FFmpeg: libavcodec/cdgraphics.c Source File

FFmpeg
cdgraphics.c
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1 /*
2  * CD Graphics Video Decoder
3  * Copyright (c) 2009 Michael Tison
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 "bytestream.h"
24 #include "internal.h"
25 
26 /**
27  * @file
28  * @brief CD Graphics Video Decoder
29  * @author Michael Tison
30  * @see http://wiki.multimedia.cx/index.php?title=CD_Graphics
31  * @see http://www.ccs.neu.edu/home/bchafy/cdb/info/cdg
32  */
33 
34 /// default screen sizes
35  #define CDG_FULL_WIDTH 300
36  #define CDG_FULL_HEIGHT 216
37  #define CDG_DISPLAY_WIDTH 294
38  #define CDG_DISPLAY_HEIGHT 204
39  #define CDG_BORDER_WIDTH 6
40  #define CDG_BORDER_HEIGHT 12
41 
42 /// masks
43  #define CDG_COMMAND 0x09
44  #define CDG_MASK 0x3F
45 
46 /// instruction codes
47  #define CDG_INST_MEMORY_PRESET 1
48  #define CDG_INST_BORDER_PRESET 2
49  #define CDG_INST_TILE_BLOCK 6
50  #define CDG_INST_SCROLL_PRESET 20
51  #define CDG_INST_SCROLL_COPY 24
52  #define CDG_INST_TRANSPARENT_COL 28
53  #define CDG_INST_LOAD_PAL_LO 30
54  #define CDG_INST_LOAD_PAL_HIGH 31
55  #define CDG_INST_TILE_BLOCK_XOR 38
56 
57 /// data sizes
58  #define CDG_PACKET_SIZE 24
59  #define CDG_DATA_SIZE 16
60  #define CDG_TILE_HEIGHT 12
61  #define CDG_TILE_WIDTH 6
62  #define CDG_MINIMUM_PKT_SIZE 6
63  #define CDG_MINIMUM_SCROLL_SIZE 3
64  #define CDG_HEADER_SIZE 8
65  #define CDG_PALETTE_SIZE 16
66 
67  typedef struct CDGraphicsContext {
68   AVFrame *frame;
69   int hscroll;
70   int vscroll;
71   int transparency;
72 } CDGraphicsContext;
73 
74  static av_cold int cdg_decode_init(AVCodecContext *avctx)
75 {
76  CDGraphicsContext *cc = avctx->priv_data;
77 
78  cc->frame = av_frame_alloc();
79  if (!cc->frame)
80  return AVERROR(ENOMEM);
81  cc->transparency = -1;
82 
83  avctx->width = CDG_FULL_WIDTH;
84  avctx->height = CDG_FULL_HEIGHT;
85  avctx->pix_fmt = AV_PIX_FMT_PAL8;
86 
87  return 0;
88 }
89 
90  static void cdg_border_preset(CDGraphicsContext *cc, uint8_t *data)
91 {
92  int y;
93  int lsize = cc->frame->linesize[0];
94  uint8_t *buf = cc->frame->data[0];
95  int color = data[0] & 0x0F;
96 
97  if (!(data[1] & 0x0F)) {
98  /// fill the top and bottom borders
99  memset(buf, color, CDG_BORDER_HEIGHT * lsize);
100  memset(buf + (CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT) * lsize,
101  color, CDG_BORDER_HEIGHT * lsize);
102 
103  /// fill the side borders
104  for (y = CDG_BORDER_HEIGHT; y < CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT; y++) {
105  memset(buf + y * lsize, color, CDG_BORDER_WIDTH);
106  memset(buf + CDG_FULL_WIDTH - CDG_BORDER_WIDTH + y * lsize,
107  color, CDG_BORDER_WIDTH);
108  }
109  }
110 }
111 
112  static void cdg_load_palette(CDGraphicsContext *cc, uint8_t *data, int low)
113 {
114  uint8_t r, g, b;
115  uint16_t color;
116  int i;
117  int array_offset = low ? 0 : 8;
118  uint32_t *palette = (uint32_t *) cc->frame->data[1];
119 
120  for (i = 0; i < 8; i++) {
121  color = (data[2 * i] << 6) + (data[2 * i + 1] & 0x3F);
122  r = ((color >> 8) & 0x000F) * 17;
123  g = ((color >> 4) & 0x000F) * 17;
124  b = ((color ) & 0x000F) * 17;
125  palette[i + array_offset] = 0xFFU << 24 | r << 16 | g << 8 | b;
126  if (cc->transparency >= 0)
127  palette[cc->transparency] &= 0xFFFFFF;
128  }
129  cc->frame->palette_has_changed = 1;
130 }
131 
132  static int cdg_tile_block(CDGraphicsContext *cc, uint8_t *data, int b)
133 {
134  unsigned ci, ri;
135  int color;
136  int x, y;
137  int ai;
138  int stride = cc->frame->linesize[0];
139  uint8_t *buf = cc->frame->data[0];
140 
141  ri = (data[2] & 0x1F) * CDG_TILE_HEIGHT + cc->vscroll;
142  ci = (data[3] & 0x3F) * CDG_TILE_WIDTH + cc->hscroll;
143 
144  if (ri > (CDG_FULL_HEIGHT - CDG_TILE_HEIGHT))
145  return AVERROR(EINVAL);
146  if (ci > (CDG_FULL_WIDTH - CDG_TILE_WIDTH))
147  return AVERROR(EINVAL);
148 
149  for (y = 0; y < CDG_TILE_HEIGHT; y++) {
