Libav
libopenjpegenc.c
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1 /*
2  * JPEG 2000 encoding support via OpenJPEG
3  * Copyright (c) 2011 Michael Bradshaw <mbradshaw@sorensonmedia.com>
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
27 #define OPJ_STATIC
28 #include <openjpeg.h>
29 
30 #include "libavutil/common.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/opt.h"
34 #include "avcodec.h"
35 #include "internal.h"
36 
37 typedef struct {
39  opj_image_t *image;
40  opj_cparameters_t enc_params;
41  opj_cinfo_t *compress;
42  opj_event_mgr_t event_mgr;
43  int format;
44  int profile;
48  int numlayers;
53 
54 static void error_callback(const char *msg, void *data)
55 {
56  av_log(data, AV_LOG_ERROR, "%s\n", msg);
57 }
58 
59 static void warning_callback(const char *msg, void *data)
60 {
61  av_log(data, AV_LOG_WARNING, "%s\n", msg);
62 }
63 
64 static void info_callback(const char *msg, void *data)
65 {
66  av_log(data, AV_LOG_DEBUG, "%s\n", msg);
67 }
68 
69 static opj_image_t *libopenjpeg_create_image(AVCodecContext *avctx,
70  opj_cparameters_t *parameters)
71 {
72  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
73  opj_image_cmptparm_t *cmptparm;
74  OPJ_COLOR_SPACE color_space;
75  opj_image_t *img;
76  int i;
77  int sub_dx[4];
78  int sub_dy[4];
79  int numcomps = desc->nb_components;
80 
81  sub_dx[0] =
82  sub_dx[3] = 1;
83  sub_dy[0] =
84  sub_dy[3] = 1;
85  sub_dx[1] =
86  sub_dx[2] = 1 << desc->log2_chroma_w;
87  sub_dy[1] =
88  sub_dy[2] = 1 << desc->log2_chroma_h;
89 
90  switch (avctx->pix_fmt) {
91  case AV_PIX_FMT_GRAY8:
92  case AV_PIX_FMT_GRAY16:
93  case AV_PIX_FMT_YA8:
94  color_space = CLRSPC_GRAY;
95  break;
96  case AV_PIX_FMT_RGB24:
97  case AV_PIX_FMT_RGBA:
98  case AV_PIX_FMT_RGB48:
99  case AV_PIX_FMT_RGBA64:
100  color_space = CLRSPC_SRGB;
101  break;
102  case AV_PIX_FMT_YUV410P:
103  case AV_PIX_FMT_YUV411P:
104  case AV_PIX_FMT_YUV420P:
105  case AV_PIX_FMT_YUV422P:
106  case AV_PIX_FMT_YUV440P:
107  case AV_PIX_FMT_YUV444P:
108  case AV_PIX_FMT_YUVA420P:
109  case AV_PIX_FMT_YUV420P9:
110  case AV_PIX_FMT_YUV422P9:
111  case AV_PIX_FMT_YUV444P9:
118  color_space = CLRSPC_SYCC;
119  break;
120  default:
121  av_log(avctx, AV_LOG_ERROR,
122  "The requested pixel format '%s' is not supported\n",
123  av_get_pix_fmt_name(avctx->pix_fmt));
124  return NULL;
125  }
126 
127  cmptparm = av_mallocz(numcomps * sizeof(*cmptparm));
128  if (!cmptparm) {
129  av_log(avctx, AV_LOG_ERROR, "Not enough memory");
130  return NULL;
131  }
132 
133  for (i = 0; i < numcomps; i++) {
134  cmptparm[i].prec = desc->comp[i].depth_minus1 + 1;
135  cmptparm[i].bpp = desc->comp[i].depth_minus1 + 1;
136  cmptparm[i].sgnd = 0;
137  cmptparm[i].dx = sub_dx[i];
138  cmptparm[i].dy = sub_dy[i];
139  cmptparm[i].w = avctx->width / sub_dx[i];
140  cmptparm[i].h = avctx->height / sub_dy[i];
141  }
142 
143  img = opj_image_create(numcomps, cmptparm, color_space);
144  av_freep(&cmptparm);
145  return img;
146 }
147 
149 {
150  LibOpenJPEGContext *ctx = avctx->priv_data;
151  int err = AVERROR(ENOMEM);
152 
153  opj_set_default_encoder_parameters(&ctx->enc_params);
154 
155  ctx->enc_params.cp_rsiz = ctx->profile;
