FFmpeg
photocd.c
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1 /*
2  * Kodak PhotoCD (a.k.a. ImagePac) image decoder
3  *
4  * Copyright (c) 1996-2002 Gerd Knorr
5  * Copyright (c) 2010 Kenneth Vermeirsch
6  * Copyright (c) 2020 Paul B Mahol
7  *
8  * This file is part of FFmpeg.
9  *
10  * FFmpeg is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * FFmpeg is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with FFmpeg; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
25 /**
26  * @file
27  * Kodak PhotoCD (a.k.a. ImagePac) image decoder
28  *
29  * Supports resolutions up to 3072x2048.
30  */
31 
32 #define CACHED_BITSTREAM_READER !ARCH_X86_32
33 
34 #include "libavutil/intreadwrite.h"
35 #include "libavutil/opt.h"
36 #include "avcodec.h"
37 #include "bytestream.h"
38 #include "codec_internal.h"
39 #include "decode.h"
40 #include "get_bits.h"
41 #include "thread.h"
42 
43 typedef struct PhotoCDContext {
44  AVClass *class;
45  int lowres;
46 
48  int thumbnails; //* number of thumbnails; 0 for normal image */
51 
52  int streampos;
53 
54  uint8_t bits[256];
55  uint16_t codes[256];
56  uint8_t syms[256];
57 
58  VLC vlc[3];
60 
61 typedef struct ImageInfo {
62  uint32_t start;
63  uint16_t width, height;
64 } ImageInfo;
65 
66 static const ImageInfo img_info[6] = {
67  {8192, 192, 128},
68  {47104, 384, 256},
69  {196608, 768, 512},
70  {0, 1536, 1024},
71  {0, 3072, 2048},
72  {0, 6144, 4096},
73 };
74 
76  int width, int height)
77 {
78  GetByteContext *gb = &s->gb;
79  int start = s->streampos + img_info[2].start;
80  uint8_t *ptr, *ptr1, *ptr2;
81  uint8_t *dst;
82  int fill;
83 
84  ptr = picture->data[0];
85  ptr1 = picture->data[1];
86  ptr2 = picture->data[2];
87 
88  bytestream2_seek(gb, start, SEEK_SET);
89 
90  for (int y = 0; y < height; y += 2) {
91  dst = ptr;
92  for (int x = 0; x < width - 1; x++) {
93  fill = bytestream2_get_byte(gb);
94  *(dst++) = fill;
95  *(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
96  }
97  fill = bytestream2_get_byte(gb);
98  *(dst++) = fill;
99  *(dst++) = fill;
100 
101  ptr += picture->linesize[0] << 1;
102 
103  dst = ptr;
104  for (int x = 0; x < width - 1; x++) {
105  fill = bytestream2_get_byte(gb);
106  *(dst++) = fill;
107  *(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
108  }
109  fill = bytestream2_get_byte(gb);
110  *(dst++) = fill;
111  *(dst++) = fill;
112 
113  ptr += picture->linesize[0] << 1;
114 
115  dst = ptr1;
116  for (int x = 0; x < (width >> 1) - 1; x++) {
117  fill = bytestream2_get_byte(gb);
118  *(dst++) = fill;
119  *(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
120  }
121  fill = bytestream2_get_byte(gb);
122  *(dst++) = fill;
123  *(dst++) = fill;
124 
125  ptr1 += picture->linesize[1] << 1;
126 
127  dst = ptr2;
128  for (int x = 0; x < (width >> 1) - 1; x++) {
129  fill = bytestream2_get_byte(gb);
130  *(dst++) = fill;
131  *(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
132  }
133  fill = bytestream2_get_byte(gb);
134  *(dst++) = fill;
135  *(dst++) = fill;
136 
137  ptr2 += picture->linesize[2] << 1;
138  }
139 
140  s->streampos += bytestream2_tell(gb) - start;
141 }
142 
143 static av_noinline void interp_lines(uint8_t *ptr, int linesize,
144  int width, int height)
145 {
146  const uint8_t *src1;
147  uint8_t *dst;
148  int x;
149 
