FFmpeg: libavcodec/dxvenc.c Source File

FFmpeg
dxvenc.c
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1 /*
2  * Resolume DXV encoder
3  * Copyright (C) 2024 Emma Worley <emma@emma.gg>
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 <stdint.h>
23 
24 #include "libavcodec/hashtable.h"
25 #include "libavutil/imgutils.h"
26 #include "libavutil/mem.h"
27 #include "libavutil/opt.h"
28 
29 #include "bytestream.h"
30 #include "codec_internal.h"
31 #include "dxv.h"
32 #include "encode.h"
33 #include "texturedsp.h"
34 
35  #define DXV_HEADER_LENGTH 12
36 
37 /*
38  * Resolume will refuse to display frames that are not padded to 16x16 pixels.
39  */
40  #define DXV_ALIGN(x) FFALIGN(x, 16)
41 
42 /*
43  * DXV uses LZ-like back-references to avoid copying words that have already
44  * appeared in the decompressed stream. Using a simple hash table (HT)
45  * significantly speeds up the lookback process while encoding.
46  */
47  #define LOOKBACK_HT_ELEMS 0x20202
48  #define LOOKBACK_WORDS 0x20202
49 
50  typedef struct DXVEncContext {
51   AVClass *class;
52 
53   PutByteContext pbc;
54 
55   uint8_t *tex_data; // Compressed texture
56   int64_t tex_size; // Texture size
57 
58  /* Optimal number of slices for parallel decoding */
59   int slice_count;
60 
61   TextureDSPThreadContext enc;
62 
63   DXVTextureFormat tex_fmt;
64   int (*compress_tex)(AVCodecContext *avctx);
65 
66   FFHashtableContext *color_ht;
67   FFHashtableContext *lut_ht;
68   FFHashtableContext *combo_ht;
69 } DXVEncContext;
70 
71 /* Converts an index offset value to a 2-bit opcode and pushes it to a stream.
72  * Inverse of CHECKPOINT in dxv.c. */
73  #define PUSH_OP(x) \
74  do { \
75  if (state == 16) { \
76  if (bytestream2_get_bytes_left_p(pbc) < 4) { \
77  return AVERROR_INVALIDDATA; \
78  } \
79  value = pbc->buffer; \
80  bytestream2_put_le32(pbc, 0); \
81  state = 0; \
82  } \
83  if (idx >= 0x102 * x) { \
84  op = 3; \
85  bytestream2_put_le16(pbc, (idx / x) - 0x102); \
86  } else if (idx >= 2 * x) { \
87  op = 2; \
88  bytestream2_put_byte(pbc, (idx / x) - 2); \
89  } else if (idx == x) { \
90  op = 1; \
91  } else { \
92  op = 0; \
93  } \
94  AV_WL32(value, AV_RL32(value) | (op << (state * 2))); \
95  state++; \
96  } while (0)
97 
98  static int dxv_compress_dxt1(AVCodecContext *avctx)
99 {
100  DXVEncContext *ctx = avctx->priv_data;
101  PutByteContext *pbc = &ctx->pbc;
102  void *value;
103  uint32_t idx, combo_idx, prev_pos, old_pos, state = 16, pos = 0, op = 0;
104 
105  ff_hashtable_clear(ctx->color_ht);
106  ff_hashtable_clear(ctx->lut_ht);
107  ff_hashtable_clear(ctx->combo_ht);
108 
109  ff_hashtable_set(ctx->combo_ht, ctx->tex_data, &pos);
110 
111  bytestream2_put_le32(pbc, AV_RL32(ctx->tex_data));
112  ff_hashtable_set(ctx->color_ht, ctx->tex_data, &pos);
113  pos++;
114  bytestream2_put_le32(pbc, AV_RL32(ctx->tex_data + 4));
115  ff_hashtable_set(ctx->lut_ht, ctx->tex_data + 4, &pos);
116  pos++;
117 
118  while (pos + 2 <= ctx->tex_size / 4) {
119  combo_idx = ff_hashtable_get(ctx->combo_ht, ctx->tex_data + pos * 4, &prev_pos) ? pos - prev_pos : 0;
120  idx = combo_idx;
121  PUSH_OP(2);
122  if (pos >= LOOKBACK_WORDS) {
123  old_pos = pos - LOOKBACK_WORDS;
124  if (ff_hashtable_get(ctx->combo_ht, ctx->tex_data + old_pos * 4, &prev_pos) && prev_pos <= old_pos)
125  ff_hashtable_delete(ctx->combo_ht, ctx->tex_data + old_pos * 4);
126  }
127  ff_hashtable_set(ctx->combo_ht, ctx->tex_data + pos * 4, &pos);
128 
129  if (!combo_idx) {
130  idx = ff_hashtable_get(ctx->color_ht, ctx->tex_data + pos * 4, &prev_pos) ? pos - prev_pos : 0;
131  PUSH_OP(2);
132  if (!idx)
133  bytestream2_put_le32(pbc, AV_RL32(ctx->tex_data + pos * 4));
134  }
135  if (pos >= LOOKBACK_WORDS) {
