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 "encode.h"
37 #include "fdctdsp.h"
38 #include "mpeg12data.h"
39 #include "pixblockdsp.h"
40 #include "put_bits.h"
41 
42 typedef struct ASVEncContext {
44 
46 
49  DECLARE_ALIGNED(32, int16_t, block)[6][64];
50  int q_intra_matrix[64];
52 
53 static inline void asv1_put_level(PutBitContext *pb, int level)
54 {
55  unsigned int index = level + 3;
56 
57  if (index <= 6) {
59  } else {
60  put_bits(pb, 3, 0); /* Escape code */
61  put_sbits(pb, 8, level);
62  }
63 }
64 
65 static inline void asv2_put_level(ASVEncContext *a, PutBitContext *pb, int level)
66 {
67  unsigned int index = level + 31;
68 
69  if (index <= 62) {
71  } else {
72  put_bits_le(pb, 5, 0); /* Escape code */
73  if (level < -128 || level > 127) {
74  av_log(a->c.avctx, AV_LOG_WARNING, "Clipping level %d, increase qscale\n", level);
76  }
77  put_bits_le(pb, 8, level & 0xFF);
78  }
79 }
80 
81 static inline void asv1_encode_block(ASVEncContext *a, int16_t block[64])
82 {
83  int i;
84  int nc_count = 0;
85 
86  put_bits(&a->pb, 8, (block[0] + 32) >> 6);
87  block[0] = 0;
88 
89  for (i = 0; i < 10; i++) {
90  const int index = ff_asv_scantab[4 * i];
91  int ccp = 0;
92 
93  if ((block[index + 0] = (block[index + 0] *
94  a->q_intra_matrix[index + 0] + (1 << 15)) >> 16))
95  ccp |= 8;
96  if ((block[index + 8] = (block[index + 8] *
97  a->q_intra_matrix[index + 8] + (1 << 15)) >> 16))
98  ccp |= 4;
99  if ((block[index + 1] = (block[index + 1] *
100  a->q_intra_matrix[index + 1] + (1 << 15)) >> 16))
101  ccp |= 2;
102  if ((block[index + 9] = (block[index + 9] *
103  a->q_intra_matrix[index + 9] + (1 << 15)) >> 16))
104  ccp |= 1;
105 
106  if (ccp) {
107  for (; nc_count; nc_count--)
108  put_bits(&a->pb, 2, 2); /* Skip */
109 
110  put_bits(&a->pb, ff_asv_ccp_tab[ccp][1], ff_asv_ccp_tab[ccp][0]);
111 
112  if (ccp & 8)
113  asv1_put_level(&a->pb, block[index + 0]);
114  if (ccp & 4)
115  asv1_put_level(&a->pb, block[index + 8]);
116  if (ccp & 2)
117  asv1_put_level(&a->pb, block[index + 1]);
118  if (ccp & 1)
119  asv1_put_level(&a->pb, block[index + 9]);
120  } else {
121  nc_count++;
122  }
123  }
124  put_bits(&a->pb, 5, 0xF); /* End of block */
125 }
126 
127 static inline void asv2_encode_block(ASVEncContext *a, int16_t block[64])
128 {
129  int i;
130  int count = 0;
131 
132  for (count = 63; count > 3; count--) {
133  const int index = ff_asv_scantab[count];
134  if ((block[index] * a->q_intra_matrix[index] + (1 << 15)) >> 16)
135  break;
136  }
137 
138  count >>= 2;
139 
140  put_bits_le(&a->pb, 4, count);
141  put_bits_le(&a->pb, 8, (block[0] + 32) >> 6);
142  block[0] = 0;
143 
144  for (i = 0; i <= count; i++) {
145  const int index = ff_asv_scantab[4 * i];
146  int ccp = 0;
147 
148  if ((block[index + 0] = (block[index + 0] *
149  a->q_intra_matrix[index + 0] + (1 << 15)) >> 16))
150  ccp |= 8;
151  if ((block[index + 8] = (block[index + 8] *
152  a->q_intra_matrix[index + 8] + (1 << 15)) >> 16))
153  ccp |= 4;
154  if ((block[index + 1] = (block[index + 1] *
155  a->q_intra_matrix[index + 1] + (1 << 15)) >> 16))
156  ccp |= 2;
157  if ((block[index + 9] = (block[index + 9] *
158  a->q_intra_matrix[index + 9] + (1 << 15)) >> 16))
159  ccp |= 1;
160 
161  av_assert2(i || ccp < 8);
162  if (i)
163  put_bits_le(&a->pb, ff_asv_ac_ccp_tab[ccp][1], ff_asv_ac_ccp_tab[ccp][0]);
164  else
165  put_bits_le(&a->pb, ff_asv_dc_ccp_tab[ccp][1], ff_asv_dc_ccp_tab[ccp][0]);
166 