150  for (int y = 0; y < height - 2; y += 2) {
151  const uint8_t *src1 = ptr;
152  uint8_t *dst = ptr + linesize;
153  const uint8_t *src2 = dst + linesize;
154  for (x = 0; x < width - 2; x += 2) {
155  dst[x] = (src1[x] + src2[x] + 1) >> 1;
156  dst[x + 1] = (src1[x] + src2[x] + src1[x + 2] + src2[x + 2] + 2) >> 2;
157  }
158  dst[x] = dst[x + 1] = (src1[x] + src2[x] + 1) >> 1;
159 
160  ptr += linesize << 1;
161  }
162 
163  src1 = ptr;
164  dst = ptr + linesize;
165  for (x = 0; x < width - 2; x += 2) {
166  dst[x] = src1[x];
167  dst[x + 1] = (src1[x] + src1[x + 2] + 1) >> 1;
168  }
169  dst[x] = dst[x + 1] = src1[x];
170 }
171 
172 static av_noinline void interp_pixels(uint8_t *ptr, int linesize,
173  int width, int height)
174 {
175  for (int y = height - 2; y >= 0; y -= 2) {
176  const uint8_t *src = ptr + (y >> 1) * linesize;
177  uint8_t *dst = ptr + y * linesize;
178 
179  dst[width - 2] = dst[width - 1] = src[(width >> 1) - 1];
180  for (int x = width - 4; x >= 0; x -= 2) {
181  dst[x] = src[x >> 1];
182  dst[x + 1] = (src[x >> 1] + src[(x >> 1) + 1] + 1) >> 1;
183  }
184  }
185 }
186 
188 {
189  PhotoCDContext *s = avctx->priv_data;
190  GetByteContext *gb = &s->gb;
191  int start = s->streampos;
192  int count, ret;
193 
194  bytestream2_seek(gb, start, SEEK_SET);
195 
196  count = bytestream2_get_byte(gb) + 1;
197  if (bytestream2_get_bytes_left(gb) < count * 4)
198  return AVERROR_INVALIDDATA;
199 
200  for (int j = 0; j < count; j++) {
201  const int bit = bytestream2_get_byteu(gb) + 1;
202  const int code = bytestream2_get_be16u(gb);
203  const int sym = bytestream2_get_byteu(gb);
204 
205  if (bit > 16)
206  return AVERROR_INVALIDDATA;
207 
208  s->bits[j] = bit;
209  s->codes[j] = code >> (16 - bit);
210  s->syms[j] = sym;
211  }
212 
213  ff_vlc_free(vlc);
214  ret = ff_vlc_init_sparse(vlc, 12, count,
215  s->bits, sizeof(*s->bits), sizeof(*s->bits),
216  s->codes, sizeof(*s->codes), sizeof(*s->codes),
217  s->syms, sizeof(*s->syms), sizeof(*s->syms), 0);
218 
219  s->streampos = bytestream2_tell(gb);
220 
221  return ret;
222 }
223 
225  int target_res, int curr_res)
226 {
227  PhotoCDContext *s = avctx->priv_data;
229  GetByteContext *gb = &s->gb;
230  int ret, y = 0, type, height;
231  int start = s->streampos;
232  unsigned shiftreg;
233  const int scaling = target_res - curr_res;
234  const uint8_t type2idx[] = { 0, 0xff, 1, 2 };
235 
236  bytestream2_seek(gb, start, SEEK_SET);
238  if (ret < 0)
239  return ret;
240 
241  height = img_info[curr_res].height;
242 
243  while (y < height) {
244  uint8_t *data;
245  int x2, idx;
246 
247  for (; get_bits_left(&g) > 0;) {
248  if (show_bits(&g, 12) == 0xfff)
249  break;
250  skip_bits(&g, 8);
251  }
252 
253  shiftreg = show_bits(&g, 24);
254  while (shiftreg != 0xfffffe) {
255  if (get_bits_left(&g) <= 0)
256  return AVERROR_INVALIDDATA;
257  skip_bits(&g, 1);
258  shiftreg = show_bits(&g, 24);
259  }
260  skip_bits(&g, 24);
261  y = show_bits(&g, 15) & 0x1fff;
262  if (y >= height)
263  break;
264  type = get_bits(&g, 2);
265  skip_bits(&g, 14);
266 
267  if (type == 1)
268  return AVERROR_INVALIDDATA;
269  idx = type2idx[type];
270 
271  data = frame->data[idx] + (y >> !!idx) * frame->linesize[idx];
272 
273  x2 = avctx->width >> (scaling + !!idx);
274  for (int x = 0; x < x2; x++) {
275  int m;
276 