136  old_pos = pos - LOOKBACK_WORDS;
137  if (ff_hashtable_get(ctx->color_ht, ctx->tex_data + old_pos * 4, &prev_pos) && prev_pos <= old_pos)
138  ff_hashtable_delete(ctx->color_ht, ctx->tex_data + old_pos * 4);
139  }
140  ff_hashtable_set(ctx->color_ht, ctx->tex_data + pos * 4, &pos);
141  pos++;
142 
143  if (!combo_idx) {
144  idx = ff_hashtable_get(ctx->lut_ht, ctx->tex_data + pos * 4, &prev_pos) ? pos - prev_pos : 0;
145  PUSH_OP(2);
146  if (!idx)
147  bytestream2_put_le32(pbc, AV_RL32(ctx->tex_data + pos * 4));
148  }
149  if (pos >= LOOKBACK_WORDS) {
150  old_pos = pos - LOOKBACK_WORDS;
151  if (ff_hashtable_get(ctx->lut_ht, ctx->tex_data + old_pos * 4, &prev_pos) && prev_pos <= old_pos)
152  ff_hashtable_delete(ctx->lut_ht, ctx->tex_data + old_pos * 4);
153  }
154  ff_hashtable_set(ctx->lut_ht, ctx->tex_data + pos * 4, &pos);
155  pos++;
156  }
157 
158  return 0;
159 }
160 
161  static int dxv_encode(AVCodecContext *avctx, AVPacket *pkt,
162  const AVFrame *frame, int *got_packet)
163 {
164  DXVEncContext *ctx = avctx->priv_data;
165  PutByteContext *pbc = &ctx->pbc;
166  int ret;
167 
168  /* unimplemented: needs to depend on compression ratio of tex format */
169  /* under DXT1, we need 3 words to encode load ops for 32 words.
170  * the first 2 words of the texture do not need load ops. */
171  ret = ff_alloc_packet(avctx, pkt, DXV_HEADER_LENGTH + ctx->tex_size + AV_CEIL_RSHIFT(ctx->tex_size - 8, 7) * 12);
172  if (ret < 0)
173  return ret;
174 
175  if (ctx->enc.tex_funct) {
176  uint8_t *safe_data[4] = {frame->data[0], 0, 0, 0};
177  int safe_linesize[4] = {frame->linesize[0], 0, 0, 0};
178 
179  if (avctx->width != DXV_ALIGN(avctx->width) || avctx->height != DXV_ALIGN(avctx->height)) {
180  ret = av_image_alloc(
181  safe_data,
182  safe_linesize,
183  DXV_ALIGN(avctx->width),
184  DXV_ALIGN(avctx->height),
185  avctx->pix_fmt,
186  1);
187  if (ret < 0)
188  return ret;
189 
190  av_image_copy2(
191  safe_data,
192  safe_linesize,
193  frame->data,
194  frame->linesize,
195  avctx->pix_fmt,
196  avctx->width,
197  avctx->height);
198 
199  if (avctx->width != DXV_ALIGN(avctx->width)) {
200  av_assert0(frame->format == AV_PIX_FMT_RGBA);
201  for (int y = 0; y < avctx->height; y++) {
202  memset(safe_data[0] + y * safe_linesize[0] + 4*avctx->width, 0, safe_linesize[0] - 4*avctx->width);
203  }
204  }
205  if (avctx->height != DXV_ALIGN(avctx->height)) {
206  for (int y = avctx->height; y < DXV_ALIGN(avctx->height); y++) {
207  memset(safe_data[0] + y * safe_linesize[0], 0, safe_linesize[0]);
208  }
209  }
210  }
211 
212  ctx->enc.tex_data.out = ctx->tex_data;
213  ctx->enc.frame_data.in = safe_data[0];
214  ctx->enc.stride = safe_linesize[0];
215  ctx->enc.width = DXV_ALIGN(avctx->width);
216  ctx->enc.height = DXV_ALIGN(avctx->height);
217  ff_texturedsp_exec_compress_threads(avctx, &ctx->enc);
218 
219  if (safe_data[0] != frame->data[0])
220  av_freep(&safe_data[0]);
221  } else {
222  /* unimplemented: YCoCg formats */
223  return AVERROR_INVALIDDATA;
224  }
225 
226  bytestream2_init_writer(pbc, pkt->data, pkt->size);
227 
228  bytestream2_put_le32(pbc, ctx->tex_fmt);
229  bytestream2_put_byte(pbc, 4);
230  bytestream2_put_byte(pbc, 0);
231  bytestream2_put_byte(pbc, 0);
232  bytestream2_put_byte(pbc, 0);
233  /* Fill in compressed size later */
234  bytestream2_skip_p(pbc, 4);
235 
236  ret = ctx->compress_tex(avctx);
237  if (ret < 0)
238  return ret;
239 
240  AV_WL32(pkt->data + 8, bytestream2_tell_p(pbc) - DXV_HEADER_LENGTH);
241  av_shrink_packet(pkt, bytestream2_tell_p(pbc));
242 
243  *got_packet = 1;
244  return 0;
245 }
246 
247  static av_cold int dxv_init(AVCodecContext *avctx)
248 {
249  DXVEncContext *ctx = avctx->priv_data;
