FFmpeg
asvdec.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 decoder.
24  */
25 
26 #include "libavutil/attributes.h"
27 #include "libavutil/mem.h"
28 #include "libavutil/thread.h"
29 
30 #include "asv.h"
31 #include "avcodec.h"
32 #include "blockdsp.h"
33 #include "idctdsp.h"
34 #include "internal.h"
35 #include "mpeg12data.h"
36 
37 #define CCP_VLC_BITS 5
38 #define DC_CCP_VLC_BITS 4
39 #define AC_CCP_VLC_BITS 6
40 #define ASV1_LEVEL_VLC_BITS 4
41 #define ASV2_LEVEL_VLC_BITS 10
42 
43 static VLC ccp_vlc;
44 static VLC level_vlc;
45 static VLC dc_ccp_vlc;
46 static VLC ac_ccp_vlc;
47 static VLC asv2_level_vlc;
48 
49 static av_cold void init_vlcs(void)
50 {
51  INIT_VLC_STATIC(&ccp_vlc, CCP_VLC_BITS, 17,
52  &ff_asv_ccp_tab[0][1], 2, 1,
53  &ff_asv_ccp_tab[0][0], 2, 1, 32);
54  INIT_LE_VLC_STATIC(&dc_ccp_vlc, DC_CCP_VLC_BITS, 8,
55  &ff_asv_dc_ccp_tab[0][1], 2, 1,
56  &ff_asv_dc_ccp_tab[0][0], 2, 1, 16);
57  INIT_LE_VLC_STATIC(&ac_ccp_vlc, AC_CCP_VLC_BITS, 16,
58  &ff_asv_ac_ccp_tab[0][1], 2, 1,
59  &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
60  INIT_VLC_STATIC(&level_vlc, ASV1_LEVEL_VLC_BITS, 7,
61  &ff_asv_level_tab[0][1], 2, 1,
62  &ff_asv_level_tab[0][0], 2, 1, 16);
63  INIT_LE_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
64  &ff_asv2_level_tab[0][1], 4, 2,
65  &ff_asv2_level_tab[0][0], 4, 2, 1024);
66 }
67 
68 static inline int asv1_get_level(GetBitContext *gb)
69 {
70  int code = get_vlc2(gb, level_vlc.table, ASV1_LEVEL_VLC_BITS, 1);
71 
72  if (code == 3)
73  return get_sbits(gb, 8);
74  else
75  return code - 3;
76 }
77 
78 // get_vlc2() is big-endian in this file
79 static inline int asv2_get_vlc2(GetBitContext *gb, VLC_TYPE (*table)[2], int bits)
80 {
81  unsigned int index;
82  int code, n;
83 
84  OPEN_READER(re, gb);
85  UPDATE_CACHE_LE(re, gb);
86 
87  index = SHOW_UBITS_LE(re, gb, bits);
88  code = table[index][0];
89  n = table[index][1];
90  LAST_SKIP_BITS(re, gb, n);
91 
92  CLOSE_READER(re, gb);
93 
94  return code;
95 }
96 
97 static inline int asv2_get_level(GetBitContext *gb)
98 {
99  int code = asv2_get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS);
100 
101  if (code == 31)
102  return (int8_t) get_bits_le(gb, 8);
103  else
104  return code - 31;
105 }
106 
107 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
108 {
109  int i;
110 
111  block[0] = 8 * get_bits(&a->gb, 8);
112 
113  for (i = 0; i < 11; i++) {
114  const int ccp = get_vlc2(&a->gb, ccp_vlc.table, CCP_VLC_BITS, 1);
115 
116  if (ccp) {
117  if (ccp == 16)
118  break;
119  if (ccp < 0 || i >= 10) {
120  av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
121  return AVERROR_INVALIDDATA;
122  }
123 
124  if (ccp & 8)
125  block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
126  if (ccp & 4)
127  block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
128  if (ccp & 2)
129  block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
130  if (ccp & 1)
131  block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
132  }
133  }
134 
135  return 0;
136 }
137 
138 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
139 {
140  int i, count, ccp;
141 
142  count = get_bits_le(&a->gb, 4);
143 
144  block[0] = 8 * get_bits_le(&a->gb, 8);
145 
146  ccp = asv2_get_vlc2(&a->gb, dc_ccp_vlc.table, DC_CCP_VLC_BITS);
147  if (ccp) {
148  if (ccp & 4)
149  block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
150  if (ccp & 2)
151  block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
152  if (ccp & 1)
153  block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
154  }
155 
156  for (i = 1; i < count + 1; i++) {
157  const int ccp = asv2_get_vlc2(&a->gb, ac_ccp_vlc.table, AC_CCP_VLC_BITS);
158 
159  if (ccp) {
160  if (ccp & 8)
161  block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
162  if (ccp & 4)
163  block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