277  if (get_bits_left(&g) <= 0)
278  return AVERROR_INVALIDDATA;
279  m = get_vlc2(&g, s->vlc[idx].table, s->vlc[idx].bits, 2);
280  if (m < 0)
281  return AVERROR_INVALIDDATA;
282  m = sign_extend(m, 8);
283  data[x] = av_clip_uint8(data[x] + m);
284  }
285  }
286 
287  s->streampos += (get_bits_count(&g) + 7) >> 3;
288  s->streampos = (s->streampos + 0x6000 + 2047) & ~0x7ff;
289 
290  return 0;
291 }
292 
294  int *got_frame, AVPacket *avpkt)
295 {
296  PhotoCDContext *s = avctx->priv_data;
297  const uint8_t *buf = avpkt->data;
298  GetByteContext *gb = &s->gb;
299  uint8_t *ptr, *ptr1, *ptr2;
300  int ret;
301 
302  if (avpkt->size < img_info[0].start)
303  return AVERROR_INVALIDDATA;
304 
305  if (!memcmp("PCD_OPA", buf, 7)) {
306  s->thumbnails = AV_RL16(buf + 10);
307  av_log(avctx, AV_LOG_WARNING, "this is a thumbnails file, "
308  "reading first thumbnail only\n");
309  } else if (avpkt->size < 786432) {
310  return AVERROR_INVALIDDATA;
311  } else if (memcmp("PCD_IPI", buf + 0x800, 7)) {
312  return AVERROR_INVALIDDATA;
313  }
314 
315  s->orientation = s->thumbnails ? buf[12] & 3 : buf[0x48] & 3;
316 
317  if (s->thumbnails)
318  s->resolution = 0;
319  else if (avpkt->size <= 788480)
320  s->resolution = 2;
321  else
322  s->resolution = av_clip(4 - s->lowres, 0, 4);
323 
324  ret = ff_set_dimensions(avctx, img_info[s->resolution].width, img_info[s->resolution].height);
325  if (ret < 0)
326  return ret;
327 
328  if (avctx->skip_frame >= AVDISCARD_ALL)
329  return avpkt->size;
330 
331  if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
332  return ret;
333 
335  p->flags |= AV_FRAME_FLAG_KEY;
336 
337  bytestream2_init(gb, avpkt->data, avpkt->size);
338 
339  if (s->resolution < 3) {
340  ptr = p->data[0];
341  ptr1 = p->data[1];
342  ptr2 = p->data[2];
343 
344  if (s->thumbnails)
345  bytestream2_seek(gb, 10240, SEEK_SET);
346  else
347  bytestream2_seek(gb, img_info[s->resolution].start, SEEK_SET);
348 
349  for (int y = 0; y < avctx->height; y += 2) {
350  bytestream2_get_buffer(gb, ptr, avctx->width);
351  ptr += p->linesize[0];
352 
353  bytestream2_get_buffer(gb, ptr, avctx->width);
354  ptr += p->linesize[0];
355 
356  bytestream2_get_buffer(gb, ptr1, avctx->width >> 1);
357  ptr1 += p->linesize[1];
358 
359  bytestream2_get_buffer(gb, ptr2, avctx->width >> 1);
360  ptr2 += p->linesize[2];
361  }
362  } else {
363  s->streampos = 0;
364  ptr = p->data[0];
365  ptr1 = p->data[1];
366  ptr2 = p->data[2];
367 
369 
370  interp_lines(ptr1, p->linesize[1], img_info[2].width, img_info[2].height);
371  interp_lines(ptr2, p->linesize[2], img_info[2].width, img_info[2].height);
372 
373  if (s->resolution == 4) {
374  interp_pixels(ptr1, p->linesize[1], img_info[3].width, img_info[3].height);
375  interp_lines (ptr1, p->linesize[1], img_info[3].width, img_info[3].height);
376  interp_pixels(ptr2, p->linesize[2], img_info[3].width, img_info[3].height);
377  interp_lines (ptr2, p->linesize[2], img_info[3].width, img_info[3].height);
378  }
379 
380  interp_lines(ptr, p->linesize[0], img_info[3].width, img_info[3].height);
381 
382  s->streampos = 0xc2000;
383  for (int n = 0; n < 3; n++) {
384  if ((ret = read_hufftable(avctx, &s->vlc[n])) < 0)
385  return ret;
386  }
387  s->streampos = (s->streampos + 2047) & ~0x3ff;
388  if (decode_huff(avctx, p, s->resolution, 3) < 0)
