FFmpeg
asvenc.c
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1 /*
2  * Copyright (c) 2003 Michael Niedermayer
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * ASUS V1/V2 encoder.
24  */
25 
26 #include "config_components.h"
27 
28 #include "libavutil/attributes.h"
29 #include "libavutil/mem.h"
30 #include "libavutil/mem_internal.h"
31 
32 #include "aandcttab.h"
33 #include "asv.h"
34 #include "avcodec.h"
35 #include "codec_internal.h"
36 #include "dct.h"
37 #include "encode.h"
38 #include "fdctdsp.h"
39 #include "mpeg12data.h"
40 #include "pixblockdsp.h"
41 #include "put_bits.h"
42 
43 typedef struct ASVEncContext {
45 
47 
50  DECLARE_ALIGNED(32, int16_t, block)[6][64];
51  int q_intra_matrix[64];
53 
54 static inline void asv1_put_level(PutBitContext *pb, int level)
55 {
56  unsigned int index = level + 3;
57 
58  if (index <= 6) {
60  } else {
61  put_bits(pb, 3, 0); /* Escape code */
62  put_sbits(pb, 8, level);
63  }
64 }
65 
66 static inline void asv2_put_level(ASVEncContext *a, PutBitContext *pb, int level)
67 {
68  unsigned int index = level + 31;
69 
70  if (index <= 62) {
72  } else {
73  put_bits_le(pb, 5, 0); /* Escape code */
74  if (level < -128 || level > 127) {
75  av_log(a->c.avctx, AV_LOG_WARNING, "Clipping level %d, increase qscale\n", level);
77  }
78  put_bits_le(pb, 8, level & 0xFF);
79  }
80 }
81 
82 static inline void asv1_encode_block(ASVEncContext *a, int16_t block[64])
83 {
84  int i;
85  int nc_count = 0;
86 
87  put_bits(&a->pb, 8, (block[0] + 32) >> 6);
88  block[0] = 0;
89 
90  for (i = 0; i < 10; i++) {
91  const int index = ff_asv_scantab[4 * i];
92  int ccp = 0;
93 
94  if ((block[index + 0] = (block[index + 0] *
95  a->q_intra_matrix[index + 0] + (1 << 15)) >> 16))
96  ccp |= 8;
97  if ((block[index + 8] = (block[index + 8] *
98  a->q_intra_matrix[index + 8] + (1 << 15)) >> 16))
99  ccp |= 4;
100  if ((block[index + 1] = (block[index + 1] *
101  a->q_intra_matrix[index + 1] + (1 << 15)) >> 16))
102  ccp |= 2;
103  if ((block[index + 9] = (block[index + 9] *
104  a->q_intra_matrix[index + 9] + (1 << 15)) >> 16))
105  ccp |= 1;
106 
107  if (ccp) {
108  for (; nc_count; nc_count--)
109  put_bits(&a->pb, 2, 2); /* Skip */
110 
111  put_bits(&a->pb, ff_asv_ccp_tab[ccp][1], ff_asv_ccp_tab[ccp][0]);
112 
113  if (ccp & 8)
114  asv1_put_level(&a->pb, block[index + 0]);
115  if (ccp & 4)
116  asv1_put_level(&a->pb, block[index + 8]);
117  if (ccp & 2)
118  asv1_put_level(&a->pb, block[index + 1]);
119  if (ccp & 1)
120  asv1_put_level(&a->pb, block[index + 9]);
121  } else {
122  nc_count++;
123  }
124  }
125  put_bits(&a->pb, 5, 0xF); /* End of block */
126 }
127 
128 static inline void asv2_encode_block(ASVEncContext *a, int16_t block[64])
129 {
130  int i;
131  int count = 0;
132 
133  for (count = 63; count > 3; count--) {
134  const int index = ff_asv_scantab[count];
135  if ((block[index] * a->q_intra_matrix[index] + (1 << 15)) >> 16)
136  break;
137  }
138 
139  count >>= 2;
140 
141  put_bits_le(&a->pb, 4, count);
142  put_bits_le(&a->pb, 8, (block[0] + 32) >> 6);
143  block[0] = 0;
144 
145  for (i = 0; i <= count; i++) {
146  const int index = ff_asv_scantab[4 * i];
147  int ccp = 0;
148 
149  if ((block[index + 0] = (block[index + 0] *
150  a->q_intra_matrix[index + 0] + (1 << 15)) >> 16))
151  ccp |= 8;
152  if ((block[index + 8] = (block[index + 8] *
153  a->q_intra_matrix[index + 8] + (1 << 15)) >> 16))
154  ccp |= 4;
155  if ((block[index + 1] = (block[index + 1] *