250  TextureDSPEncContext texdsp;
251  int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
252 
253  if (ret < 0) {
254  av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
255  avctx->width, avctx->height);
256  return ret;
257  }
258 
259  ff_texturedspenc_init(&texdsp);
260 
261  switch (ctx->tex_fmt) {
262  case DXV_FMT_DXT1:
263  ctx->compress_tex = dxv_compress_dxt1;
264  ctx->enc.tex_funct = texdsp.dxt1_block;
265  ctx->enc.tex_ratio = 8;
266  break;
267  default:
268  av_log(avctx, AV_LOG_ERROR, "Invalid format %08X\n", ctx->tex_fmt);
269  return AVERROR_INVALIDDATA;
270  }
271  ctx->enc.raw_ratio = 16;
272  ctx->tex_size = DXV_ALIGN(avctx->width) / TEXTURE_BLOCK_W *
273  DXV_ALIGN(avctx->height) / TEXTURE_BLOCK_H *
274  ctx->enc.tex_ratio;
275  ctx->enc.slice_count = av_clip(avctx->thread_count, 1, DXV_ALIGN(avctx->height) / TEXTURE_BLOCK_H);
276 
277  ctx->tex_data = av_malloc(ctx->tex_size);
278  if (!ctx->tex_data) {
279  return AVERROR(ENOMEM);
280  }
281 
282  ret = ff_hashtable_alloc(&ctx->color_ht, sizeof(uint32_t), sizeof(uint32_t), LOOKBACK_HT_ELEMS);
283  if (ret < 0)
284  return ret;
285  ret = ff_hashtable_alloc(&ctx->lut_ht, sizeof(uint32_t), sizeof(uint32_t), LOOKBACK_HT_ELEMS);
286  if (ret < 0)
287  return ret;
288  ret = ff_hashtable_alloc(&ctx->combo_ht, sizeof(uint64_t), sizeof(uint32_t), LOOKBACK_HT_ELEMS);
289  if (ret < 0)
290  return ret;
291 
292  return 0;
293 }
294 
295  static av_cold int dxv_close(AVCodecContext *avctx)
296 {
297  DXVEncContext *ctx = avctx->priv_data;
298 
299  av_freep(&ctx->tex_data);
300 
301  ff_hashtable_freep(&ctx->color_ht);
302  ff_hashtable_freep(&ctx->lut_ht);
303  ff_hashtable_freep(&ctx->combo_ht);
304 
305  return 0;
306 }
307 
308  #define OFFSET(x) offsetof(DXVEncContext, x)
309  #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
310  static const AVOption options[] = {
311  { "format", NULL, OFFSET(tex_fmt), AV_OPT_TYPE_INT, { .i64 = DXV_FMT_DXT1 }, DXV_FMT_DXT1, DXV_FMT_DXT1, FLAGS, .unit = "format" },
312  { "dxt1", "DXT1 (Normal Quality, No Alpha)", 0, AV_OPT_TYPE_CONST, { .i64 = DXV_FMT_DXT1 }, 0, 0, FLAGS, .unit = "format" },
313  { NULL },
314 };
315 
316  static const AVClass dxvenc_class = {
317  .class_name = "DXV encoder",
318  .option = options,
319  .version = LIBAVUTIL_VERSION_INT,
320 };
321 
322  const FFCodec ff_dxv_encoder = {
323  .p.name = "dxv",
324  CODEC_LONG_NAME("Resolume DXV"),
325  .p.type = AVMEDIA_TYPE_VIDEO,
326  .p.id = AV_CODEC_ID_DXV,
327  .init = dxv_init,
328  FF_CODEC_ENCODE_CB(dxv_encode),
329  .close = dxv_close,
330  .priv_data_size = sizeof(DXVEncContext),
331  .p.capabilities = AV_CODEC_CAP_DR1 |
332  AV_CODEC_CAP_SLICE_THREADS |
333  AV_CODEC_CAP_FRAME_THREADS,
334  .p.priv_class = &dxvenc_class,
335  CODEC_PIXFMTS(AV_PIX_FMT_RGBA),
336  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
337 };
DXVEncContext::lut_ht
FFHashtableContext * lut_ht
Definition: dxvenc.c:67
CODEC_PIXFMTS
#define CODEC_PIXFMTS(...)
Definition: codec_internal.h:391
DXV_FMT_DXT1
@ DXV_FMT_DXT1
Definition: dxv.h:28
av_clip
#define av_clip
Definition: common.h:100
DXVEncContext
Definition: dxvenc.c:50
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
ff_hashtable_delete
int ff_hashtable_delete(struct FFHashtableContext *ctx, const void *key)
Delete a value from a hash table given a key.
Definition: hashtable.c:163
AVERROR
Filter the word "frame" indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
AV_WL32
#define AV_WL32(p, v)
Definition: intreadwrite.h:422
TEXTURE_BLOCK_H
#define TEXTURE_BLOCK_H
Definition: texturedsp.h:43
dxvenc_class
static const AVClass dxvenc_class
Definition: dxvenc.c:316
int64_t
long long int64_t