389  return AVERROR_INVALIDDATA;
390 
391  if (s->resolution == 4) {
392  interp_pixels(ptr, p->linesize[0], img_info[4].width, img_info[4].height);
393  interp_lines (ptr, p->linesize[0], img_info[4].width, img_info[4].height);
394 
395  for (int n = 0; n < 3; n++) {
396  if ((ret = read_hufftable(avctx, &s->vlc[n])) < 0)
397  return ret;
398  }
399  s->streampos = (s->streampos + 2047) & ~0x3ff;
400  if (decode_huff(avctx, p, 4, 4) < 0)
401  return AVERROR_INVALIDDATA;
402  }
403  }
404 
405  {
406  ptr1 = p->data[1];
407  ptr2 = p->data[2];
408 
409  for (int y = 0; y < avctx->height >> 1; y++) {
410  for (int x = 0; x < avctx->width >> 1; x++) {
411  ptr1[x] = av_clip_uint8(ptr1[x] - 28);
412  ptr2[x] = av_clip_uint8(ptr2[x] - 9);
413  }
414 
415  ptr1 += p->linesize[1];
416  ptr2 += p->linesize[2];
417  }
418  }
419 
420  *got_frame = 1;
421 
422  return 0;
423 }
424 
426 {
427  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
428  avctx->colorspace = AVCOL_SPC_BT709;
431  avctx->color_range = AVCOL_RANGE_JPEG;
432 
433  return 0;
434 }
435 
437 {
438  PhotoCDContext *s = avctx->priv_data;
439 
440  for (int i = 0; i < 3; i++)
441  ff_vlc_free(&s->vlc[i]);
442 
443  return 0;
444 }
445 
446 #define OFFSET(x) offsetof(PhotoCDContext, x)
447 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
448 
449 static const AVOption options[] = {
450  { "lowres", "Lower the decoding resolution by a power of two",
451  OFFSET(lowres), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 4, VD },
452  { NULL },
453 };
454 
455 static const AVClass photocd_class = {
456  .class_name = "photocd",
457  .item_name = av_default_item_name,
458  .option = options,
459  .version = LIBAVUTIL_VERSION_INT,
460 };
461 
463  .p.name = "photocd",
464  .p.type = AVMEDIA_TYPE_VIDEO,
465  .p.id = AV_CODEC_ID_PHOTOCD,
466  .priv_data_size = sizeof(PhotoCDContext),
467  .p.priv_class = &photocd_class,
468  .init = photocd_decode_init,
469  .close = photocd_decode_close,
471  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
472  .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
473  CODEC_LONG_NAME("Kodak Photo CD"),
474 };
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
av_clip
#define av_clip
Definition: common.h:98
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:694
opt.h
AVCodecContext::colorspace
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:1033
photocd_decode_close
static av_cold int photocd_decode_close(AVCodecContext *avctx)
Definition: photocd.c:436
PhotoCDContext::gb
GetByteContext gb
Definition: photocd.c:47
GetByteContext
Definition: bytestream.h:33
photocd_decode_frame
static int photocd_decode_frame(AVCodecContext *avctx, AVFrame *p, int *got_frame, AVPacket *avpkt)
Definition: photocd.c:293
src1
const pixel * src1
Definition: h264pred_template.c:421
VD
#define VD
Definition: photocd.c:447
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:266
bytestream2_seek
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
Definition: bytestream.h:212
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
AVCodecContext::color_trc
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:1026
AVCOL_RANGE_JPEG
@ AVCOL_RANGE_JPEG
Full range content.
Definition: pixfmt.h:687
AVPacket::data
uint8_t * data
Definition: packet.h:522
AVOption
AVOption.