156  ctx->enc_params.mode = !!avctx->global_quality;
157  ctx->enc_params.cp_cinema = ctx->cinema_mode;
158  ctx->enc_params.prog_order = ctx->prog_order;
159  ctx->enc_params.numresolution = ctx->numresolution;
160  ctx->enc_params.cp_disto_alloc = ctx->disto_alloc;
161  ctx->enc_params.cp_fixed_alloc = ctx->fixed_alloc;
162  ctx->enc_params.cp_fixed_quality = ctx->fixed_quality;
163  ctx->enc_params.tcp_numlayers = ctx->numlayers;
164  ctx->enc_params.tcp_rates[0] = FFMAX(avctx->compression_level, 0) * 2;
165 
166  ctx->compress = opj_create_compress(ctx->format);
167  if (!ctx->compress) {
168  av_log(avctx, AV_LOG_ERROR, "Error creating the compressor\n");
169  return AVERROR(ENOMEM);
170  }
171 
172  avctx->coded_frame = av_frame_alloc();
173  if (!avctx->coded_frame) {
174  av_log(avctx, AV_LOG_ERROR, "Error allocating coded frame\n");
175  goto fail;
176  }
177 
178  ctx->image = libopenjpeg_create_image(avctx, &ctx->enc_params);
179  if (!ctx->image) {
180  av_log(avctx, AV_LOG_ERROR, "Error creating the mj2 image\n");
181  err = AVERROR(EINVAL);
182  goto fail;
183  }
184 
185  ctx->event_mgr.info_handler = info_callback;
186  ctx->event_mgr.error_handler = error_callback;
187  ctx->event_mgr.warning_handler = warning_callback;
188  opj_set_event_mgr((opj_common_ptr) ctx->compress, &ctx->event_mgr, avctx);
189 
190  return 0;
191 
192 fail:
193  av_freep(&ctx->compress);
194  av_freep(&avctx->coded_frame);
195  return err;
196 }
197 
199  const AVFrame *frame, opj_image_t *image)
200 {
201  int compno;
202  int x, y;
203  int image_index, frame_index;
204  const int numcomps = image->numcomps;
205 
206  for (compno = 0; compno < numcomps; ++compno)
207  for (y = 0; y < avctx->height; ++y) {
208  image_index = y * avctx->width;
209  frame_index = y * frame->linesize[0] + compno;
210  for (x = 0; x < avctx->width; ++x) {
211  image->comps[compno].data[image_index++] =
212  frame->data[0][frame_index];
213  frame_index += numcomps;
214  }
215  }
216 }
217 
219  const AVFrame *frame, opj_image_t *image)
220 {
221  int compno;
222  int x, y;
223  int image_index, frame_index;
224  const int numcomps = image->numcomps;
225  uint16_t *frame_ptr = (uint16_t *)frame->data[0];
226 
227  for (compno = 0; compno < numcomps; ++compno)
228  for (y = 0; y < avctx->height; ++y) {
229  image_index = y * avctx->width;
230  frame_index = y * (frame->linesize[0] / 2) + compno;
231  for (x = 0; x < avctx->width; ++x) {
232  image->comps[compno].data[image_index++] =
233  frame_ptr[frame_index];
234  frame_index += numcomps;
235  }
236  }
237 }
238 
240  const AVFrame *frame, opj_image_t *image)
241 {
242  int compno;
243  int x, y;
244  int width, height;
245  int image_index, frame_index;
246  const int numcomps = image->numcomps;
247 
248  for (compno = 0; compno < numcomps; ++compno) {
249  width = avctx->width / image->comps[compno].dx;
250  height = avctx->height / image->comps[compno].dy;
251  for (y = 0; y < height; ++y) {
252  image_index = y * width;
253  frame_index = y * frame->linesize[compno];
254  for (x = 0; x < width; ++x)
255  image->comps[compno].data[image_index++] =
256  frame->data[compno][frame_index++];
257  }
258  }
259 }
260 
262  const AVFrame *frame,