164  if (ccp & 2)
165  block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
166  if (ccp & 1)
167  block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
168  }
169  }
170 
171  return 0;
172 }
173 
174 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
175 {
176  int i, ret;
177 
178  a->bdsp.clear_blocks(block[0]);
179 
180  if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
181  for (i = 0; i < 6; i++) {
182  if ((ret = asv1_decode_block(a, block[i])) < 0)
183  return ret;
184  }
185  } else {
186  for (i = 0; i < 6; i++) {
187  if ((ret = asv2_decode_block(a, block[i])) < 0)
188  return ret;
189  }
190  }
191  return 0;
192 }
193 
194 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
195 {
196  int16_t(*block)[64] = a->block;
197  int linesize = frame->linesize[0];
198 
199  uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
200  uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
201  uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
202 
203  a->idsp.idct_put(dest_y, linesize, block[0]);
204  a->idsp.idct_put(dest_y + 8, linesize, block[1]);
205  a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
206  a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
207 
208  if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
209  a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
210  a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
211  }
212 }
213 
214 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
215  AVPacket *avpkt)
216 {
217  ASV1Context *const a = avctx->priv_data;
218  const uint8_t *buf = avpkt->data;
219  int buf_size = avpkt->size;
220  AVFrame *const p = data;
221  int mb_x, mb_y, ret;
222 
223  if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL)
224  return AVERROR_INVALIDDATA;
225 
226  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
227  return ret;
228  p->pict_type = AV_PICTURE_TYPE_I;
229  p->key_frame = 1;
230 
231  if (avctx->codec_id == AV_CODEC_ID_ASV1) {
232  av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
233  buf_size);
234  if (!a->bitstream_buffer)
235  return AVERROR(ENOMEM);
236 
237  a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
238  (const uint32_t *) buf, buf_size / 4);
239  ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size);
240  } else {
241  ret = init_get_bits8_le(&a->gb, buf, buf_size);
242  }
243  if (ret < 0)
244  return ret;
245 
246  for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
247  for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
248  if ((ret = decode_mb(a, a->block)) < 0)
249  return ret;
250 
251  idct_put(a, p, mb_x, mb_y);
252  }
253  }
254 
255  if (a->mb_width2 != a->mb_width) {
256  mb_x = a->mb_width2;
257  for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
258  if ((ret = decode_mb(a, a->block)) < 0)
259  return ret;
260 
261  idct_put(a, p, mb_x, mb_y);
262  }
263  }
264 
265  if (a->mb_height2 != a->mb_height) {
266  mb_y = a->mb_height2;
267  for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
268  if ((ret = decode_mb(a, a->block)) < 0)
269  return ret;
270 
271  idct_put(a, p, mb_x, mb_y);
272  }
273  }
274 
275  *got_frame = 1;
276 
277  emms_c();
278 
279  return (get_bits_count(&a->gb) + 31) / 32 * 4;
280 }
281 
282 static av_cold int decode_init(AVCodecContext *avctx)
283 {
284  static AVOnce init_static_once = AV_ONCE_INIT;
285  ASV1Context *const a = avctx->priv_data;
286  const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
287  int i;
288 
289  if (avctx->extradata_size < 1) {
290  av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
291  }
292 
293  ff_asv_common_init(avctx);
294  ff_blockdsp_init(&a->bdsp, avctx);
295  ff_idctdsp_init(&a->idsp, avctx);
296  ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);
297  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
298 
299  if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
