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mjpegenc.c
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1 /*
2  * MJPEG encoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2003 Alex Beregszaszi
5  * Copyright (c) 2003-2004 Michael Niedermayer
6  *
7  * Support for external huffman table, various fixes (AVID workaround),
8  * aspecting, new decode_frame mechanism and apple mjpeg-b support
9  * by Alex Beregszaszi
10  *
11  * This file is part of FFmpeg.
12  *
13  * FFmpeg is free software; you can redistribute it and/or
14  * modify it under the terms of the GNU Lesser General Public
15  * License as published by the Free Software Foundation; either
16  * version 2.1 of the License, or (at your option) any later version.
17  *
18  * FFmpeg is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21  * Lesser General Public License for more details.
22  *
23  * You should have received a copy of the GNU Lesser General Public
24  * License along with FFmpeg; if not, write to the Free Software
25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26  */
27 
28 /**
29  * @file
30  * MJPEG encoder.
31  */
32 
33 #include "libavutil/pixdesc.h"
34 
35 #include "avcodec.h"
36 #include "jpegtables.h"
37 #include "mjpegenc_common.h"
38 #include "mpegvideo.h"
39 #include "mjpeg.h"
40 #include "mjpegenc.h"
41 
43 {
44  MJpegContext *m = s->mjpeg_ctx;
45  size_t num_mbs, num_blocks, num_codes;
46  int blocks_per_mb;
47 
48  // We need to init this here as the mjpeg init is called before the common init,
49  s->mb_width = (s->width + 15) / 16;
50  s->mb_height = (s->height + 15) / 16;
51 
52  switch (s->chroma_format) {
53  case CHROMA_420: blocks_per_mb = 6; break;
54  case CHROMA_422: blocks_per_mb = 8; break;
55  case CHROMA_444: blocks_per_mb = 12; break;
56  default: av_assert0(0);
57  };
58 
59  // Make sure we have enough space to hold this frame.
60  num_mbs = s->mb_width * s->mb_height;
61  num_blocks = num_mbs * blocks_per_mb;
62  num_codes = num_blocks * 64;
63 
64  m->huff_buffer = av_malloc_array(num_codes, sizeof(MJpegHuffmanCode));
65  if (!m->huff_buffer)
66  return AVERROR(ENOMEM);
67  return 0;
68 }
69 
71 {
72  MJpegContext *m;
73 
75 
76  if (s->width > 65500 || s->height > 65500) {
77  av_log(s, AV_LOG_ERROR, "JPEG does not support resolutions above 65500x65500\n");
78  return AVERROR(EINVAL);
79  }
80 
81  m = av_mallocz(sizeof(MJpegContext));
82  if (!m)
83  return AVERROR(ENOMEM);
84 
85  s->min_qcoeff=-1023;
86  s->max_qcoeff= 1023;
87 
88  // Build default Huffman tables.
89  // These may be overwritten later with more optimal Huffman tables, but
90  // they are needed at least right now for some processes like trellis.
107 
114 
115  // Buffers start out empty.
116  m->huff_ncode = 0;
117  s->mjpeg_ctx = m;
118 
120  return alloc_huffman(s);
121 
122  return 0;
123 }
124 
126 {
128  av_freep(&s->mjpeg_ctx);
129 }
130 
131 /**
132  * Add code and table_id to the JPEG buffer.
133  *
134  * @param s The MJpegContext which contains the JPEG buffer.
135  * @param table_id Which Huffman table the code belongs to.
136  * @param code The encoded exponent of the coefficients and the run-bits.
137  */
138 static inline void ff_mjpeg_encode_code(MJpegContext *s, uint8_t table_id, int code)
139 {
141  c->table_id = table_id;
142  c->code = code;
143 }
144 
145 /**
146  * Add the coefficient's data to the JPEG buffer.
147  *
148  * @param s The MJpegContext which contains the JPEG buffer.
149  * @param table_id Which Huffman table the code belongs to.
150  * @param val The coefficient.
151  * @param run The run-bits.
152  */
153 static void ff_mjpeg_encode_coef(MJpegContext *s, uint8_t table_id, int val, int run)
154 {
155  int mant, code;
156 
157  if (val == 0) {
158  av_assert0(run == 0);
159  ff_mjpeg_encode_code(s, table_id, 0);
160  } else {
161  mant = val;
162  if (val < 0) {
163  val = -val;
164  mant--;
165  }
166 
167  code = (run << 4) | (av_log2_16bit(val) + 1);
168 
169  s->huff_buffer[s->huff_ncode].mant = mant;
170  ff_mjpeg_encode_code(s, table_id, code);
171  }
172 }
173 
174 /**
175  * Add the block's data into the JPEG buffer.