156  a->q_intra_matrix[index + 1] + (1 << 15)) >> 16))
157  ccp |= 2;
158  if ((block[index + 9] = (block[index + 9] *
159  a->q_intra_matrix[index + 9] + (1 << 15)) >> 16))
160  ccp |= 1;
161 
162  av_assert2(i || ccp < 8);
163  if (i)
164  put_bits_le(&a->pb, ff_asv_ac_ccp_tab[ccp][1], ff_asv_ac_ccp_tab[ccp][0]);
165  else
166  put_bits_le(&a->pb, ff_asv_dc_ccp_tab[ccp][1], ff_asv_dc_ccp_tab[ccp][0]);
167 
168  if (ccp) {
169  if (ccp & 8)
170  asv2_put_level(a, &a->pb, block[index + 0]);
171  if (ccp & 4)
172  asv2_put_level(a, &a->pb, block[index + 8]);
173  if (ccp & 2)
174  asv2_put_level(a, &a->pb, block[index + 1]);
175  if (ccp & 1)
176  asv2_put_level(a, &a->pb, block[index + 9]);
177  }
178  }
179 }
180 
181 #define MAX_MB_SIZE (30 * 16 * 16 * 3 / 2 / 8)
182 
183 static inline int encode_mb(ASVEncContext *a, int16_t block[6][64])
184 {
185  int i;
186 
187  av_assert0(put_bytes_left(&a->pb, 0) >= MAX_MB_SIZE);
188 
189  if (a->c.avctx->codec_id == AV_CODEC_ID_ASV1) {
190  for (i = 0; i < 6; i++)
192  } else {
193  for (i = 0; i < 6; i++) {
195  }
196  }
197  return 0;
198 }
199 
200 static inline void dct_get(ASVEncContext *a, const AVFrame *frame,
201  int mb_x, int mb_y)
202 {
203  int16_t (*block)[64] = a->block;
204  int linesize = frame->linesize[0];
205  int i;
206 
207  const uint8_t *ptr_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
208  const uint8_t *ptr_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
209  const uint8_t *ptr_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
210 
211  a->pdsp.get_pixels(block[0], ptr_y, linesize);
212  a->pdsp.get_pixels(block[1], ptr_y + 8, linesize);
213  a->pdsp.get_pixels(block[2], ptr_y + 8 * linesize, linesize);
214  a->pdsp.get_pixels(block[3], ptr_y + 8 * linesize + 8, linesize);
215  for (i = 0; i < 4; i++)
216  a->fdsp.fdct(block[i]);
217 
218  if (!(a->c.avctx->flags & AV_CODEC_FLAG_GRAY)) {
219  a->pdsp.get_pixels(block[4], ptr_cb, frame->linesize[1]);
220  a->pdsp.get_pixels(block[5], ptr_cr, frame->linesize[2]);
221  for (i = 4; i < 6; i++)
222  a->fdsp.fdct(block[i]);
223  }
224 }
225 
227  const AVFrame *pict, int *got_packet)
228 {
229  ASVEncContext *const a = avctx->priv_data;
230  const ASVCommonContext *const c = &a->c;
231  int size, ret;
232 
233  if (pict->width % 16 || pict->height % 16) {
234  AVFrame *clone = av_frame_alloc();
235  int i;
236 
237  if (!clone)
238  return AVERROR(ENOMEM);
239  clone->format = pict->format;
240  clone->width = FFALIGN(pict->width, 16);
241  clone->height = FFALIGN(pict->height, 16);
242  ret = av_frame_get_buffer(clone, 0);
243  if (ret < 0) {
244  av_frame_free(&clone);
245  return ret;
246  }
247 
248  ret = av_frame_copy(clone, pict);
249  if (ret < 0) {
250  av_frame_free(&clone);
251  return ret;
252  }
253 
254  for (i = 0; i<3; i++) {
255  int x, y;
256  int w = AV_CEIL_RSHIFT(pict->width, !!i);
257  int h = AV_CEIL_RSHIFT(pict->height, !!i);
258  int w2 = AV_CEIL_RSHIFT(clone->width, !!i);
259  int h2 = AV_CEIL_RSHIFT(clone->height, !!i);
260  for (y=0; y<h; y++)
261  for (x=w; x<w2; x++)
262  clone->data[i][x + y*clone->linesize[i]] =
263  clone->data[i][w - 1 + y*clone->linesize[i]];
264  for (y=h; y<h2; y++)
265  for (x=0; x<w2; x++)
266  clone->data[i][x + y*clone->linesize[i]] =
267  clone->data[i][x + (h-1)*clone->linesize[i]];
268  }
269  ret = encode_frame(avctx, pkt, clone, got_packet);
270 
271  av_frame_free(&clone);
272  return ret;
273  }