167  if (ccp) {
168  if (ccp & 8)
169  asv2_put_level(a, &a->pb, block[index + 0]);
170  if (ccp & 4)
171  asv2_put_level(a, &a->pb, block[index + 8]);
172  if (ccp & 2)
173  asv2_put_level(a, &a->pb, block[index + 1]);
174  if (ccp & 1)
175  asv2_put_level(a, &a->pb, block[index + 9]);
176  }
177  }
178 }
179 
180 #define MAX_MB_SIZE (30 * 16 * 16 * 3 / 2 / 8)
181 
182 static inline int encode_mb(ASVEncContext *a, int16_t block[6][64])
183 {
184  int i;
185 
186  av_assert0(put_bytes_left(&a->pb, 0) >= MAX_MB_SIZE);
187 
188  if (a->c.avctx->codec_id == AV_CODEC_ID_ASV1) {
189  for (i = 0; i < 6; i++)
191  } else {
192  for (i = 0; i < 6; i++) {
194  }
195  }
196  return 0;
197 }
198 
199 static inline void dct_get(ASVEncContext *a, const AVFrame *frame,
200  int mb_x, int mb_y)
201 {
202  int16_t (*block)[64] = a->block;
203  int linesize = frame->linesize[0];
204  int i;
205 
206  const uint8_t *ptr_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
207  const uint8_t *ptr_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
208  const uint8_t *ptr_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
209 
210  a->pdsp.get_pixels(block[0], ptr_y, linesize);
211  a->pdsp.get_pixels(block[1], ptr_y + 8, linesize);
212  a->pdsp.get_pixels(block[2], ptr_y + 8 * linesize, linesize);
213  a->pdsp.get_pixels(block[3], ptr_y + 8 * linesize + 8, linesize);
214  for (i = 0; i < 4; i++)
215  a->fdsp.fdct(block[i]);
216 
217  if (!(a->c.avctx->flags & AV_CODEC_FLAG_GRAY)) {
218  a->pdsp.get_pixels(block[4], ptr_cb, frame->linesize[1]);
219  a->pdsp.get_pixels(block[5], ptr_cr, frame->linesize[2]);
220  for (i = 4; i < 6; i++)
221  a->fdsp.fdct(block[i]);
222  }
223 }
224 
226  const AVFrame *pict, int *got_packet)
227 {
228  ASVEncContext *const a = avctx->priv_data;
229  const ASVCommonContext *const c = &a->c;
230  int size, ret;
231 
232  if (pict->width % 16 || pict->height % 16) {
233  AVFrame *clone = av_frame_alloc();
234  int i;
235 
236  if (!clone)
237  return AVERROR(ENOMEM);
238  clone->format = pict->format;
239  clone->width = FFALIGN(pict->width, 16);
240  clone->height = FFALIGN(pict->height, 16);
241  ret = av_frame_get_buffer(clone, 0);
242  if (ret < 0) {
243  av_frame_free(&clone);
244  return ret;
245  }
246 
247  ret = av_frame_copy(clone, pict);
248  if (ret < 0) {
249  av_frame_free(&clone);
250  return ret;
251  }
252 
253  for (i = 0; i<3; i++) {
254  int x, y;
255  int w = AV_CEIL_RSHIFT(pict->width, !!i);
256  int h = AV_CEIL_RSHIFT(pict->height, !!i);
257  int w2 = AV_CEIL_RSHIFT(clone->width, !!i);
258  int h2 = AV_CEIL_RSHIFT(clone->height, !!i);
259  for (y=0; y<h; y++)
260  for (x=w; x<w2; x++)
261  clone->data[i][x + y*clone->linesize[i]] =
262  clone->data[i][w - 1 + y*clone->linesize[i]];
263  for (y=h; y<h2; y++)
264  for (x=0; x<w2; x++)
265  clone->data[i][x + y*clone->linesize[i]] =
266  clone->data[i][x + (h-1)*clone->linesize[i]];
267  }
268  ret = encode_frame(avctx, pkt, clone, got_packet);
269 
270  av_frame_free(&clone);
271  return ret;
272  }
273 
274  if ((ret = ff_alloc_packet(avctx, pkt, c->mb_height * c->mb_width * MAX_MB_SIZE +
276  return ret;
277 
278  init_put_bits(&a->pb, pkt->data, pkt->size);
279 
280  for (int mb_y = 0; mb_y < c->mb_height2; mb_y++) {
281  for (int mb_x = 0; mb_x < c->mb_width2; mb_x++) {
282  dct_get(a, pict, mb_x, mb_y);
283  encode_mb(a, a->block);
284  }
285  }
286 
287  if (c->mb_width2 != c->mb_width) {
288  int mb_x = c->mb_width2;