176  *
177  * @param s The MJpegEncContext that contains the JPEG buffer.
178  * @param block The block.
179  * @param n The block's index or number.
180  */
181 static void record_block(MpegEncContext *s, int16_t *block, int n)
182 {
183  int i, j, table_id;
184  int component, dc, last_index, val, run;
185  MJpegContext *m = s->mjpeg_ctx;
186 
187  /* DC coef */
188  component = (n <= 3 ? 0 : (n&1) + 1);
189  table_id = (n <= 3 ? 0 : 1);
190  dc = block[0]; /* overflow is impossible */
191  val = dc - s->last_dc[component];
192 
193  ff_mjpeg_encode_coef(m, table_id, val, 0);
194 
195  s->last_dc[component] = dc;
196 
197  /* AC coefs */
198 
199  run = 0;
200  last_index = s->block_last_index[n];
201  table_id |= 2;
202 
203  for(i=1;i<=last_index;i++) {
204  j = s->intra_scantable.permutated[i];
205  val = block[j];
206 
207  if (val == 0) {
208  run++;
209  } else {
210  while (run >= 16) {
211  ff_mjpeg_encode_code(m, table_id, 0xf0);
212  run -= 16;
213  }
214  ff_mjpeg_encode_coef(m, table_id, val, run);
215  run = 0;
216  }
217  }
218 
219  /* output EOB only if not already 64 values */
220  if (last_index < 63 || run != 0)
221  ff_mjpeg_encode_code(m, table_id, 0);
222 }
223 
224 static void encode_block(MpegEncContext *s, int16_t *block, int n)
225 {
226  int mant, nbits, code, i, j;
227  int component, dc, run, last_index, val;
228  MJpegContext *m = s->mjpeg_ctx;
229  uint8_t *huff_size_ac;
230  uint16_t *huff_code_ac;
231 
232  /* DC coef */
233  component = (n <= 3 ? 0 : (n&1) + 1);
234  dc = block[0]; /* overflow is impossible */
235  val = dc - s->last_dc[component];
236  if (n < 4) {
238  huff_size_ac = m->huff_size_ac_luminance;
239  huff_code_ac = m->huff_code_ac_luminance;
240  } else {
242  huff_size_ac = m->huff_size_ac_chrominance;
243  huff_code_ac = m->huff_code_ac_chrominance;
244  }
245  s->last_dc[component] = dc;
246 
247  /* AC coefs */
248 
249  run = 0;
250  last_index = s->block_last_index[n];
251  for(i=1;i<=last_index;i++) {
252  j = s->intra_scantable.permutated[i];
253  val = block[j];
254  if (val == 0) {
255  run++;
256  } else {
257  while (run >= 16) {
258  put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
259  run -= 16;
260  }
261  mant = val;
262  if (val < 0) {
263  val = -val;
264  mant--;
265  }
266 
267  nbits= av_log2_16bit(val) + 1;
268  code = (run << 4) | nbits;
269 
270  put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
271 
272  put_sbits(&s->pb, nbits, mant);
273  run = 0;
274  }
275  }
276 
277  /* output EOB only if not already 64 values */
278  if (last_index < 63 || run != 0)
279  put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
280 }
281 
282 void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[12][64])
283 {
284  int i;
285  if (s->huffman == HUFFMAN_TABLE_OPTIMAL) {
286  if (s->chroma_format == CHROMA_444) {
287  record_block(s, block[0], 0);
288  record_block(s, block[2], 2);
289  record_block(s, block[4], 4);
290  record_block(s, block[8], 8);
291  record_block(s, block[5], 5);
292  record_block(s, block[9], 9);
293 
294  if (16*s->mb_x+8 < s->width) {
295  record_block(s, block[1], 1);
296  record_block(s, block[3], 3);
297  record_block(s, block[6], 6);
298  record_block(s, block[10], 10);
299  record_block(s, block[7], 7);
300  record_block(s, block[11], 11);
301  }
302  } else {
303  for(i=0;i<5;i++) {
304  record_block(s, block[i], i);
305  }
306  if (s->chroma_format == CHROMA_420) {
307  record_block(s, block[5], 5);
308  } else {
309  record_block(s, block[6], 6);
310  record_block(s, block[5], 5);
311  record_block(s, block[7], 7);
312  }
313  }
314  } else {
315  if (s->chroma_format == CHROMA_444) {
316  encode_block(s, block[0], 0);
317  encode_block(s, block[2], 2);
318  encode_block(s, block[4], 4);
319  encode_block(s, block[8], 8);
320  encode_block(s, block[5], 5);
321  encode_block(s, block[9], 9);
322 
323  if (16*s->mb_x+8 < s->width) {
324  encode_block(s, block[1], 1);
325  encode_block(s, block[3], 3);
326  encode_block(s, block[6], 6);
327  encode_block(s, block[10], 10);
328  encode_block(s, block[7], 7);
329  encode_block(s, block[11], 11);