274 
275  if ((ret = ff_alloc_packet(avctx, pkt, c->mb_height * c->mb_width * MAX_MB_SIZE +
277  return ret;
278 
279  init_put_bits(&a->pb, pkt->data, pkt->size);
280 
281  for (int mb_y = 0; mb_y < c->mb_height2; mb_y++) {
282  for (int mb_x = 0; mb_x < c->mb_width2; mb_x++) {
283  dct_get(a, pict, mb_x, mb_y);
284  encode_mb(a, a->block);
285  }
286  }
287 
288  if (c->mb_width2 != c->mb_width) {
289  int mb_x = c->mb_width2;
290  for (int mb_y = 0; mb_y < c->mb_height2; mb_y++) {
291  dct_get(a, pict, mb_x, mb_y);
292  encode_mb(a, a->block);
293  }
294  }
295 
296  if (c->mb_height2 != c->mb_height) {
297  int mb_y = c->mb_height2;
298  for (int mb_x = 0; mb_x < c->mb_width; mb_x++) {
299  dct_get(a, pict, mb_x, mb_y);
300  encode_mb(a, a->block);
301  }
302  }
303 
304  if (avctx->codec_id == AV_CODEC_ID_ASV1)
305  flush_put_bits(&a->pb);
306  else
307  flush_put_bits_le(&a->pb);
308  AV_WN32(put_bits_ptr(&a->pb), 0);
309  size = (put_bytes_output(&a->pb) + 3) / 4;
310 
311  if (avctx->codec_id == AV_CODEC_ID_ASV1) {
312  c->bbdsp.bswap_buf((uint32_t *) pkt->data,
313  (uint32_t *) pkt->data, size);
314  }
315 
316  pkt->size = size * 4;
317  *got_packet = 1;
318 
319  return 0;
320 }
321 
323 {
324  ASVEncContext *const a = avctx->priv_data;
325  int i;
326  const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
327  int inv_qscale;
328 
329  ff_asv_common_init(avctx);
330  ff_fdctdsp_init(&a->fdsp, avctx);
331  ff_pixblockdsp_init(&a->pdsp, avctx);
332 
333  if (avctx->global_quality <= 0)
334  avctx->global_quality = 4 * FF_QUALITY_SCALE;
335 
336  inv_qscale = (32 * scale * FF_QUALITY_SCALE +
337  avctx->global_quality / 2) / avctx->global_quality;
338 
339  avctx->extradata = av_mallocz(8);
340  if (!avctx->extradata)
341  return AVERROR(ENOMEM);
342  avctx->extradata_size = 8;
343  AV_WLA(32, avctx->extradata, inv_qscale);
344  ((uint32_t *) avctx->extradata)[1] = av_le2ne32(AV_RL32("ASUS"));
345 
346  for (i = 0; i < 64; i++) {
347  if (a->fdsp.fdct == ff_fdct_ifast) {
348  int q = 32LL * scale * ff_mpeg1_default_intra_matrix[i] * ff_aanscales[i];
349  a->q_intra_matrix[i] = (((int64_t)inv_qscale << 30) + q / 2) / q;
350  } else {
351  int q = 32 * scale * ff_mpeg1_default_intra_matrix[i];
352  a->q_intra_matrix[i] = ((inv_qscale << 16) + q / 2) / q;
353  }
354  }
355 
356  return 0;
357 }
358 
359 #if CONFIG_ASV1_ENCODER
360 const FFCodec ff_asv1_encoder = {
361  .p.name = "asv1",
362  CODEC_LONG_NAME("ASUS V1"),
363  .p.type = AVMEDIA_TYPE_VIDEO,
364  .p.id = AV_CODEC_ID_ASV1,
365  .p.capabilities = AV_CODEC_CAP_DR1,
366  .priv_data_size = sizeof(ASVEncContext),
367  .init = encode_init,
369  .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
370  AV_PIX_FMT_NONE },
371 };
372 #endif
373 
374 #if CONFIG_ASV2_ENCODER
375 const FFCodec ff_asv2_encoder = {
376  .p.name = "asv2",
377  CODEC_LONG_NAME("ASUS V2"),
378  .p.type = AVMEDIA_TYPE_VIDEO,
379  .p.id = AV_CODEC_ID_ASV2,
380  .p.capabilities = AV_CODEC_CAP_DR1,
381  .priv_data_size = sizeof(ASVEncContext),
382  .init = encode_init,
384  .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
385  AV_PIX_FMT_NONE },
386 };
387 #endif
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
ff_asv_dc_ccp_tab
const uint8_t ff_asv_dc_ccp_tab[8][2]
Definition: asv.c:57
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
level
uint8_t level
Definition: svq3.c:204
asv1_put_level
static void asv1_put_level(PutBitContext *pb, int level)
