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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 {
69  int hscroll;
70  int vscroll;
72  int cleared;
74 
76 {
77  CDGraphicsContext *cc = avctx->priv_data;
78 
79  cc->frame = av_frame_alloc();
80  if (!cc->frame)
81  return AVERROR(ENOMEM);
82  cc->transparency = -1;
83 
84  avctx->width = CDG_FULL_WIDTH;
85  avctx->height = CDG_FULL_HEIGHT;
86  avctx->pix_fmt = AV_PIX_FMT_PAL8;
87 
88  return 0;
89 }
90 
92 {
93  int y;
94  int lsize = cc->frame->linesize[0];
95  uint8_t *buf = cc->frame->data[0];
96  int color = data[0] & 0x0F;
97 
98  if (!(data[1] & 0x0F)) {
99  /// fill the top and bottom borders
100  memset(buf, color, CDG_BORDER_HEIGHT * lsize);
101  memset(buf + (CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT) * lsize,
102  color, CDG_BORDER_HEIGHT * lsize);
103 
104  /// fill the side borders
105  for (y = CDG_BORDER_HEIGHT; y < CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT; y++) {
106  memset(buf + y * lsize, color, CDG_BORDER_WIDTH);
107  memset(buf + CDG_FULL_WIDTH - CDG_BORDER_WIDTH + y * lsize,
108  color, CDG_BORDER_WIDTH);
109  }
110  }
111 }
112 
113 static void cdg_load_palette(CDGraphicsContext *cc, uint8_t *data, int low)
114 {
115  uint8_t r, g, b;
116  uint16_t color;
117  int i;
118  int array_offset = low ? 0 : 8;
119  uint32_t *palette = (uint32_t *) cc->frame->data[1];
120 
121  for (i = 0; i < 8; i++) {
122  color = (data[2 * i] << 6) + (data[2 * i + 1] & 0x3F);
123  r = ((color >> 8) & 0x000F) * 17;
124  g = ((color >> 4) & 0x000F) * 17;
125  b = ((color ) & 0x000F) * 17;
126  palette[i + array_offset] = 0xFFU << 24 | r << 16 | g << 8 | b;
127  if (cc->transparency >= 0)
128  palette[cc->transparency] &= 0xFFFFFF;
129  }
130  cc->frame->palette_has_changed = 1;
131 }
132 
134 {
135  unsigned ci, ri;
136  int color;
137  int x, y;
138  int ai;
139  int stride = cc->frame->linesize[0];
140  uint8_t *buf = cc->frame->data[0];
141 
142  ri = (data[2] & 0x1F) * CDG_TILE_HEIGHT + cc->vscroll;
143  ci = (data[3] & 0x3F) * CDG_TILE_WIDTH + cc->hscroll;
144 
145  if (ri > (CDG_FULL_HEIGHT - CDG_TILE_HEIGHT))
146  return AVERROR(EINVAL);
147  if (ci > (CDG_FULL_WIDTH - CDG_TILE_WIDTH))
148  return AVERROR(EINVAL);
149 
150  for (y = 0; y < CDG_TILE_HEIGHT; y++) {
151  for (x = 0; x < CDG_TILE_WIDTH; x++) {
152  if (!((data[4 + y] >> (5 - x)) & 0x01))
153  color = data[0] & 0x0F;
154  else
155  color = data[1] & 0x0F;
156 
157  ai = ci + x + (stride * (ri + y));
158  if (b)
159  color ^= buf[ai];
160  buf[ai] = color;
161  }
162  }
163 
164  return 0;
165 }
166 
167 #define UP 2
168 #define DOWN 1
169 #define LEFT 2
170 #define RIGHT 1
171 
172 static void cdg_copy_rect_buf(int out_tl_x, int out_tl_y, uint8_t *out,
173  int in_tl_x, int in_tl_y, uint8_t *in,
174  int w, int h, int stride)
175 {
176  int y;
177 
178  in += in_tl_x + in_tl_y * stride;