300  av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
301  if (avctx->codec_id == AV_CODEC_ID_ASV1)
302  a->inv_qscale = 6;
303  else
304  a->inv_qscale = 10;
305  }
306 
307  for (i = 0; i < 64; i++) {
308  int index = ff_asv_scantab[i];
309 
310  a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
311  a->inv_qscale;
312  }
313 
314  ff_thread_once(&init_static_once, init_vlcs);
315 
316  return 0;
317 }
318 
319 static av_cold int decode_end(AVCodecContext *avctx)
320 {
321  ASV1Context *const a = avctx->priv_data;
322 
323  av_freep(&a->bitstream_buffer);
324  a->bitstream_buffer_size = 0;
325 
326  return 0;
327 }
328 
329 #if CONFIG_ASV1_DECODER
330 const AVCodec ff_asv1_decoder = {
331  .name = "asv1",
332  .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
333  .type = AVMEDIA_TYPE_VIDEO,
334  .id = AV_CODEC_ID_ASV1,
335  .priv_data_size = sizeof(ASV1Context),
336  .init = decode_init,
337  .close = decode_end,
338  .decode = decode_frame,
339  .capabilities = AV_CODEC_CAP_DR1,
340  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
341 };
342 #endif
343 
344 #if CONFIG_ASV2_DECODER
345 const AVCodec ff_asv2_decoder = {
346  .name = "asv2",
347  .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
348  .type = AVMEDIA_TYPE_VIDEO,
349  .id = AV_CODEC_ID_ASV2,
350  .priv_data_size = sizeof(ASV1Context),
351  .init = decode_init,
352  .decode = decode_frame,
353  .capabilities = AV_CODEC_CAP_DR1,
354  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
355 };
356 #endif
decode_frame
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: asvdec.c:214
AC_CCP_VLC_BITS
#define AC_CCP_VLC_BITS
Definition: asvdec.c:39
AVCodec
AVCodec.
Definition: codec.h:202
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
dc_ccp_vlc
static VLC dc_ccp_vlc
Definition: asvdec.c:45
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:42
ff_asv_dc_ccp_tab
const uint8_t ff_asv_dc_ccp_tab[8][2]
Definition: asv.c:55
ff_asv2_decoder
const AVCodec ff_asv2_decoder
ff_init_scantable
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
ff_asv1_decoder
const AVCodec ff_asv1_decoder
ff_asv_level_tab
const uint8_t ff_asv_level_tab[7][2]
Definition: asv.c:51
blockdsp.h
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
thread.h
INIT_VLC_STATIC
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:120
ASV2_LEVEL_VLC_BITS
#define ASV2_LEVEL_VLC_BITS
Definition: asvdec.c:41
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:220
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: asvdec.c:282
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:317
index
fg index
Definition: ffmpeg_filter.c:167
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
table
static const uint16_t table[]
Definition: prosumer.c:206
data
const char data[16]
Definition: mxf.c:143
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:798
asv2_get_vlc2
static int asv2_get_vlc2(GetBitContext *gb, VLC_TYPE(*table)[2], int bits)
Definition: asvdec.c:79
init
static int init
Definition: av_tx.c:47
ff_asv2_level_tab
const uint16_t ff_asv2_level_tab[63][2]
Definition: asv.c:67
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:380
VLC_TYPE
#define VLC_TYPE
Definition: vlc.h:24
ff_asv_scantab
const uint8_t ff_asv_scantab[64]
Definition: asv.c:32
GetBitContext
Definition: get_bits.h:62
asv2_get_level
static int asv2_get_level(GetBitContext *gb)
Definition: asvdec.c:97
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:409
ac_ccp_vlc
static VLC ac_ccp_vlc
Definition: asvdec.c:46
scale
static av_always_inline float scale(float x, float s)
Definition: vf_v360.c:1388
asv2_decode_block
static int asv2_decode_block(ASV1Context *a, int16_t block[64])
Definition: asvdec.c:138
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:175
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
ASV1_LEVEL_VLC_BITS
#define ASV1_LEVEL_VLC_BITS