263  opj_image_t *image)
264 {
265  int compno;
266  int x, y;
267  int width, height;
268  int image_index, frame_index;
269  const int numcomps = image->numcomps;
270  uint16_t *frame_ptr;
271 
272  for (compno = 0; compno < numcomps; ++compno) {
273  width = avctx->width / image->comps[compno].dx;
274  height = avctx->height / image->comps[compno].dy;
275  frame_ptr = (uint16_t *)frame->data[compno];
276  for (y = 0; y < height; ++y) {
277  image_index = y * width;
278  frame_index = y * (frame->linesize[compno] / 2);
279  for (x = 0; x < width; ++x)
280  image->comps[compno].data[image_index++] =
281  frame_ptr[frame_index++];
282  }
283  }
284 }
285 
287  const AVFrame *frame, int *got_packet)
288 {
289  LibOpenJPEGContext *ctx = avctx->priv_data;
290  opj_cinfo_t *compress = ctx->compress;
291  opj_image_t *image = ctx->image;
292  opj_cio_t *stream;
293  int ret, len;
294 
295  // x0, y0 is the top left corner of the image
296  // x1, y1 is the width, height of the reference grid
297  image->x0 = 0;
298  image->y0 = 0;
299  image->x1 = (avctx->width - 1) * ctx->enc_params.subsampling_dx + 1;
300  image->y1 = (avctx->height - 1) * ctx->enc_params.subsampling_dy + 1;
301 
302  switch (avctx->pix_fmt) {
303  case AV_PIX_FMT_RGB24:
304  case AV_PIX_FMT_RGBA:
305  case AV_PIX_FMT_YA8:
306  libopenjpeg_copy_packed8(avctx, frame, image);
307  break;
308  case AV_PIX_FMT_RGB48:
309  case AV_PIX_FMT_RGBA64:
310  libopenjpeg_copy_packed16(avctx, frame, image);
311  break;
312  case AV_PIX_FMT_GRAY8:
313  case AV_PIX_FMT_YUV410P:
314  case AV_PIX_FMT_YUV411P:
315  case AV_PIX_FMT_YUV420P:
316  case AV_PIX_FMT_YUV422P:
317  case AV_PIX_FMT_YUV440P:
318  case AV_PIX_FMT_YUV444P:
319  case AV_PIX_FMT_YUVA420P:
320  libopenjpeg_copy_unpacked8(avctx, frame, image);
321  break;
322  case AV_PIX_FMT_GRAY16:
323  case AV_PIX_FMT_YUV420P9:
324  case AV_PIX_FMT_YUV422P9:
325  case AV_PIX_FMT_YUV444P9:
332  libopenjpeg_copy_unpacked16(avctx, frame, image);
333  break;
334  default:
335  av_log(avctx, AV_LOG_ERROR,
336  "The frame's pixel format '%s' is not supported\n",
337  av_get_pix_fmt_name(avctx->pix_fmt));
338  return AVERROR(EINVAL);
339  break;
340  }
341 
342  opj_setup_encoder(compress, &ctx->enc_params, image);
343  stream = opj_cio_open((opj_common_ptr) compress, NULL, 0);
344  if (!stream) {
345  av_log(avctx, AV_LOG_ERROR, "Error creating the cio stream\n");
346  return AVERROR(ENOMEM);
347  }
348 
349  if (!opj_encode(compress, stream, image, NULL)) {
350  opj_cio_close(stream);
351  av_log(avctx, AV_LOG_ERROR, "Error during the opj encode\n");
352  return -1;
353  }
354 
355  len = cio_tell(stream);
356  if ((ret = ff_alloc_packet(pkt, len)) < 0) {
357  opj_cio_close(stream);
358  return ret;
359  }
360 
361  memcpy(pkt->data, stream->buffer, len);
362  pkt->flags |= AV_PKT_FLAG_KEY;
363  *got_packet = 1;
364  opj_cio_close(stream);
365  return 0;
366 }
367 
369 {
370  LibOpenJPEGContext *ctx = avctx->priv_data;
371 
372  opj_destroy_compress(ctx->compress);
373  opj_image_destroy(ctx->image);
374  av_freep(&avctx->coded_frame);
375  return 0;
376 }
377 
378 #define OFFSET(x) offsetof(LibOpenJPEGContext, x)
379 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