179  out += out_tl_x + out_tl_y * stride;
180  for (y = 0; y < h; y++)
181  memcpy(out + y * stride, in + y * stride, w);
182 }
183 
184 static void cdg_fill_rect_preset(int tl_x, int tl_y, uint8_t *out,
185  int color, int w, int h, int stride)
186 {
187  int y;
188 
189  for (y = tl_y; y < tl_y + h; y++)
190  memset(out + tl_x + y * stride, color, w);
191 }
192 
193 static void cdg_fill_wrapper(int out_tl_x, int out_tl_y, uint8_t *out,
194  int in_tl_x, int in_tl_y, uint8_t *in,
195  int color, int w, int h, int stride, int roll)
196 {
197  if (roll) {
198  cdg_copy_rect_buf(out_tl_x, out_tl_y, out, in_tl_x, in_tl_y,
199  in, w, h, stride);
200  } else {
201  cdg_fill_rect_preset(out_tl_x, out_tl_y, out, color, w, h, stride);
202  }
203 }
204 
206  AVFrame *new_frame, int roll_over)
207 {
208  int color;
209  int hscmd, h_off, hinc, vscmd, v_off, vinc;
210  int y;
211  int stride = cc->frame->linesize[0];
212  uint8_t *in = cc->frame->data[0];
213  uint8_t *out = new_frame->data[0];
214 
215  color = data[0] & 0x0F;
216  hscmd = (data[1] & 0x30) >> 4;
217  vscmd = (data[2] & 0x30) >> 4;
218 
219  h_off = FFMIN(data[1] & 0x07, CDG_BORDER_WIDTH - 1);
220  v_off = FFMIN(data[2] & 0x0F, CDG_BORDER_HEIGHT - 1);
221 
222  /// find the difference and save the offset for cdg_tile_block usage
223  hinc = h_off - cc->hscroll;
224  vinc = v_off - cc->vscroll;
225  cc->hscroll = h_off;
226  cc->vscroll = v_off;
227 
228  if (vscmd == UP)
229  vinc -= 12;
230  if (vscmd == DOWN)
231  vinc += 12;
232  if (hscmd == LEFT)
233  hinc -= 6;
234  if (hscmd == RIGHT)
235  hinc += 6;
236 
237  if (!hinc && !vinc)
238  return;
239 
240  memcpy(new_frame->data[1], cc->frame->data[1], CDG_PALETTE_SIZE * 4);
241 
242  for (y = FFMAX(0, vinc); y < FFMIN(CDG_FULL_HEIGHT + vinc, CDG_FULL_HEIGHT); y++)
243  memcpy(out + FFMAX(0, hinc) + stride * y,
244  in + FFMAX(0, hinc) - hinc + (y - vinc) * stride,
245  FFMIN(stride + hinc, stride));
246 
247  if (vinc > 0)
248  cdg_fill_wrapper(0, 0, out,
249  0, CDG_FULL_HEIGHT - vinc, in, color,
250  stride, vinc, stride, roll_over);
251  else if (vinc < 0)
252  cdg_fill_wrapper(0, CDG_FULL_HEIGHT + vinc, out,
253  0, 0, in, color,
254  stride, -1 * vinc, stride, roll_over);
255 
256  if (hinc > 0)
257  cdg_fill_wrapper(0, 0, out,
258  CDG_FULL_WIDTH - hinc, 0, in, color,
259  hinc, CDG_FULL_HEIGHT, stride, roll_over);
260  else if (hinc < 0)
261  cdg_fill_wrapper(CDG_FULL_WIDTH + hinc, 0, out,
262  0, 0, in, color,
263  -1 * hinc, CDG_FULL_HEIGHT, stride, roll_over);
264 
265 }
266 
268  void *data, int *got_frame, AVPacket *avpkt)
269 {
270  GetByteContext gb;
271  int buf_size = avpkt->size;
272  int ret;
273  uint8_t command, inst;
274  uint8_t cdg_data[CDG_DATA_SIZE] = {0};
275  AVFrame *frame = data;
276  CDGraphicsContext *cc = avctx->priv_data;
277 
278  if (buf_size < CDG_MINIMUM_PKT_SIZE) {
279  av_log(avctx, AV_LOG_ERROR, "buffer too small for decoder\n");