Definition: asvdec.c:40
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:678
ASV1Context
Definition: asv.h:42
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:150
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:485
bits
uint8_t bits
Definition: vp3data.h:141
asv.h
get_bits_le
static unsigned int get_bits_le(GetBitContext *s, int n)
Definition: get_bits.h:421
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:360
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
SHOW_UBITS_LE
#define SHOW_UBITS_LE(name, gb, num)
Definition: get_bits.h:202
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:393
ff_asv_ac_ccp_tab
const uint8_t ff_asv_ac_ccp_tab[16][2]
Definition: asv.c:60
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:173
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
init_vlcs
static av_cold void init_vlcs(void)
Definition: asvdec.c:49
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:200
asv2_level_vlc
static VLC asv2_level_vlc
Definition: asvdec.c:47
AVOnce
#define AVOnce
Definition: thread.h:172
ccp_vlc
static VLC ccp_vlc
Definition: asvdec.c:43
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:414
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1652
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:243
AVPacket::size
int size
Definition: packet.h:374
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
ff_mpeg1_default_intra_matrix
const uint16_t ff_mpeg1_default_intra_matrix[256]
Definition: mpeg12data.c:30
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:139
ff_asv_common_init
av_cold void ff_asv_common_init(AVCodecContext *avctx)
Definition: asv.c:89
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
decode_mb
static int decode_mb(ASV1Context *a, int16_t block[6][64])
Definition: asvdec.c:174
AV_CODEC_ID_ASV1
@ AV_CODEC_ID_ASV1
Definition: codec_id.h:81
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:484
AV_CODEC_ID_ASV2
@ AV_CODEC_ID_ASV2
Definition: codec_id.h:82
av_fast_padded_malloc
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:50
CCP_VLC_BITS
#define CCP_VLC_BITS
Definition: asvdec.c:37
ff_idctdsp_init
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:238
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:209
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:593
DC_CCP_VLC_BITS
#define DC_CCP_VLC_BITS
Definition: asvdec.c:38
idctdsp.h
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
mpeg12data.h
idct_put
static void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
Definition: asvdec.c:194
AVCodecContext
main external API structure.
Definition: avcodec.h:383
level_vlc
static VLC level_vlc
Definition: asvdec.c:44
UPDATE_CACHE_LE
#define UPDATE_CACHE_LE(name, gb)
Definition: get_bits.h:162
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: asvdec.c:319
asv1_decode_block
static int asv1_decode_block(ASV1Context *a, int16_t block[64])
Definition: asvdec.c:107
VLC
Definition: vlc.h:26
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
init_get_bits8_le
static int init_get_bits8_le(GetBitContext *s, const uint8_t *buffer, int byte_size)
Definition: get_bits.h:686
ff_asv_ccp_tab
const uint8_t ff_asv_ccp_tab[17][2]
Definition: asv.c:43
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:410
AVPacket
This structure stores compressed data.
Definition: packet.h:350
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
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:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
ff_blockdsp_init
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:59
asv1_get_level
static int asv1_get_level(GetBitContext *gb)
Definition: asvdec.c:68
INIT_LE_VLC_STATIC
#define INIT_LE_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:123
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
re
float re
Definition: fft.c:78
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