Definition: opt.h:251
data
const char data[16]
Definition: mxf.c:148
FFCodec
Definition: codec_internal.h:127
AVFrame::flags
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
Definition: frame.h:649
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:94
decode_huff
static av_noinline int decode_huff(AVCodecContext *avctx, AVFrame *frame, int target_res, int curr_res)
Definition: photocd.c:224
thread.h
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:361
ff_thread_get_buffer
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call have so the codec calls ff_thread_report set FF_CODEC_CAP_ALLOCATE_PROGRESS in FFCodec caps_internal and use ff_thread_get_buffer() to allocate frames. Otherwise decode directly into the user-supplied frames. Call ff_thread_report_progress() after some part of the current picture has decoded. A good place to put this is where draw_horiz_band() is called - add this if it isn 't called anywhere
bit
#define bit(string, value)
Definition: cbs_mpeg2.c:56
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:381
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
AVCOL_TRC_IEC61966_2_1
@ AVCOL_TRC_IEC61966_2_1
IEC 61966-2-1 (sRGB or sYCC)
Definition: pixfmt.h:598
AVCodecContext::skip_frame
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:1770
GetBitContext
Definition: get_bits.h:108
ImageInfo::start
uint32_t start
Definition: photocd.c:62
av_noinline
#define av_noinline
Definition: attributes.h:72
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
interp_pixels
static av_noinline void interp_pixels(uint8_t *ptr, int linesize, int width, int height)
Definition: photocd.c:172
OFFSET
#define OFFSET(x)
Definition: photocd.c:446
AVCodecContext::color_primaries
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:1019
interp_lines
static av_noinline void interp_lines(uint8_t *ptr, int linesize, int width, int height)
Definition: photocd.c:143
av_cold
#define av_cold
Definition: attributes.h:90
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:545
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:628
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:306
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
g
const char * g
Definition: vf_curves.c:127
GetByteContext::buffer
const uint8_t * buffer
Definition: bytestream.h:34
decode.h
get_bits.h
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:94
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:73
PhotoCDContext::codes
uint16_t codes[256]
Definition: photocd.c:55
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:272
frame
static AVFrame * frame
Definition: demux_decode.c:54
PhotoCDContext::vlc
VLC vlc[3]
Definition: photocd.c:58
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:110
AVDISCARD_ALL
@ AVDISCARD_ALL
discard all
Definition: defs.h:219
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1043
read_hufftable
static av_noinline int read_hufftable(AVCodecContext *avctx, VLC *vlc)
Definition: photocd.c:187
AVCOL_PRI_BT709
@ AVCOL_PRI_BT709
also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP 177 Annex B
Definition: pixfmt.h:561
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
interp_lowres
static av_noinline void interp_lowres(PhotoCDContext *s, AVFrame *picture, int width, int height)
Definition: photocd.c:75
bytestream2_get_buffer
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:267
lowres
static int lowres
Definition: ffplay.c:333
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, const VLCElem *table, int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:652
img_info
static const ImageInfo img_info[6]
Definition: photocd.c:66
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
bytestream2_tell
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:192
AV_CODEC_ID_PHOTOCD
@ AV_CODEC_ID_PHOTOCD
Definition: codec_id.h:308
PhotoCDContext::lowres
int lowres
Definition: photocd.c:45
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:442
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:523
codec_internal.h
photocd_class
static const AVClass photocd_class
Definition: photocd.c:455
FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM
The decoder extracts and fills its parameters even if the frame is skipped due to the skip_frame sett...
Definition: codec_internal.h:54
height
#define height
ImageInfo::height
uint16_t height
Definition: photocd.c:63
PhotoCDContext::resolution
int resolution
Definition: photocd.c:49
ff_vlc_init_sparse
int ff_vlc_init_sparse(VLC *vlc, int nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size, const void *codes, int codes_wrap, int codes_size, const void *symbols, int symbols_wrap, int symbols_size, int flags)
Build VLC decoding tables suitable for use with get_vlc2().
Definition: vlc.c:250
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:245
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:371
PhotoCDContext::streampos
int streampos
Definition: photocd.c:52
src2
const pixel * src2
Definition: h264pred_template.c:422
PhotoCDContext
Definition: photocd.c:43
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::height
int height
Definition: avcodec.h:625
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:662
avcodec.h
ff_vlc_free
void ff_vlc_free(VLC *vlc)
Definition: vlc.c:577
ret
ret
Definition: filter_design.txt:187
AVClass::class_name
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:71
PhotoCDContext::bits
uint8_t bits[256]
Definition: photocd.c:54
options
static const AVOption options[]
Definition: photocd.c:449
AVCodecContext
main external API structure.
Definition: avcodec.h:445
PhotoCDContext::orientation
int orientation
Definition: photocd.c:50
PhotoCDContext::thumbnails
int thumbnails
Definition: photocd.c:48
VLC
Definition: vlc.h:36
photocd_decode_init
static av_cold int photocd_decode_init(AVCodecContext *avctx)
Definition: photocd.c:425
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
sign_extend
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:133
av_clip_uint8
#define av_clip_uint8
Definition: common.h:104
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPacket
This structure stores compressed data.
Definition: packet.h:499
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
ff_photocd_decoder
const FFCodec ff_photocd_decoder
Definition: photocd.c:462
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:625
bytestream.h
PhotoCDContext::syms
uint8_t syms[256]
Definition: photocd.c:56
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:385
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
AVCOL_SPC_BT709
@ AVCOL_SPC_BT709
also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / derived in SMPTE RP 177 Annex B
Definition: pixfmt.h:615
ImageInfo
Definition: photocd.c:61
ImageInfo::width
uint16_t width
Definition: photocd.c:63