150  for (x = 0; x < CDG_TILE_WIDTH; x++) {
151  if (!((data[4 + y] >> (5 - x)) & 0x01))
152  color = data[0] & 0x0F;
153  else
154  color = data[1] & 0x0F;
155 
156  ai = ci + x + (stride * (ri + y));
157  if (b)
158  color ^= buf[ai];
159  buf[ai] = color;
160  }
161  }
162 
163  return 0;
164 }
165 
166  #define UP 2
167  #define DOWN 1
168  #define LEFT 2
169  #define RIGHT 1
170 
171  static void cdg_copy_rect_buf(int out_tl_x, int out_tl_y, uint8_t *out,
172  int in_tl_x, int in_tl_y, uint8_t *in,
173  int w, int h, int stride)
174 {
175  int y;
176 
177  in += in_tl_x + in_tl_y * stride;
178  out += out_tl_x + out_tl_y * stride;
179  for (y = 0; y < h; y++)
180  memcpy(out + y * stride, in + y * stride, w);
181 }
182 
183  static void cdg_fill_rect_preset(int tl_x, int tl_y, uint8_t *out,
184  int color, int w, int h, int stride)
185 {
186  int y;
187 
188  for (y = tl_y; y < tl_y + h; y++)
189  memset(out + tl_x + y * stride, color, w);
190 }
191 
192  static void cdg_fill_wrapper(int out_tl_x, int out_tl_y, uint8_t *out,
193  int in_tl_x, int in_tl_y, uint8_t *in,
194  int color, int w, int h, int stride, int roll)
195 {
196  if (roll) {
197  cdg_copy_rect_buf(out_tl_x, out_tl_y, out, in_tl_x, in_tl_y,
198  in, w, h, stride);
199  } else {
200  cdg_fill_rect_preset(out_tl_x, out_tl_y, out, color, w, h, stride);
201  }
202 }
203 
204  static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data,
205  AVFrame *new_frame, int roll_over)
206 {
207  int color;
208  int hscmd, h_off, hinc, vscmd, v_off, vinc;
209  int y;
210  int stride = cc->frame->linesize[0];
211  uint8_t *in = cc->frame->data[0];
212  uint8_t *out = new_frame->data[0];
213 
214  color = data[0] & 0x0F;
215  hscmd = (data[1] & 0x30) >> 4;
216  vscmd = (data[2] & 0x30) >> 4;
217 
218  h_off = FFMIN(data[1] & 0x07, CDG_BORDER_WIDTH - 1);
219  v_off = FFMIN(data[2] & 0x0F, CDG_BORDER_HEIGHT - 1);
220 
221  /// find the difference and save the offset for cdg_tile_block usage
222  hinc = h_off - cc->hscroll;
223  vinc = v_off - cc->vscroll;
224  cc->hscroll = h_off;
225  cc->vscroll = v_off;
226 
227  if (vscmd == UP)
228  vinc -= 12;
229  if (vscmd == DOWN)
230  vinc += 12;
231  if (hscmd == LEFT)
232  hinc -= 6;
233  if (hscmd == RIGHT)
234  hinc += 6;
235 
236  if (!hinc && !vinc)
237  return;
238 
239  memcpy(new_frame->data[1], cc->frame->data[1], CDG_PALETTE_SIZE * 4);
240 
241  for (y = FFMAX(0, vinc); y < FFMIN(CDG_FULL_HEIGHT + vinc, CDG_FULL_HEIGHT); y++)
242  memcpy(out + FFMAX(0, hinc) + stride * y,
243  in + FFMAX(0, hinc) - hinc + (y - vinc) * stride,
244  FFMIN(stride + hinc, stride));
245 
246  if (vinc > 0)
247  cdg_fill_wrapper(0, 0, out,
248  0, CDG_FULL_HEIGHT - vinc, in, color,
249  stride, vinc, stride, roll_over);
250  else if (vinc < 0)
251  cdg_fill_wrapper(0, CDG_FULL_HEIGHT + vinc, out,
252  0, 0, in, color,
253  stride, -1 * vinc, stride, roll_over);
254 
255  if (hinc > 0)
256  cdg_fill_wrapper(0, 0, out,
257  CDG_FULL_WIDTH - hinc, 0, in, color,
258  hinc, CDG_FULL_HEIGHT, stride, roll_over);
259  else if (hinc < 0)
260  cdg_fill_wrapper(CDG_FULL_WIDTH + hinc, 0, out,
261  0, 0, in, color,
262  -1 * hinc, CDG_FULL_HEIGHT, stride, roll_over);
263 
264 }
265 
266  static int cdg_decode_frame(AVCodecContext *avctx,
267  void *data, int *got_frame, AVPacket *avpkt)
268 {
269  GetByteContext gb;
270  int buf_size = avpkt->size;
271  int ret;
272  uint8_t command, inst;
273  uint8_t cdg_data[CDG_DATA_SIZE] = {0};
274  AVFrame *frame = data;
275  CDGraphicsContext *cc = avctx->priv_data;
276 
277  if (buf_size < CDG_MINIMUM_PKT_SIZE) {
278  av_log(avctx, AV_LOG_ERROR, "buffer too small for decoder\n");
279  return AVERROR(EINVAL);
280  }
281  if (buf_size > CDG_HEADER_SIZE + CDG_DATA_SIZE) {
282  av_log(avctx, AV_LOG_ERROR, "buffer too big for decoder\n");
283  return AVERROR(EINVAL);
284  }
285 
286  bytestream2_init(&gb, avpkt->data, avpkt->size);
287 
288  if ((ret = ff_reget_buffer(avctx, cc->frame)) < 0)
