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
X264_log(void * p,int level,const char * fmt,va_list args)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
encode_nals(uint8_t * buf,int size,x264_nal_t * nals,int nnal)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
X264_frame(AVCodecContext * ctx,uint8_t * buf,int bufsize,void * data)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
X264_close(AVCodecContext * avctx)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
X264_init(AVCodecContext * avctx)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 x4->params.analyse.i_me_method = X264_ME_HEX;
224 
225     x4->params.analyse.i_me_range = avctx->me_range;
226     x4->params.analyse.i_subpel_refine = avctx->me_subpel_quality;
227 
228     x4->params.analyse.b_bidir_me = (avctx->bidir_refine > 0);
229     x4->params.analyse.b_bframe_rdo = (avctx->flags2 & CODEC_FLAG2_BRDO);
230     x4->params.analyse.b_mixed_references =
231         (avctx->flags2 & CODEC_FLAG2_MIXED_REFS);
232     x4->params.analyse.b_chroma_me = (avctx->me_cmp & FF_CMP_CHROMA);
233     x4->params.analyse.b_transform_8x8 = (avctx->flags2 & CODEC_FLAG2_8X8DCT);
234     x4->params.analyse.b_fast_pskip = (avctx->flags2 & CODEC_FLAG2_FASTPSKIP);
235 
236     x4->params.analyse.i_trellis = avctx->trellis;
237     x4->params.analyse.i_noise_reduction = avctx->noise_reduction;
238 
239     if(avctx->level > 0) x4->params.i_level_idc = avctx->level;
240 
241     x4->params.rc.f_rate_tolerance =
242         (float)avctx->bit_rate_tolerance/avctx->bit_rate;
243 
244     if((avctx->rc_buffer_size != 0) &&
245             (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)){
246         x4->params.rc.f_vbv_buffer_init =
247             (float)avctx->rc_initial_buffer_occupancy/avctx->rc_buffer_size;
248     }
249     else x4->params.rc.f_vbv_buffer_init = 0.9;
250 
251     x4->params.rc.f_ip_factor = 1/fabs(avctx->i_quant_factor);
252     x4->params.rc.f_pb_factor = avctx->b_quant_factor;
253     x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
254     x4->params.rc.psz_rc_eq = avctx->rc_eq;
255 
256     x4->params.analyse.b_psnr = (avctx->flags & CODEC_FLAG_PSNR);
257     x4->params.i_log_level = X264_LOG_DEBUG;
258 
259     x4->params.b_aud = (avctx->flags2 & CODEC_FLAG2_AUD);
260 
261     x4->params.i_threads = avctx->thread_count;
262 
263     if(avctx->flags & CODEC_FLAG_GLOBAL_HEADER){
264         x4->params.b_repeat_headers = 0;
265     }
266 
267     x4->enc = x264_encoder_open(&x4->params);
268     if(!x4->enc)
269         return -1;
270 
271     avctx->coded_frame = &x4->out_pic;
272 
273     if(avctx->flags & CODEC_FLAG_GLOBAL_HEADER){
274         x264_nal_t *nal;
275         int nnal, i, s = 0;
276 
277         x264_encoder_headers(x4->enc, &nal, &nnal);
278 
279         /* 5 bytes NAL header + worst case escaping */
280         for(i = 0; i < nnal; i++)
281             s += 5 + nal[i].i_payload * 4 / 3;
282 
283         avctx->extradata = av_malloc(s);
284         avctx->extradata_size = encode_nals(avctx->extradata, s, nal, nnal);
285     }
286 
287     return 0;
288 }
289 
290 AVCodec libx264_encoder = {
291     .name = "libx264",
292     .type = CODEC_TYPE_VIDEO,
293     .id = CODEC_ID_H264,
294     .priv_data_size = sizeof(X264Context),
295     .init = X264_init,
296     .encode = X264_frame,
297     .close = X264_close,
298     .capabilities = CODEC_CAP_DELAY,
299     .pix_fmts = (enum PixelFormat[]) { PIX_FMT_YUV420P, -1 },
300     .long_name = "libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
301 };
302