380 static const AVOption options[] = {
381  { "format", "Codec Format", OFFSET(format), AV_OPT_TYPE_INT, { .i64 = CODEC_JP2 }, CODEC_J2K, CODEC_JP2, VE, "format" },
382  { "j2k", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CODEC_J2K }, 0, 0, VE, "format" },
383  { "jp2", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CODEC_JP2 }, 0, 0, VE, "format" },
384  { "profile", NULL, OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = STD_RSIZ }, STD_RSIZ, CINEMA4K, VE, "profile" },
385  { "jpeg2000", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = STD_RSIZ }, 0, 0, VE, "profile" },
386  { "cinema2k", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CINEMA2K }, 0, 0, VE, "profile" },
387  { "cinema4k", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CINEMA4K }, 0, 0, VE, "profile" },
388  { "cinema_mode", "Digital Cinema", OFFSET(cinema_mode), AV_OPT_TYPE_INT, { .i64 = OFF }, OFF, CINEMA4K_24, VE, "cinema_mode" },
389  { "off", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = OFF }, 0, 0, VE, "cinema_mode" },
390  { "2k_24", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CINEMA2K_24 }, 0, 0, VE, "cinema_mode" },
391  { "2k_48", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CINEMA2K_48 }, 0, 0, VE, "cinema_mode" },
392  { "4k_24", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CINEMA4K_24 }, 0, 0, VE, "cinema_mode" },
393  { "prog_order", "Progression Order", OFFSET(prog_order), AV_OPT_TYPE_INT, { .i64 = LRCP }, LRCP, CPRL, VE, "prog_order" },
394  { "lrcp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = LRCP }, 0, 0, VE, "prog_order" },
395  { "rlcp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = RLCP }, 0, 0, VE, "prog_order" },
396  { "rpcl", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = RPCL }, 0, 0, VE, "prog_order" },
397  { "pcrl", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PCRL }, 0, 0, VE, "prog_order" },
398  { "cprl", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPRL }, 0, 0, VE, "prog_order" },
399  { "numresolution", NULL, OFFSET(numresolution), AV_OPT_TYPE_INT, { .i64 = 6 }, 1, 10, VE },
400  { "numlayers", NULL, OFFSET(numlayers), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 10, VE },
401  { "disto_alloc", NULL, OFFSET(disto_alloc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
402  { "fixed_alloc", NULL, OFFSET(fixed_alloc), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
403  { "fixed_quality", NULL, OFFSET(fixed_quality), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
404  { NULL },
405 };
406 
407 static const AVClass class = {
408  .class_name = "libopenjpeg",
409  .item_name = av_default_item_name,
410  .option = options,
412 };
413 
415  .name = "libopenjpeg",
416  .long_name = NULL_IF_CONFIG_SMALL("OpenJPEG JPEG 2000"),
417  .type = AVMEDIA_TYPE_VIDEO,
418  .id = AV_CODEC_ID_JPEG2000,
419  .priv_data_size = sizeof(LibOpenJPEGContext),
421  .encode2 = libopenjpeg_encode_frame,
423  .capabilities = 0,
424  .pix_fmts = (const enum AVPixelFormat[]) {
435  },
436  .priv_class = &class,
437 };
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:1599
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
AVOption.