289  return ret;
290  if (!avctx->frame_number) {
291  memset(cc->frame->data[0], 0, cc->frame->linesize[0] * avctx->height);
292  memset(cc->frame->data[1], 0, AVPALETTE_SIZE);
293  }
294 
295  command = bytestream2_get_byte(&gb);
296  inst = bytestream2_get_byte(&gb);
297  inst &= CDG_MASK;
298  bytestream2_skip(&gb, 2);
299  bytestream2_get_buffer(&gb, cdg_data, sizeof(cdg_data));
300 
301  if ((command & CDG_MASK) == CDG_COMMAND) {
302  switch (inst) {
303  case CDG_INST_MEMORY_PRESET:
304  if (!(cdg_data[1] & 0x0F))
305  memset(cc->frame->data[0], cdg_data[0] & 0x0F,
306  cc->frame->linesize[0] * CDG_FULL_HEIGHT);
307  break;
308  case CDG_INST_LOAD_PAL_LO:
309  case CDG_INST_LOAD_PAL_HIGH:
310  if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) {
311  av_log(avctx, AV_LOG_ERROR, "buffer too small for loading palette\n");
312  return AVERROR(EINVAL);
313  }
314 
315  cdg_load_palette(cc, cdg_data, inst == CDG_INST_LOAD_PAL_LO);
316  break;
317  case CDG_INST_BORDER_PRESET:
318  cdg_border_preset(cc, cdg_data);
319  break;
320  case CDG_INST_TILE_BLOCK_XOR:
321  case CDG_INST_TILE_BLOCK:
322  if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) {
323  av_log(avctx, AV_LOG_ERROR, "buffer too small for drawing tile\n");
324  return AVERROR(EINVAL);
325  }
326 
327  ret = cdg_tile_block(cc, cdg_data, inst == CDG_INST_TILE_BLOCK_XOR);
328  if (ret) {
329  av_log(avctx, AV_LOG_ERROR, "tile is out of range\n");
330  return ret;
331  }
332  break;
333  case CDG_INST_SCROLL_PRESET:
334  case CDG_INST_SCROLL_COPY:
335  if (buf_size - CDG_HEADER_SIZE < CDG_MINIMUM_SCROLL_SIZE) {
336  av_log(avctx, AV_LOG_ERROR, "buffer too small for scrolling\n");
337  return AVERROR(EINVAL);
338  }
339 
340  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
341  return ret;
342 
343  cdg_scroll(cc, cdg_data, frame, inst == CDG_INST_SCROLL_COPY);
344  av_frame_unref(cc->frame);
345  ret = av_frame_ref(cc->frame, frame);
346  if (ret < 0)
347  return ret;
348  break;
349  case CDG_INST_TRANSPARENT_COL:
350  cc->transparency = cdg_data[0] & 0xF;
351  break;
352  default:
353  break;
354  }
355 
356  if (!frame->data[0]) {
357  ret = av_frame_ref(frame, cc->frame);
358  if (ret < 0)
359  return ret;
360  }
361  *got_frame = 1;
362  } else {
363  *got_frame = 0;
364  }
365 
366  return avpkt->size;
367 }
368 
369  static av_cold int cdg_decode_end(AVCodecContext *avctx)
370 {
371  CDGraphicsContext *cc = avctx->priv_data;
372 
373  av_frame_free(&cc->frame);
374 
375  return 0;
376 }
377 
378  AVCodec ff_cdgraphics_decoder = {
379  .name = "cdgraphics",
380  .long_name = NULL_IF_CONFIG_SMALL("CD Graphics video"),
381  .type = AVMEDIA_TYPE_VIDEO,
382  .id = AV_CODEC_ID_CDGRAPHICS,
383  .priv_data_size = sizeof(CDGraphicsContext),
384  .init = cdg_decode_init,
385  .close = cdg_decode_end,
386  .decode = cdg_decode_frame,
387  .capabilities = AV_CODEC_CAP_DR1,
388 };
CDG_BORDER_HEIGHT
#define CDG_BORDER_HEIGHT
Definition: cdgraphics.c:40
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:181
h
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Definition: vp9dsp_template.c:2093
CDG_INST_TRANSPARENT_COL
#define CDG_INST_TRANSPARENT_COL
Definition: cdgraphics.c:52
CDG_TILE_WIDTH
#define CDG_TILE_WIDTH
Definition: cdgraphics.c:61
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Definition: vf_curves.c:108
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Definition: avrndec.c:35
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Definition: avcodec.h:1468
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Definition: vf_curves.c:109
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enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1752
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static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
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static void cdg_border_preset(CDGraphicsContext *cc, uint8_t *data)
