FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
libx265.c
Go to the documentation of this file.
1 /*
2  * libx265 encoder
3  *
4  * Copyright (c) 2013-2014 Derek Buitenhuis
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #if defined(_MSC_VER)
24 #define X265_API_IMPORTS 1
25 #endif
26 
27 #include <x265.h>
28 
29 #include "libavutil/internal.h"
30 #include "libavutil/common.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/pixdesc.h"
33 #include "avcodec.h"
34 #include "internal.h"
35 
36 typedef struct libx265Context {
37  const AVClass *class;
38 
39  x265_encoder *encoder;
40  x265_param *params;
41 
42  char *preset;
43  char *tune;
44  char *x265_opts;
46 
47 static int is_keyframe(NalUnitType naltype)
48 {
49  switch (naltype) {
50  case NAL_UNIT_CODED_SLICE_BLA_W_LP:
51  case NAL_UNIT_CODED_SLICE_BLA_W_RADL:
52  case NAL_UNIT_CODED_SLICE_BLA_N_LP:
53  case NAL_UNIT_CODED_SLICE_IDR_W_RADL:
54  case NAL_UNIT_CODED_SLICE_IDR_N_LP:
55  case NAL_UNIT_CODED_SLICE_CRA:
56  return 1;
57  default:
58  return 0;
59  }
60 }
61 
63 {
64  libx265Context *ctx = avctx->priv_data;
65 
66  av_frame_free(&avctx->coded_frame);
67 
68  x265_param_free(ctx->params);
69 
70  if (ctx->encoder)
71  x265_encoder_close(ctx->encoder);
72 
73  return 0;
74 }
75 
77 {
78  libx265Context *ctx = avctx->priv_data;
79  x265_nal *nal;
80  char sar[12];
81  int sar_num, sar_den;
82  int nnal;
83 
86  av_log(avctx, AV_LOG_ERROR,
87  "4:2:2 and 4:4:4 support is not fully defined for HEVC yet. "
88  "Set -strict experimental to encode anyway.\n");
89  return AVERROR(ENOSYS);
90  }
91 
92  avctx->coded_frame = av_frame_alloc();
93  if (!avctx->coded_frame) {
94  av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
95  return AVERROR(ENOMEM);
96  }
97 
98  ctx->params = x265_param_alloc();
99  if (!ctx->params) {
100  av_log(avctx, AV_LOG_ERROR, "Could not allocate x265 param structure.\n");
101  return AVERROR(ENOMEM);
102  }
103 
104  if (x265_param_default_preset(ctx->params, ctx->preset, ctx->tune) < 0) {
105  av_log(avctx, AV_LOG_ERROR, "Invalid preset or tune.\n");
106  return AVERROR(EINVAL);
107  }
108 
109  ctx->params->frameNumThreads = avctx->thread_count;
110  ctx->params->fpsNum = avctx->time_base.den;
111  ctx->params->fpsDenom = avctx->time_base.num * avctx->ticks_per_frame;
112  ctx->params->sourceWidth = avctx->width;
113  ctx->params->sourceHeight = avctx->height;
114 
115  if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) {
116  av_reduce(&sar_num, &sar_den,
117  avctx->sample_aspect_ratio.num,
118  avctx->sample_aspect_ratio.den, 65535);
119  snprintf(sar, sizeof(sar), "%d:%d", sar_num, sar_den);
120  if (x265_param_parse(ctx->params, "sar", sar) == X265_PARAM_BAD_VALUE) {
121  av_log(avctx, AV_LOG_ERROR, "Invalid SAR: %d:%d.\n", sar_num, sar_den);
122  return AVERROR_INVALIDDATA;
123  }
124  }
125 
126  switch (avctx->pix_fmt) {
127  case AV_PIX_FMT_YUV420P:
129  ctx->params->internalCsp = X265_CSP_I420;
130  break;
131  case AV_PIX_FMT_YUV422P:
133  ctx->params->internalCsp = X265_CSP_I422;
134  break;
135  case AV_PIX_FMT_YUV444P:
137  ctx->params->internalCsp = X265_CSP_I444;
138  break;
139  }
140 
141  if (avctx->bit_rate > 0) {
142  ctx->params->rc.bitrate = avctx->bit_rate / 1000;
143  ctx->params->rc.rateControlMode = X265_RC_ABR;
144  }
145 
146  if (!(avctx->flags & CODEC_FLAG_GLOBAL_HEADER))
147  ctx->params->bRepeatHeaders = 1;
148 
149  if (ctx->x265_opts) {
150  AVDictionary *dict = NULL;
151  AVDictionaryEntry *en = NULL;
152 
153  if (!av_dict_parse_string(&dict, ctx->x265_opts, "=", ":", 0)) {
154  while ((en = av_dict_get(dict, "", en, AV_DICT_IGNORE_SUFFIX))) {
155  int parse_ret = x265_param_parse(ctx->params, en->key, en->value);
156 
157  switch (parse_ret) {
158  case X265_PARAM_BAD_NAME:
159  av_log(avctx, AV_LOG_WARNING,
160  "Unknown option: %s.\n", en->key);
161  break;
162  case X265_PARAM_BAD_VALUE:
163  av_log(avctx, AV_LOG_WARNING,
164  "Invalid value for %s: %s.\n", en->key, en->value);
165  break;
166  default:
167  break;
168  }
169  }
170  av_dict_free(&dict);
171  }
172  }
173 
174  ctx->encoder = x265_encoder_open(ctx->params);
175  if (!ctx->encoder) {
176  av_log(avctx, AV_LOG_ERROR, "Cannot open libx265 encoder.\n");
177  libx265_encode_close(avctx);
178  return AVERROR_INVALIDDATA;
179  }
180 
181  if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
182  avctx->extradata_size = x265_encoder_headers(ctx->encoder, &nal, &nnal);
183  if (avctx->extradata_size <= 0) {
184  av_log(avctx, AV_LOG_ERROR, "Cannot encode headers.\n");
185  libx265_encode_close(avctx);
186  return AVERROR_INVALIDDATA;
187  }
188 
190  if (!avctx->extradata) {
191  av_log(avctx, AV_LOG_ERROR,
192  "Cannot allocate HEVC header of size %d.\n", avctx->extradata_size);
193  libx265_encode_close(avctx);
194  return AVERROR(ENOMEM);
195  }
196 
197  memcpy(avctx->extradata, nal[0].payload, avctx->extradata_size);
198  }
199 
200  return 0;
201 }
202 
204  const AVFrame *pic, int *got_packet)
205 {
206  libx265Context *ctx = avctx->priv_data;
207  x265_picture x265pic;
208  x265_picture x265pic_out = { { 0 } };
209  x265_nal *nal;
210  uint8_t *dst;
211  int payload = 0;
212  int nnal;
213  int ret;
214  int i;
215 
216  x265_picture_init(ctx->params, &x265pic);
217 
218  if (pic) {
219  for (i = 0; i < 3; i++) {
220  x265pic.planes[i] = pic->data[i];
221  x265pic.stride[i] = pic->linesize[i];
222  }
223 
224  x265pic.pts = pic->pts;
225  x265pic.bitDepth = av_pix_fmt_desc_get(avctx->pix_fmt)->comp[0].depth_minus1 + 1;
226  }
227 
228  ret = x265_encoder_encode(ctx->encoder, &nal, &nnal,
229  pic ? &x265pic : NULL, &x265pic_out);
230  if (ret < 0)
231  return AVERROR_EXTERNAL;
232 
233  if (!nnal)
234  return 0;
235 
236  for (i = 0; i < nnal; i++)
237  payload += nal[i].sizeBytes;
238 
239  ret = ff_alloc_packet(pkt, payload);
240  if (ret < 0) {
241  av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
242  return ret;
243  }
244  dst = pkt->data;
245 
246  for (i = 0; i < nnal; i++) {
247  memcpy(dst, nal[i].payload, nal[i].sizeBytes);
248  dst += nal[i].sizeBytes;
249 
250  if (is_keyframe(nal[i].type))
251  pkt->flags |= AV_PKT_FLAG_KEY;
252  }
253 
254  pkt->pts = x265pic_out.pts;
255  pkt->dts = x265pic_out.dts;
256 
257  *got_packet = 1;
258  return 0;
259 }
260 
261 static const enum AVPixelFormat x265_csp_eight[] = {
266 };
267 
268 static const enum AVPixelFormat x265_csp_twelve[] = {
276 };
277 
279 {
280  if (x265_max_bit_depth == 8)
281  codec->pix_fmts = x265_csp_eight;
282  else if (x265_max_bit_depth == 12)
283  codec->pix_fmts = x265_csp_twelve;
284 }
285 
286 #define OFFSET(x) offsetof(libx265Context, x)
287 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
288 static const AVOption options[] = {
289  { "preset", "set the x265 preset", OFFSET(preset), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
290  { "tune", "set the x265 tune parameter", OFFSET(tune), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
291  { "x265-params", "set the x265 configuration using a :-separated list of key=value parameters", OFFSET(x265_opts), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VE },
292  { NULL }
293 };
294 
295 static const AVClass class = {
296  .class_name = "libx265",
297  .item_name = av_default_item_name,
298  .option = options,
300 };
301 
303  .name = "libx265",
304  .long_name = NULL_IF_CONFIG_SMALL("libx265 H.265 / HEVC"),
305  .type = AVMEDIA_TYPE_VIDEO,
306  .id = AV_CODEC_ID_HEVC,
307  .init = libx265_encode_init,
308  .init_static_data = libx265_encode_init_csp,
309  .encode2 = libx265_encode_frame,
310  .close = libx265_encode_close,
311  .priv_data_size = sizeof(libx265Context),
312  .priv_class = &class,
313  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_AUTO_THREADS,
314 };