330  }
331  } else {
332  for(i=0;i<5;i++) {
333  encode_block(s, block[i], i);
334  }
335  if (s->chroma_format == CHROMA_420) {
336  encode_block(s, block[5], 5);
337  } else {
338  encode_block(s, block[6], 6);
339  encode_block(s, block[5], 5);
340  encode_block(s, block[7], 7);
341  }
342  }
343 
344  s->i_tex_bits += get_bits_diff(s);
345  }
346 }
347 
348 #if CONFIG_AMV_ENCODER
349 // maximum over s->mjpeg_vsample[i]
350 #define V_MAX 2
351 static int amv_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
352  const AVFrame *pic_arg, int *got_packet)
353 {
354  MpegEncContext *s = avctx->priv_data;
355  AVFrame *pic;
356  int i, ret;
357  int chroma_h_shift, chroma_v_shift;
358 
359  av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, &chroma_v_shift);
360 
361 #if FF_API_EMU_EDGE
362  //CODEC_FLAG_EMU_EDGE have to be cleared
364  return AVERROR(EINVAL);
365 #endif
366 
367  if ((avctx->height & 15) && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
368  av_log(avctx, AV_LOG_ERROR,
369  "Heights which are not a multiple of 16 might fail with some decoders, "
370  "use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->height);
371  av_log(avctx, AV_LOG_WARNING, "If you have a device that plays AMV videos, please test if videos "
372  "with such heights work with it and report your findings to ffmpeg-devel@ffmpeg.org\n");
373  return AVERROR_EXPERIMENTAL;
374  }
375 
376  pic = av_frame_clone(pic_arg);
377  if (!pic)
378  return AVERROR(ENOMEM);
379  //picture should be flipped upside-down
380  for(i=0; i < 3; i++) {
381  int vsample = i ? 2 >> chroma_v_shift : 2;
382  pic->data[i] += pic->linesize[i] * (vsample * s->height / V_MAX - 1);
383  pic->linesize[i] *= -1;
384  }
385  ret = ff_mpv_encode_picture(avctx, pkt, pic, got_packet);
386  av_frame_free(&pic);
387  return ret;
388 }
389 #endif
390 
391 #define OFFSET(x) offsetof(MpegEncContext, x)
392 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
393 static const AVOption options[] = {
395 { "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 3, VE, "pred" },
396  { "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
397  { "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
398  { "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 3 }, INT_MIN, INT_MAX, VE, "pred" },
399 { "huffman", "Huffman table strategy", OFFSET(huffman), AV_OPT_TYPE_INT, { .i64 = HUFFMAN_TABLE_OPTIMAL }, 0, NB_HUFFMAN_TABLE_OPTION - 1, VE, "huffman" },
400  { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_DEFAULT }, INT_MIN, INT_MAX, VE, "huffman" },
401  { "optimal", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_OPTIMAL }, INT_MIN, INT_MAX, VE, "huffman" },
402 { NULL},
403 };
404 
405 #if CONFIG_MJPEG_ENCODER
406 static const AVClass mjpeg_class = {
407  .class_name = "mjpeg encoder",
408  .item_name = av_default_item_name,
409  .option = options,
410  .version = LIBAVUTIL_VERSION_INT,
411 };
412 
413 AVCodec ff_mjpeg_encoder = {
414  .name = "mjpeg",
415  .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
416  .type = AVMEDIA_TYPE_VIDEO,
417  .id = AV_CODEC_ID_MJPEG,
418  .priv_data_size = sizeof(MpegEncContext),
420  .encode2 = ff_mpv_encode_picture,
421  .close = ff_mpv_encode_end,
423  .pix_fmts = (const enum AVPixelFormat[]) {
425  },
426  .priv_class = &mjpeg_class,
427 };
428 #endif
429 
430 #if CONFIG_AMV_ENCODER
431 static const AVClass amv_class = {
432  .class_name = "amv encoder",
433  .item_name = av_default_item_name,
434  .option = options,
435  .version = LIBAVUTIL_VERSION_INT,
436 };
437 
438 AVCodec ff_amv_encoder = {
439  .name = "amv",
440  .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
441  .type = AVMEDIA_TYPE_VIDEO,
442  .id = AV_CODEC_ID_AMV,
443  .priv_data_size = sizeof(MpegEncContext),
445  .encode2 = amv_encode_picture,
446  .close = ff_mpv_encode_end,
447  .pix_fmts = (const enum AVPixelFormat[]) {
449  },
450  .priv_class = &amv_class,
451 };
452 #endif
#define NULL
Definition: coverity.c:32
const char const char void * val
Definition: avisynth_c.h:771
const char * s
Definition: avisynth_c.h:768
Holds JPEG frame data and Huffman table data.