Definition: cdgraphics.c:90
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#define CDG_INST_LOAD_PAL_HIGH
Definition: cdgraphics.c:54
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Definition: avcodec.h:3392
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#define UP
Definition: cdgraphics.c:166
CDG_INST_SCROLL_PRESET
#define CDG_INST_SCROLL_PRESET
Definition: cdgraphics.c:50
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static void cdg_fill_wrapper(int out_tl_x, int out_tl_y, uint8_t *out, int in_tl_x, int in_tl_y, uint8_t *in, int color, int w, int h, int stride, int roll)
Definition: cdgraphics.c:192
cdg_tile_block
static int cdg_tile_block(CDGraphicsContext *cc, uint8_t *data, int b)
Definition: cdgraphics.c:132
uint8_t
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Definition: audio_convert.c:194
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#define av_cold
Definition: attributes.h:82
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AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:141
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static void cdg_copy_rect_buf(int out_tl_x, int out_tl_y, uint8_t *out, int in_tl_x, int in_tl_y, uint8_t *in, int w, int h, int stride)
Definition: cdgraphics.c:171
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Definition: pixfmt.h:74
CDG_COMMAND
#define CDG_COMMAND
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Definition: cdgraphics.c:43
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static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:94
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#define AVPALETTE_SIZE
Definition: pixfmt.h:33
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int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:375
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Definition: demuxing_decoding.c:53
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Definition: avcodec.h:1467
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Definition: tableprint_vlc.h:28
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Definition: vp56_arith.h:37
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#define CDG_HEADER_SIZE
Definition: cdgraphics.c:64
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#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
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static av_cold int cdg_decode_init(AVCodecContext *avctx)
Definition: cdgraphics.c:74
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#define CDG_MINIMUM_PKT_SIZE
Definition: cdgraphics.c:62
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#define AVERROR(e)
Definition: error.h:43
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static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
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static void cdg_fill_rect_preset(int tl_x, int tl_y, uint8_t *out, int color, int w, int h, int stride)
Definition: cdgraphics.c:183
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void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:154
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#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
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Definition: cdgraphics.c:65
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Definition: vf_curves.c:107
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Definition: bytestream.h:263
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#define CDG_INST_BORDER_PRESET
Definition: cdgraphics.c:48
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static av_cold int cdg_decode_end(AVCodecContext *avctx)
Definition: cdgraphics.c:369
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#define CDG_INST_TILE_BLOCK
Definition: cdgraphics.c:49
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const char * name
Name of the codec implementation.
Definition: avcodec.h:3399