Definition: coverity.c:34
ff_dxv_encoder
const FFCodec ff_dxv_encoder
Definition: dxvenc.c:322
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:427
AVPacket::data
uint8_t * data
Definition: packet.h:558
TextureDSPEncContext
Definition: texturedsp.h:63
AVOption
AVOption.
Definition: opt.h:429
encode.h
OFFSET
#define OFFSET(x)
Definition: dxvenc.c:308
FFCodec
Definition: codec_internal.h:127
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av_cold void ff_hashtable_freep(FFHashtableContext **ctx)
Free a hash table.
Definition: hashtable.c:206
LOOKBACK_WORDS
#define LOOKBACK_WORDS
Definition: dxvenc.c:48
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#define av_malloc(s)
Definition: tableprint_vlc.h:31
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void ff_texturedspenc_init(TextureDSPEncContext *c)
Definition: texturedspenc.c:650
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
AVCodecContext::thread_count
int thread_count
thread count is used to decide how many independent tasks should be passed to execute()
Definition: avcodec.h:1561
av_shrink_packet
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: packet.c:114
DXVEncContext::enc
TextureDSPThreadContext enc
Definition: dxvenc.c:61
DXV_HEADER_LENGTH
#define DXV_HEADER_LENGTH
Definition: dxvenc.c:35
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#define FF_CODEC_ENCODE_CB(func)
Definition: codec_internal.h:358
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static int dxv_encode(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
Definition: dxvenc.c:161
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Definition: texturedsp.h:69
LOOKBACK_HT_ELEMS
#define LOOKBACK_HT_ELEMS
Definition: dxvenc.c:47
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static const AVOption options[]
Definition: dxvenc.c:310
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Definition: movenc.c:60
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#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:210
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#define av_cold
Definition: attributes.h:106
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Definition: dxvenc.c:55
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Definition: hashtable.c:34
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static av_always_inline void bytestream2_init_writer(PutByteContext *p, uint8_t *buf, int buf_size)
Definition: bytestream.h:147
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:60
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static av_always_inline int bytestream2_tell_p(const PutByteContext *p)
Definition: bytestream.h:197
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static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:76
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static int dxv_compress_dxt1(AVCodecContext *avctx)
Definition: dxvenc.c:98
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#define av_assert0(cond)
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Definition: avassert.h:41
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Definition: movenc.c:49
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#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:331
AV_PIX_FMT_RGBA
@ AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:100
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Definition: dxv.h:27
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#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:95
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#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
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Describe the class of an AVClass context structure.