Definition: mjpegenc.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
AVOption.
Definition: opt.h:246
static void ff_mjpeg_encode_coef(MJpegContext *s, uint8_t table_id, int val, int run)
Add the coefficient's data to the JPEG buffer.
Definition: mjpegenc.c:153
static void put_sbits(PutBitContext *pb, int n, int32_t value)
Definition: put_bits.h:240
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:206
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:86
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
MJPEG encoder.
#define FF_MPV_COMMON_OPTS
Definition: mpegvideo.h:605
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1974
int min_qcoeff
minimum encodable coefficient
Definition: mpegvideo.h:308
mpegvideo header.
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:222
av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
Definition: mjpegenc.c:70
uint8_t permutated[64]
Definition: idctdsp.h:33
uint8_t run
Definition: svq3.c:206
static AVPacket pkt
uint8_t * intra_ac_vlc_length
Definition: mpegvideo.h:311
int av_log2_16bit(unsigned v)
Definition: intmath.c:31
AVCodec.
Definition: avcodec.h:3722
av_cold void ff_init_uni_ac_vlc(const uint8_t huff_size_ac[256], uint8_t *uni_ac_vlc_len)
MJPEG encoder and decoder.
uint16_t huff_code_dc_chrominance[12]
DC chrominance Huffman table codes.
Definition: mjpegenc.h:64
#define AV_CODEC_CAP_INTRA_ONLY
Codec is intra only.
Definition: avcodec.h:1094
static int16_t block[64]
Definition: dct.c:115
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:72
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code, const uint8_t *bits_table, const uint8_t *val_table)
Definition: jpegtables.c:127
uint16_t huff_code_ac_luminance[256]
AC luminance Huffman table codes.
Definition: mjpegenc.h:67
uint8_t
#define av_cold
Definition: attributes.h:82
static void encode_block(MpegEncContext *s, int16_t *block, int n)
Definition: mjpegenc.c:224
uint8_t uni_chroma_ac_vlc_len[64 *64 *2]
Storage for AC chrominance VLC (in MpegEncContext)
Definition: mjpegenc.h:74
const uint8_t avpriv_mjpeg_bits_dc_luminance[17]
Definition: jpegtables.c:65
#define CHROMA_420
Definition: mpegvideo.h:473
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
Definition: pixfmt.h:75
uint8_t huff_size_dc_chrominance[12]
DC chrominance Huffman table size.
Definition: mjpegenc.h:63
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:126
Use the default Huffman tables.
Definition: mjpegenc.h:96
int max_qcoeff
maximum encodable coefficient
Definition: mpegvideo.h:309
#define CHROMA_444
Definition: mpegvideo.h:475
#define av_log(a,...)
#define FF_COMPLIANCE_UNOFFICIAL
Allow unofficial extensions.
Definition: avcodec.h:2969
uint8_t table_id
The Huffman table id associated with the data.
Definition: mjpegenc.h:51
static int get_bits_diff(MpegEncContext *s)
Definition: mpegvideo.h:745
uint16_t huff_code_ac_chrominance[256]
AC chrominance Huffman table codes.
Definition: mjpegenc.h:69
int slice_context_count
number of used thread_contexts
Definition: mpegvideo.h:153
uint8_t huff_size_ac_luminance[256]
AC luminance Huffman table size.
Definition: mjpegenc.h:66
uint16_t mant
The mantissa.
