.     }

  422. 

  423.     return 0;

  424. }

  425. 

  426. #define OFFSET(x) offsetof(X264Context,x)

  427. #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

  428. 

  429. static const AVOption options[] = {

  430.     { "preset",        "Set the encoding preset (cf. x264 --fullhelp)",   OFFSET(preset),        FF_OPT_TYPE_STRING, { .str = "medium" }, 0, 0, VE},

  431.     { "tune",          "Tune the encoding params (cf. x264 --fullhelp)",  OFFSET(tune),          FF_OPT_TYPE_STRING, { 0 }, 0, 0, VE},

  432.     { "profile",       "Set profile restrictions (cf. x264 --fullhelp) ", OFFSET(profile),       FF_OPT_TYPE_STRING, { 0 }, 0, 0, VE},

  433.     { "fastfirstpass", "Use fast settings when encoding first pass",      OFFSET(fastfirstpass), FF_OPT_TYPE_INT,    { 1 }, 0, 1, VE},

  434.     {"level", "Specify level (as defined by Annex A)", OFFSET(level), FF_OPT_TYPE_STRING, {.str=NULL}, 0, 0, VE},

  435.     {"passlogfile", "Filename for 2 pass stats", OFFSET(stats), FF_OPT_TYPE_STRING, {.str=NULL}, 0, 0, VE},

  436.     {"wpredp", "Weighted prediction for P-frames", OFFSET(weightp), FF_OPT_TYPE_STRING, {.str=NULL}, 0, 0, VE},

  437.     {"x264opts", "x264 options", OFFSET(x264opts), FF_OPT_TYPE_STRING, {.str=NULL}, 0, 0, VE},

  438.     { NULL },

  439. };

  440. 

  441. static const AVClass class = {

  442.     .class_name = "libx264",

  443.     .item_name  = av_default_item_name,

  444.     .option     = options,

  445.     .version    = LIBAVUTIL_VERSION_INT,

  446. };

  447. 

  448. static const AVCodecDefault x264_defaults[] = {

  449.     { "b",                "0" },

  450.     { NULL },

  451. };

  452. 

  453. AVCodec ff_libx264_encoder = {

  454.     .name           = "libx264",

  455.     .type           = AVMEDIA_TYPE_VIDEO,

  456.     .id             = CODEC_ID_H264,

  457.     .priv_data_size = sizeof(X264Context),

  458.     .init           = X264_init,

  459.     .encode         = X264_frame,

  460.     .close          = X264_close,

  461.     .capabilities   = CODEC_CAP_DELAY,

  462.     .pix_fmts       = (const enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_YUVJ420P, PIX_FMT_NONE },

  463.     .long_name      = NULL_IF_CONFIG_SMALL("libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),

  464.     .priv_class     = &class,

  465.     .defaults       = x264_defaults,

  466. };