Definition: opt.h:234
8bit gray, 8bit alpha
Definition: pixfmt.h:144
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:70
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:129
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:67
AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:2526
#define AV_PIX_FMT_RGBA64
Definition: pixfmt.h:233
AVCodec ff_libopenjpeg_encoder
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1248
AVCodec.
Definition: avcodec.h:2790
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:80
static av_cold int libopenjpeg_encode_close(AVCodecContext *avctx)
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
opj_cparameters_t enc_params
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:38
opj_cinfo_t * compress
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:104
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:97
static opj_image_t * libopenjpeg_create_image(AVCodecContext *avctx, opj_cparameters_t *parameters)
#define av_cold
Definition: attributes.h:66
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:57
static void libopenjpeg_copy_packed16(AVCodecContext *avctx, const AVFrame *frame, opj_image_t *image)
AVOptions.
static void warning_callback(const char *msg, void *data)
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:967
#define AV_PIX_FMT_YUV444P16
Definition: pixfmt.h:248
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1013
uint16_t depth_minus1
Number of bits in the component minus 1.
Definition: pixdesc.h:57
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:89
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:144
#define AV_PIX_FMT_RGB48
Definition: pixfmt.h:229
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
opj_image_t * image
const char * name
Name of the codec implementation.
Definition: avcodec.h:2797
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:245
#define FFMAX(a, b)
Definition: common.h:55
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:96
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:973
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:69
#define AV_PIX_FMT_YUV422P9
Definition: pixfmt.h:241
uint8_t nb_components
The number of components each pixel has, (1-4)
Definition: pixdesc.h:71
#define AV_PIX_FMT_GRAY16
Definition: pixfmt.h:227
#define VE
int width
picture width / height.
Definition: avcodec.h:1218
int ff_alloc_packet(AVPacket *avpkt, int size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1236
static void libopenjpeg_copy_packed8(AVCodecContext *avctx, const AVFrame *frame, opj_image_t *image)
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:242
LIBAVUTIL_VERSION_INT
Definition: eval.c:55
static av_cold int libopenjpeg_encode_init(AVCodecContext *avctx)
#define AV_PIX_FMT_YUV420P16
Definition: pixfmt.h:246
NULL
Definition: eval.c:55
static int width
Definition: utils.c:156
Libavcodec external API header.
int compression_level
Definition: avcodec.h:1130
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
av_default_item_name
Definition: dnxhdenc.c:52
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
main external API structure.
Definition: avcodec.h:1044
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
static void libopenjpeg_copy_unpacked16(AVCodecContext *avctx, const AVFrame *frame, opj_image_t *image)
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:243
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:71
Describe the class of an AVClass context structure.
Definition: log.h:33
opj_event_mgr_t event_mgr
static void libopenjpeg_copy_unpacked8(AVCodecContext *avctx, const AVFrame *frame, opj_image_t *image)
#define AV_PIX_FMT_YUV420P9
Definition: pixfmt.h:240
static void info_callback(const char *msg, void *data)
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:1124
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:244
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
int height
Definition: gxfenc.c:72
static int libopenjpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
Y , 8bpp.
Definition: pixfmt.h:73
common internal api header.
common internal and external API header
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:72
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1086
int len
static const AVOption options[]
static void error_callback(const char *msg, void *data)
#define OFFSET(x)
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:102
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:1540
AVPixelFormat
Pixel format.
Definition: pixfmt.h:63
This structure stores compressed data.
Definition: avcodec.h:944
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:205
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:247
for(j=16;j >0;--j)