280  return AVERROR(EINVAL);
281  }
282  if (buf_size > CDG_HEADER_SIZE + CDG_DATA_SIZE) {
283  av_log(avctx, AV_LOG_ERROR, "buffer too big for decoder\n");
284  return AVERROR(EINVAL);
285  }
286 
287  bytestream2_init(&gb, avpkt->data, avpkt->size);
288 
289  if ((ret = ff_reget_buffer(avctx, cc->frame)) < 0)
290  return ret;
291  if (!cc->cleared) {
292  memset(cc->frame->data[0], 0, cc->frame->linesize[0] * avctx->height);
293  memset(cc->frame->data[1], 0, AVPALETTE_SIZE);
294  cc->cleared = 1;
295  }
296 
297  command = bytestream2_get_byte(&gb);
298  inst = bytestream2_get_byte(&gb);
299  inst &= CDG_MASK;
300  bytestream2_skip(&gb, 2);
301  bytestream2_get_buffer(&gb, cdg_data, sizeof(cdg_data));
302 
303  if ((command & CDG_MASK) == CDG_COMMAND) {
304  switch (inst) {
306  if (!(cdg_data[1] & 0x0F))
307  memset(cc->frame->data[0], cdg_data[0] & 0x0F,
308  cc->frame->linesize[0] * CDG_FULL_HEIGHT);
309  break;
312  if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) {
313  av_log(avctx, AV_LOG_ERROR, "buffer too small for loading palette\n");
314  return AVERROR(EINVAL);
315  }
316 
317  cdg_load_palette(cc, cdg_data, inst == CDG_INST_LOAD_PAL_LO);
318  break;
320  cdg_border_preset(cc, cdg_data);
321  break;
323  case CDG_INST_TILE_BLOCK:
324  if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) {
325  av_log(avctx, AV_LOG_ERROR, "buffer too small for drawing tile\n");
326  return AVERROR(EINVAL);
327  }
328 
329  ret = cdg_tile_block(cc, cdg_data, inst == CDG_INST_TILE_BLOCK_XOR);
330  if (ret) {
331  av_log(avctx, AV_LOG_ERROR, "tile is out of range\n");
332  return ret;
333  }
334  break;
337  if (buf_size - CDG_HEADER_SIZE < CDG_MINIMUM_SCROLL_SIZE) {
338  av_log(avctx, AV_LOG_ERROR, "buffer too small for scrolling\n");
339  return AVERROR(EINVAL);
340  }
341 
342  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
343  return ret;
344 
345  cdg_scroll(cc, cdg_data, frame, inst == CDG_INST_SCROLL_COPY);
346  av_frame_unref(cc->frame);
347  ret = av_frame_ref(cc->frame, frame);
348  if (ret < 0)
349  return ret;
350  break;
352  cc->transparency = cdg_data[0] & 0xF;
353  break;
354  default:
355  break;
356  }
357 
358  if (!frame->data[0]) {
359  ret = av_frame_ref(frame, cc->frame);
360  if (ret < 0)
361  return ret;
362  }
363  *got_frame = 1;
364  } else {
365  *got_frame = 0;
366  }
367 
368  return avpkt->size;
369 }
370 
372 {
373  CDGraphicsContext *cc = avctx->priv_data;
374 
375  av_frame_free(&cc->frame);
376 
377  return 0;
378 }
379 
381  .name = "cdgraphics",
382  .long_name = NULL_IF_CONFIG_SMALL("CD Graphics video"),
383  .type = AVMEDIA_TYPE_VIDEO,
385  .priv_data_size = sizeof(CDGraphicsContext),
387  .close = cdg_decode_end,
389  .capabilities = AV_CODEC_CAP_DR1,
390 };
#define CDG_BORDER_HEIGHT
Definition: cdgraphics.c:40
This structure describes decoded (raw) audio or video data.