289  for (int mb_y = 0; mb_y < c->mb_height2; mb_y++) {
290  dct_get(a, pict, mb_x, mb_y);
291  encode_mb(a, a->block);
292  }
293  }
294 
295  if (c->mb_height2 != c->mb_height) {
296  int mb_y = c->mb_height2;
297  for (int mb_x = 0; mb_x < c->mb_width; mb_x++) {
298  dct_get(a, pict, mb_x, mb_y);
299  encode_mb(a, a->block);
300  }
301  }
302 
303  if (avctx->codec_id == AV_CODEC_ID_ASV1)
304  flush_put_bits(&a->pb);
305  else
306  flush_put_bits_le(&a->pb);
307  AV_WN32(put_bits_ptr(&a->pb), 0);
308  size = (put_bytes_output(&a->pb) + 3) / 4;
309 
310  if (avctx->codec_id == AV_CODEC_ID_ASV1) {
311  c->bbdsp.bswap_buf((uint32_t *) pkt->data,
312  (uint32_t *) pkt->data, size);
313  }
314 
315  pkt->size = size * 4;
316  *got_packet = 1;
317 
318  return 0;
319 }
320 
322 {
323  ASVEncContext *const a = avctx->priv_data;
324  int i;
325  const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
326  int inv_qscale;
327 
328  ff_asv_common_init(avctx);
329  ff_fdctdsp_init(&a->fdsp, avctx);
330  ff_pixblockdsp_init(&a->pdsp, avctx);
331 
332  if (avctx->global_quality <= 0)
333  avctx->global_quality = 4 * FF_QUALITY_SCALE;
334 
335  inv_qscale = (32 * scale * FF_QUALITY_SCALE +
336  avctx->global_quality / 2) / avctx->global_quality;
337 
338  avctx->extradata = av_mallocz(8);
339  if (!avctx->extradata)
340  return AVERROR(ENOMEM);
341  avctx->extradata_size = 8;
342  AV_WLA(32, avctx->extradata, inv_qscale);
343  ((uint32_t *) avctx->extradata)[1] = av_le2ne32(AV_RL32("ASUS"));
344 
345  for (i = 0; i < 64; i++) {
346  if (a->fdsp.fdct == ff_fdct_ifast) {
347  int q = 32LL * scale * ff_mpeg1_default_intra_matrix[i] * ff_aanscales[i];
348  a->q_intra_matrix[i] = (((int64_t)inv_qscale << 30) + q / 2) / q;
349  } else {
350  int q = 32 * scale * ff_mpeg1_default_intra_matrix[i];
351  a->q_intra_matrix[i] = ((inv_qscale << 16) + q / 2) / q;
352  }
353  }
354 
355  return 0;
356 }
357 
358 #if CONFIG_ASV1_ENCODER
359 const FFCodec ff_asv1_encoder = {
360  .p.name = "asv1",
361  CODEC_LONG_NAME("ASUS V1"),
362  .p.type = AVMEDIA_TYPE_VIDEO,
363  .p.id = AV_CODEC_ID_ASV1,
365  .priv_data_size = sizeof(ASVEncContext),
366  .init = encode_init,
368  .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
369  AV_PIX_FMT_NONE },
370 };
371 #endif
372 
373 #if CONFIG_ASV2_ENCODER
374 const FFCodec ff_asv2_encoder = {
375  .p.name = "asv2",
376  CODEC_LONG_NAME("ASUS V2"),
377  .p.type = AVMEDIA_TYPE_VIDEO,
378  .p.id = AV_CODEC_ID_ASV2,
380  .priv_data_size = sizeof(ASVEncContext),
381  .init = encode_init,
383  .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
384  AV_PIX_FMT_NONE },
385 };
386 #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:71
level
uint8_t level
Definition: svq3.c:205
asv1_put_level
static void asv1_put_level(PutBitContext *pb, int level)
Definition: asvenc.c:53
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:288
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:109
AV_WLA
#define AV_WLA(s, p, v)
Definition: intreadwrite.h:546
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:160
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:223
AVFrame::width
int width
Definition: frame.h:446
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:520
encode.h
FFCodec
Definition: codec_internal.h:126
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:50
FF_INPUT_BUFFER_MIN_SIZE
#define FF_INPUT_BUFFER_MIN_SIZE
Used by some encoders as upper bound for the length of headers.