Definition: asvenc.c:54
ff_asv_level_tab
const uint8_t ff_asv_level_tab[7][2]
Definition: asv.c:53
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
mem_internal.h
av_frame_get_buffer
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
Definition: frame.c:259
put_bytes_output
static int put_bytes_output(const PutBitContext *s)
Definition: put_bits.h:89
av_clip_int8
#define av_clip_int8
Definition: common.h:104
AV_WLA
#define AV_WLA(s, p, v)
Definition: intreadwrite.h:550
put_sbits
static void put_sbits(PutBitContext *pb, int n, int32_t value)
Definition: put_bits.h:281
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:62
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:116
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:221
AVFrame::width
int width
Definition: frame.h:397
w
uint8_t w
Definition: llviddspenc.c:38
FF_QUALITY_SCALE
#define FF_QUALITY_SCALE
Definition: avutil.h:230
AVPacket::data
uint8_t * data
Definition: packet.h:374
encode.h
FFCodec
Definition: codec_internal.h:119
ff_pixblockdsp_init
av_cold void ff_pixblockdsp_init(PixblockDSPContext *c, AVCodecContext *avctx)
Definition: pixblockdsp.c:81
ASVEncContext::q_intra_matrix
int q_intra_matrix[64]
Definition: asvenc.c:51
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:346
ff_asv2_level_tab
const uint16_t ff_asv2_level_tab[63][2]
Definition: asv.c:69
ASVEncContext::block
int16_t block[6][64]
Definition: asvenc.c:50
FDCTDSPContext
Definition: fdctdsp.h:26
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:123
asv1_encode_block
static void asv1_encode_block(ASVEncContext *a, int16_t block[64])
Definition: asvenc.c:82
ff_asv_scantab
const uint8_t ff_asv_scantab[64]
Definition: asv.c:34
scale
static av_always_inline float scale(float x, float s)
Definition: vf_v360.c:1389
asv2_encode_block
static void asv2_encode_block(ASVEncContext *a, int16_t block[64])
Definition: asvenc.c:128
FF_CODEC_ENCODE_CB
#define FF_CODEC_ENCODE_CB(func)
Definition: codec_internal.h:307
put_bytes_left
static int put_bytes_left(const PutBitContext *s, int round_up)
Definition: put_bits.h:135
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:104
ASVCommonContext
Definition: asv.h:34
encode_init
static av_cold int encode_init(AVCodecContext *avctx)
Definition: asvenc.c:322
pkt
AVPacket * pkt
Definition: movenc.c:59
ff_asv2_encoder
const FFCodec ff_asv2_encoder
av_cold
#define av_cold
Definition: attributes.h:90
dct.h
ff_fdctdsp_init
av_cold void ff_fdctdsp_init(FDCTDSPContext *c, AVCodecContext *avctx)
Definition: fdctdsp.c:26
ff_asv1_encoder
const FFCodec ff_asv1_encoder
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:500
AVCodecContext::global_quality
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:464
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:50
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts_bsf.c:363
encode_mb
static int encode_mb(ASVEncContext *a, int16_t block[6][64])
Definition: asvenc.c:183
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
asv.h
AV_INPUT_BUFFER_MIN_SIZE
#define AV_INPUT_BUFFER_MIN_SIZE
Definition: avcodec.h:191
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:66
PutBitContext
Definition: put_bits.h:50
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#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:264
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enum AVCodecID codec_id
Definition: avcodec.h:408
ff_asv_ac_ccp_tab
const uint8_t ff_asv_ac_ccp_tab[16][2]