Definition: frame.h:218
#define CDG_INST_TRANSPARENT_COL
Definition: cdgraphics.c:52
#define CDG_TILE_WIDTH
Definition: cdgraphics.c:61
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
const char * g
Definition: vf_curves.c:112
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1445
const char * b
Definition: vf_curves.c:113
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1742
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
static void cdg_border_preset(CDGraphicsContext *cc, uint8_t *data)
Definition: cdgraphics.c:91
#define CDG_INST_LOAD_PAL_HIGH
Definition: cdgraphics.c:54
AVCodec.
Definition: avcodec.h:3423
#define UP
Definition: cdgraphics.c:167
#define CDG_INST_SCROLL_PRESET
Definition: cdgraphics.c:50
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
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: decode.c:1969
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:193
static int cdg_tile_block(CDGraphicsContext *cc, uint8_t *data, int b)
Definition: cdgraphics.c:133
uint8_t
#define av_cold
Definition: attributes.h:82
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:189
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:172
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
#define CDG_COMMAND
masks
Definition: cdgraphics.c:43
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:92
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
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:441
static AVFrame * frame
uint8_t * data
Definition: avcodec.h:1444
#define av_log(a,...)
#define U(x)
Definition: vp56_arith.h:37
#define CDG_HEADER_SIZE
Definition: cdgraphics.c:64
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static av_cold int cdg_decode_init(AVCodecContext *avctx)
Definition: cdgraphics.c:75
#define CDG_MINIMUM_PKT_SIZE
Definition: cdgraphics.c:62
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
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:184
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define CDG_PALETTE_SIZE
Definition: cdgraphics.c:65
const char * r
Definition: vf_curves.c:111
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:263
#define CDG_INST_BORDER_PRESET
Definition: cdgraphics.c:48
static av_cold int cdg_decode_end(AVCodecContext *avctx)
Definition: cdgraphics.c:371
#define CDG_INST_TILE_BLOCK
Definition: cdgraphics.c:49
const char * name
Name of the codec implementation.
Definition: avcodec.h:3430
#define FFMAX(a, b)
Definition: common.h:94
#define CDG_FULL_WIDTH
default screen sizes
Definition: cdgraphics.c:35
#define FFMIN(a, b)
Definition: common.h:96
static int cdg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: cdgraphics.c:267
int width
picture width / height.
Definition: avcodec.h:1705
uint8_t w
Definition: llviddspenc.c:38
#define CDG_INST_MEMORY_PRESET
instruction codes
Definition: cdgraphics.c:47
#define CDG_TILE_HEIGHT
Definition: cdgraphics.c:60
static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data, AVFrame *new_frame, int roll_over)
Definition: cdgraphics.c:205
#define CDG_DATA_SIZE
Definition: cdgraphics.c:59
static void cdg_load_palette(CDGraphicsContext *cc, uint8_t *data, int low)
Definition: cdgraphics.c:113
Libavcodec external API header.
AVFrame * frame
Definition: cdgraphics.c:68
AVCodec ff_cdgraphics_decoder
Definition: cdgraphics.c:380
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:249
main external API structure.
Definition: avcodec.h:1532
#define CDG_INST_LOAD_PAL_LO
Definition: cdgraphics.c:53
static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Definition: vf_drawtext.c:863
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1922
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
#define DOWN
Definition: cdgraphics.c:168
void * buf
Definition: avisynth_c.h:690
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:375
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:551
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:232
#define CDG_INST_TILE_BLOCK_XOR
Definition: cdgraphics.c:55
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
#define CDG_BORDER_WIDTH
Definition: cdgraphics.c:39
common internal api header.
void * priv_data
Definition: avcodec.h:1559
#define CDG_FULL_HEIGHT
Definition: cdgraphics.c:36
#define RIGHT
Definition: cdgraphics.c:170
FILE * out
Definition: movenc.c:54
#define CDG_INST_SCROLL_COPY
Definition: cdgraphics.c:51
#define stride
#define LEFT
Definition: cdgraphics.c:169
#define CDG_MASK
Definition: cdgraphics.c:44
This structure stores compressed data.
Definition: avcodec.h:1421
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:1143
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:967
for(j=16;j >0;--j)
#define CDG_MINIMUM_SCROLL_SIZE
Definition: cdgraphics.c:63