Definition: encode.h:33
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
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:49
FDCTDSPContext
Definition: fdctdsp.h:28
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
asv1_encode_block
static void asv1_encode_block(ASVEncContext *a, int16_t block[64])
Definition: asvenc.c:81
ff_asv_scantab
const uint8_t ff_asv_scantab[64]
Definition: asv.c:34
asv2_encode_block
static void asv2_encode_block(ASVEncContext *a, int16_t block[64])
Definition: asvenc.c:127
FF_CODEC_ENCODE_CB
#define FF_CODEC_ENCODE_CB(func)
Definition: codec_internal.h:295
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:148
ASVCommonContext
Definition: asv.h:34
encode_init
static av_cold int encode_init(AVCodecContext *avctx)
Definition: asvenc.c:321
pkt
AVPacket * pkt
Definition: movenc.c:60
ff_asv2_encoder
const FFCodec ff_asv2_encoder
av_cold
#define av_cold
Definition: attributes.h:90
ff_asv1_encoder
const FFCodec ff_asv1_encoder
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:524
AVCodecContext::global_quality
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:1239
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:60
AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE
#define AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE
This encoder can reorder user opaque values from input AVFrames and return them with corresponding ou...
Definition: codec.h:159
encode_mb
static int encode_mb(ASVEncContext *a, int16_t block[6][64])
Definition: asvenc.c:182
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
asv.h
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:73
PutBitContext
Definition: put_bits.h:50
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:455
ff_asv_ac_ccp_tab
const uint8_t ff_asv_ac_ccp_tab[16][2]
Definition: asv.c:62
PixblockDSPContext
Definition: pixblockdsp.h:26
aandcttab.h
flush_put_bits_le
static void flush_put_bits_le(PutBitContext *s)
Definition: put_bits.h:164
index
int index
Definition: gxfenc.c:90
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
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
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:322
AVPacket::size
int size
Definition: packet.h:521
codec_internal.h
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem_internal.h:109
AV_WN32
#define AV_WN32(p, v)
Definition: intreadwrite.h:372
av_frame_copy
int av_frame_copy(AVFrame *dst, const AVFrame *src)
Copy the frame data from src to dst.
Definition: frame.c:999
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:461
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
ASVEncContext::fdsp
FDCTDSPContext fdsp
Definition: asvenc.c:48
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:67
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:523
AV_CODEC_ID_ASV2
@ AV_CODEC_ID_ASV2
Definition: codec_id.h:84
ff_fdctdsp_init
av_cold void ff_fdctdsp_init(FDCTDSPContext *c, AVCodecContext *avctx)
Definition: fdctdsp.c:25
av_le2ne32
#define av_le2ne32(x)
Definition: bswap.h:92
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:256
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
ASVEncContext::c
ASVCommonContext c
Definition: asvenc.c:43
encode_frame
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: asvenc.c:225
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
ff_fdct_ifast
void ff_fdct_ifast(int16_t *data)
Definition: jfdctfst.c:207
ASVEncContext
Definition: asvenc.c:42
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:445
AVFrame::height
int height
Definition: frame.h:446
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:377
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:72
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
scale
static void scale(int *out, const int *in, const int w, const int h, const int shift)
Definition: intra.c:291
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
AVPacket
This structure stores compressed data.
Definition: packet.h:497
MAX_MB_SIZE
#define MAX_MB_SIZE
Definition: asvenc.c:180
dct_get
static void dct_get(ASVEncContext *a, const AVFrame *frame, int mb_x, int mb_y)
Definition: asvenc.c:199
ASVEncContext::pb
PutBitContext pb
Definition: asvenc.c:45
ASVEncContext::pdsp
PixblockDSPContext pdsp
Definition: asvenc.c:47
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:419
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:65
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:62
pixblockdsp.h
ff_aanscales
const uint16_t ff_aanscales[64]
Definition: aandcttab.c:26