Definition: log.h:76
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#define NULL
Definition: coverity.c:32
options
Definition: swscale.c:43
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int slice_count
Definition: dxvenc.c:59
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Definition: dxvenc.c:295
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Definition: bytestream.h:37
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Allocate an image with size w and h and pixel format pix_fmt, and fill pointers and linesizes accordi...
Definition: imgutils.c:218
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Definition: codec.h:52
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Definition: packet.h:559
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Definition: dxvenc.c:247
AV_CODEC_ID_DXV
@ AV_CODEC_ID_DXV
Definition: codec_id.h:245
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void ff_hashtable_clear(struct FFHashtableContext *ctx)
Delete all values from a hash table.
Definition: hashtable.c:201
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Definition: dxvenc.c:56
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Definition: dxvenc.c:53
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#define AV_CODEC_CAP_SLICE_THREADS
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Definition: codec.h:99
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int ff_hashtable_set(struct FFHashtableContext *ctx, const void *key, const void *val)
Store a value in a hash table given a key.
Definition: hashtable.c:119
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static av_always_inline void bytestream2_skip_p(PutByteContext *p, unsigned int size)
Definition: bytestream.h:180
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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 default value
Definition: writing_filters.txt:86
DXV_ALIGN
#define DXV_ALIGN(x)
Definition: dxvenc.c:40
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#define TEXTURE_BLOCK_W
Definition: texturedsp.h:42
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const char * name
Name of the codec implementation.
Definition: codec.h:179
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Definition: avcodec.h:592
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:631
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#define FLAGS
Definition: dxvenc.c:309
state
static struct @531 state
ret
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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:81
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:265
pos
unsigned int pos
Definition: spdifenc.c:414
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DXVTextureFormat tex_fmt
Definition: dxvenc.c:63
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVCodecContext
main external API structure.
Definition: avcodec.h:431
TextureDSPEncContext::dxt1_block
int(* dxt1_block)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
Definition: texturedsp.h:64
av_image_copy2
static void av_image_copy2(uint8_t *const dst_data[4], const int dst_linesizes[4], uint8_t *const src_data[4], const int src_linesizes[4], enum AVPixelFormat pix_fmt, int width, int height)
Wrapper around av_image_copy() to workaround the limitation that the conversion from uint8_t * const ...
Definition: imgutils.h:184
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Underlying C type is int.
Definition: opt.h:259
DXVEncContext::combo_ht
FFHashtableContext * combo_ht
Definition: dxvenc.c:68
PUSH_OP
#define PUSH_OP(x)
Definition: dxvenc.c:73
Windows::Graphics::DirectX::Direct3D11::p
IDirect3DDxgiInterfaceAccess _COM_Outptr_ void ** p
Definition: vsrc_gfxcapture_winrt.hpp:53
DXVEncContext::compress_tex
int(* compress_tex)(AVCodecContext *avctx)
Definition: dxvenc.c:64
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:200
mem.h
dxv.h
AVPacket
This structure stores compressed data.
Definition: packet.h:535
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:458
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
DXVEncContext::color_ht
FFHashtableContext * color_ht
Definition: dxvenc.c:66
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:592
bytestream.h
ff_hashtable_get
int ff_hashtable_get(const struct FFHashtableContext *ctx, const void *key, void *val)
Look up a value from a hash table given a key.
Definition: hashtable.c:97
imgutils.h
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
av_image_check_size
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:318
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Special option type for declaring named constants.
Definition: opt.h:299
ff_alloc_packet
int ff_alloc_packet(AVCodecContext *avctx, AVPacket *avpkt, int64_t size)
Check AVPacket size and allocate data.
Definition: encode.c:60
ff_hashtable_alloc
av_cold int ff_hashtable_alloc(FFHashtableContext **ctx, size_t key_size, size_t val_size, size_t max_entries)
Create a fixed-sized Robin Hood hash table.
Definition: hashtable.c:59
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