Definition: mjpegenc.h:53
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:182
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
const uint8_t avpriv_mjpeg_bits_dc_chrominance[17]
Definition: jpegtables.c:70
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:163
int av_pix_fmt_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor.
Definition: pixdesc.c:2443
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:179
static void record_block(MpegEncContext *s, int16_t *block, int n)
Add the block's data into the JPEG buffer.
Definition: mjpegenc.c:181
uint8_t * intra_chroma_ac_vlc_length
Definition: mpegvideo.h:313
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1841
uint8_t huff_size_ac_chrominance[256]
AC chrominance Huffman table size.
Definition: mjpegenc.h:68
const char * name
Name of the codec implementation.
Definition: avcodec.h:3729
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1064
uint8_t * intra_ac_vlc_last_length
Definition: mpegvideo.h:312
#define CHROMA_422
Definition: mpegvideo.h:474
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:74
uint8_t uni_ac_vlc_len[64 *64 *2]
Storage for AC luminance VLC (in MpegEncContext)
Definition: mjpegenc.h:72
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:83
int n
Definition: avisynth_c.h:684
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:489
#define AVERROR_EXPERIMENTAL
Requested feature is flagged experimental. Set strict_std_compliance if you really want to use it...
Definition: error.h:72
Compute and use optimal Huffman tables.
Definition: mjpegenc.h:97
static const float pred[4]
Definition: siprdata.h:259
struct MJpegContext * mjpeg_ctx
Definition: mpegvideo.h:422
#define AV_CODEC_CAP_SLICE_THREADS
Codec supports slice-based (or partition-based) multithreading.
Definition: avcodec.h:1068
#define OFFSET(x)
Definition: mjpegenc.c:391
static void ff_mjpeg_encode_code(MJpegContext *s, uint8_t table_id, int code)
Add code and table_id to the JPEG buffer.
Definition: mjpegenc.c:138
Buffer of JPEG frame data.
Definition: mjpegenc.h:49
void ff_mjpeg_encode_dc(PutBitContext *pb, int val, uint8_t *huff_size, uint16_t *huff_code)
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
static int alloc_huffman(MpegEncContext *s)
Definition: mjpegenc.c:42
uint8_t * intra_chroma_ac_vlc_last_length
Definition: mpegvideo.h:314
main external API structure.
Definition: avcodec.h:1746
ScanTable intra_scantable
Definition: mpegvideo.h:88
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
int ff_mpv_encode_init(AVCodecContext *avctx)
#define VE
Definition: mjpegenc.c:392
const uint8_t avpriv_mjpeg_val_dc[12]
Definition: jpegtables.c:67
Describe the class of an AVClass context structure.
Definition: log.h:67
av_cold void ff_mjpeg_encode_close(MpegEncContext *s)
Definition: mjpegenc.c:125
const uint8_t avpriv_mjpeg_bits_ac_chrominance[17]
Definition: jpegtables.c:99
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:266
const uint8_t avpriv_mjpeg_val_ac_chrominance[]
Definition: jpegtables.c:102
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
MpegEncContext.
Definition: mpegvideo.h:78
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
uint16_t huff_code_dc_luminance[12]
DC luminance Huffman table codes.
Definition: mjpegenc.h:62
PutBitContext pb
bit output
Definition: mpegvideo.h:148
uint8_t huff_size_dc_luminance[12]
DC luminance Huffman table size.
Definition: mjpegenc.h:61
#define CODEC_FLAG_EMU_EDGE
Definition: avcodec.h:1139
uint8_t code
The exponent.
Definition: mjpegenc.h:52
static double c[64]
size_t huff_ncode
Number of current entries in the buffer.
Definition: mjpegenc.h:88
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
Definition: pixfmt.h:76
int ff_mpv_encode_end(AVCodecContext *avctx)
const uint8_t avpriv_mjpeg_bits_ac_luminance[17]
Definition: jpegtables.c:73
void * priv_data
Definition: avcodec.h:1788
const uint8_t avpriv_mjpeg_val_ac_luminance[]
Definition: jpegtables.c:75
void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mjpegenc.c:282
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
#define av_freep(p)
#define av_malloc_array(a, b)
MJpegHuffmanCode * huff_buffer
Buffer for Huffman code values.
Definition: mjpegenc.h:89
int ff_mpv_encode_picture(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1648
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:2965
static const AVOption options[]
Definition: mjpegenc.c:393