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#define FFMAX(a, b)
Definition: common.h:94
AV_CODEC_ID_CDGRAPHICS
Definition: avcodec.h:239
CDG_FULL_WIDTH
#define CDG_FULL_WIDTH
default screen sizes
Definition: cdgraphics.c:35
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int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: utils.c:943
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#define FFMIN(a, b)
Definition: common.h:96
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static int cdg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: cdgraphics.c:266
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int width
picture width / height.
Definition: avcodec.h:1711
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#define CDG_INST_MEMORY_PRESET
instruction codes
Definition: cdgraphics.c:47
CDG_TILE_HEIGHT
#define CDG_TILE_HEIGHT
Definition: cdgraphics.c:60
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static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data, AVFrame *new_frame, int roll_over)
Definition: cdgraphics.c:204
AVCodecContext::height
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Definition: avcodec.h:1711
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#define CDG_DATA_SIZE
Definition: cdgraphics.c:59
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Definition: movenc-test.c:54
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static void cdg_load_palette(CDGraphicsContext *cc, uint8_t *data, int low)
Definition: cdgraphics.c:112
avcodec.h
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CDGraphicsContext::frame
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Definition: cdgraphics.c:68
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Definition: cdgraphics.c:378
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int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:209
AVCodecContext
main external API structure.
Definition: avcodec.h:1532
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#define CDG_INST_LOAD_PAL_LO
Definition: cdgraphics.c:53
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static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Definition: vf_drawtext.c:767
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:894
in
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-> in
Definition: audio_convert.c:194
DOWN
#define DOWN
Definition: cdgraphics.c:167
buf
void * buf
Definition: avisynth_c.h:553
AVFrame::palette_has_changed
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:322
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:474
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:192
CDG_INST_TILE_BLOCK_XOR
#define CDG_INST_TILE_BLOCK_XOR
Definition: cdgraphics.c:55
decode
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:572
palette
int palette
Definition: v4l.c:61
stride
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
CDG_BORDER_WIDTH
#define CDG_BORDER_WIDTH
Definition: cdgraphics.c:39
internal.h
common internal api header.
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:1574
CDG_FULL_HEIGHT
#define CDG_FULL_HEIGHT
Definition: cdgraphics.c:36
RIGHT
#define RIGHT
Definition: cdgraphics.c:169
AVCodecContext::frame_number
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2318
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:193
CDG_INST_SCROLL_COPY
#define CDG_INST_SCROLL_COPY
Definition: cdgraphics.c:51
stride
#define stride
LEFT
#define LEFT
Definition: cdgraphics.c:168
CDG_MASK
#define CDG_MASK
Definition: cdgraphics.c:44
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1444
AV_GET_BUFFER_FLAG_REF
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:1241
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:856
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
CDG_MINIMUM_SCROLL_SIZE
#define CDG_MINIMUM_SCROLL_SIZE
Definition: cdgraphics.c:63
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