Definition: asv.c:62
PixblockDSPContext
Definition: pixblockdsp.h:28
aandcttab.h
ff_fdct_ifast
void ff_fdct_ifast(int16_t *data)
Definition: jfdctfst.c:207
flush_put_bits_le
static void flush_put_bits_le(PutBitContext *s)
Definition: put_bits.h:164
index
int index
Definition: gxfenc.c:89
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
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
AV_CODEC_FLAG_GRAY
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:259
AVPacket::size
int size
Definition: packet.h:375
codec_internal.h
AV_WN32
#define AV_WN32(p, v)
Definition: intreadwrite.h:376
av_frame_copy
int av_frame_copy(AVFrame *dst, const AVFrame *src)
Copy the frame data from src to dst.
Definition: frame.c:771
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
size
int size
Definition: twinvq_data.h:10344
AVFrame::format
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:412
ff_mpeg1_default_intra_matrix
const uint16_t ff_mpeg1_default_intra_matrix[256]
Definition: mpeg12data.c:31
ff_asv_common_init
av_cold void ff_asv_common_init(AVCodecContext *avctx)
Definition: asv.c:91
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
attributes.h
AV_CODEC_ID_ASV1
@ AV_CODEC_ID_ASV1
Definition: codec_id.h:83
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:116
ASVEncContext::fdsp
FDCTDSPContext fdsp
Definition: asvenc.c:49
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:499
AV_CODEC_ID_ASV2
@ AV_CODEC_ID_ASV2
Definition: codec_id.h:84
av_le2ne32
#define av_le2ne32(x)
Definition: bswap.h:98
fdctdsp.h
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:264
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:211
ASVEncContext::c
ASVCommonContext c
Definition: asvenc.c:44
encode_frame
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: asvenc.c:226
avcodec.h
ret
ret
Definition: filter_design.txt:187
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:264
ASVEncContext
Definition: asvenc.c:43
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
mpeg12data.h
AVCodecContext
main external API structure.
Definition: avcodec.h:398
AVFrame::height
int height
Definition: frame.h:397
put_bits_ptr
static uint8_t * put_bits_ptr(PutBitContext *s)
Return the pointer to the byte where the bitstream writer will put the next bit.
Definition: put_bits.h:370
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:143
ff_asv_ccp_tab
const uint8_t ff_asv_ccp_tab[17][2]
Definition: asv.c:45
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
AVPacket
This structure stores compressed data.
Definition: packet.h:351
MAX_MB_SIZE
#define MAX_MB_SIZE
Definition: asvenc.c:181
dct_get
static void dct_get(ASVEncContext *a, const AVFrame *frame, int mb_x, int mb_y)
Definition: asvenc.c:200
ASVEncContext::pb
PutBitContext pb
Definition: asvenc.c:46
ASVEncContext::pdsp
PixblockDSPContext pdsp
Definition: asvenc.c:48
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:370
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
put_bits_le
static void put_bits_le(PutBitContext *s, int n, BitBuf value)
Definition: put_bits.h:253
h
h
Definition: vp9dsp_template.c:2038
asv2_put_level
static void asv2_put_level(ASVEncContext *a, PutBitContext *pb, int level)
Definition: asvenc.c:66
put_bits.h
ff_alloc_packet
int ff_alloc_packet(AVCodecContext *avctx, AVPacket *avpkt, int64_t size)
Check AVPacket size and allocate data.
Definition: encode.c:35
pixblockdsp.h
ff_aanscales
const uint16_t ff_aanscales[64]
Definition: aandcttab.c:26