FFmpeg
eamad.c
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1 /*
2  * Electronic Arts Madcow Video Decoder
3  * Copyright (c) 2007-2009 Peter Ross
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 St, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Electronic Arts Madcow Video Decoder
25  * @author Peter Ross <pross@xvid.org>
26  *
27  * @see technical details at
28  * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_MAD
29  */
30 
31 #include "libavutil/mem.h"
32 #include "libavutil/mem_internal.h"
33 
34 #include "avcodec.h"
35 #include "blockdsp.h"
36 #include "bytestream.h"
37 #include "bswapdsp.h"
38 #include "codec_internal.h"
39 #include "decode.h"
40 #include "get_bits.h"
41 #include "aandcttab.h"
42 #include "eaidct.h"
43 #include "mpeg12data.h"
44 #include "mpeg12vlc.h"
45 
46 #define EA_PREAMBLE_SIZE 8
47 #define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD I-frame */
48 #define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD P-frame */
49 #define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
50 
51 typedef struct MadContext {
58  unsigned int bitstream_buf_size;
59  DECLARE_ALIGNED(32, int16_t, block)[64];
60  uint16_t quant_matrix[64];
61  int mb_x;
62  int mb_y;
63 } MadContext;
64 
66 {
67  MadContext *s = avctx->priv_data;
68  s->avctx = avctx;
69  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
70  ff_blockdsp_init(&s->bdsp);
71  ff_bswapdsp_init(&s->bbdsp);
73 
74  s->last_frame = av_frame_alloc();
75  if (!s->last_frame)
76  return AVERROR(ENOMEM);
77 
78  return 0;
79 }
80 
81 static inline void comp(unsigned char *dst, ptrdiff_t dst_stride,
82  unsigned char *src, ptrdiff_t src_stride, int add)
83 {
84  int j, i;
85  for (j=0; j<8; j++)
86  for (i=0; i<8; i++)
87  dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
88 }
89 
90 static inline void comp_block(MadContext *t, AVFrame *frame,
91  int mb_x, int mb_y,
92  int j, int mv_x, int mv_y, int add)
93 {
94  if (j < 4) {
95  unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x;
96  if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7)
97  return;
98  comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
99  frame->linesize[0],
100  t->last_frame->data[0] + offset,
101  t->last_frame->linesize[0], add);
102  } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
103  int index = j - 3;
104  unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2);
105  if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7)
106  return;
107  comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
108  frame->linesize[index],
109  t->last_frame->data[index] + offset,
110  t->last_frame->linesize[index], add);
111  }
112 }
113 
114 static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
115  int mb_x, int mb_y, int j)
116 {
117  if (j < 4) {
119  frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
120  frame->linesize[0], block);
121  } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
122  int index = j - 3;
124  frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
125  frame->linesize[index], block);
126  }
127 }
128 
129 static inline int decode_block_intra(MadContext *s, int16_t * block)
130 {
131  int level, i, j, run;
132  const uint8_t *scantable = ff_zigzag_direct;
133  int16_t *quant_matrix = s->quant_matrix;
134 
135  block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
136 
137  /* The RL decoder is derived from mpeg1_decode_block_intra;
138  Escaped level and run values a decoded differently */
139  i = 0;
140  {
141  OPEN_READER(re, &s->gb);
142  /* now quantify & encode AC coefficients */
143  for (;;) {
144  UPDATE_CACHE(re, &s->gb);
145  GET_RL_VLC(level, run, re, &s->gb, ff_mpeg1_rl_vlc, TEX_VLC_BITS, 2, 0);
146 
147  if (level == 127) {
148  break;
149  } else if (level != 0) {
150  i += run;
151  if (i > 63) {
152  av_log(s->avctx, AV_LOG_ERROR,
153  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
154  return -1;
155  }
156  j = scantable[i];
157  level = (level*quant_matrix[j]) >> 4;
158  level = (level-1)|1;
159  level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
160  LAST_SKIP_BITS(re, &s->gb, 1);
161  } else {
162  /* escape */
163  UPDATE_CACHE(re, &s->gb);
164  level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
165 
166  UPDATE_CACHE(re, &s->gb);
167  run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
168 
169  i += run;
170  if (i > 63) {
171  av_log(s->avctx, AV_LOG_ERROR,
172  "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
173  return -1;
174  }
175  j = scantable[i];
176  if (level < 0) {
177  level = -level;
178  level = (level*quant_matrix[j]) >> 4;
179  level = (level-1)|1;
180  level = -level;
181  } else {
182  level = (level*quant_matrix[j]) >> 4;
183  level = (level-1)|1;
184  }
185  }
186 
187  block[j] = level;
188  }
189  CLOSE_READER(re, &s->gb);
190  }
191  return 0;
192 }
193 
195 {
196  int value = 0;
197  if (get_bits1(gb)) {
198  if (get_bits1(gb))
199  value = -17;
200  value += get_bits(gb, 4) + 1;
201  }
202  return value;
203 }
204 
205 static int decode_mb(MadContext *s, AVFrame *frame, int inter)
206 {
207  int mv_map = 0;
208  int av_uninit(mv_x), av_uninit(mv_y);
209  int j;
210 
211  if (inter) {
212  int v = decode210(&s->gb);
213  if (v < 2) {
214  mv_map = v ? get_bits(&s->gb, 6) : 63;
215  mv_x = decode_motion(&s->gb);
216  mv_y = decode_motion(&s->gb);
217  }
218  }
219 
220  for (j=0; j<6; j++) {
221  if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
222  int add = 2*decode_motion(&s->gb);
223  if (s->last_frame->data[0])
224  comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
225  } else {
226  s->bdsp.clear_block(s->block);
227  if(decode_block_intra(s, s->block) < 0)
228  return -1;
229  idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
230  }
231  }
232  return 0;
233 }
234 
235 static void calc_quant_matrix(MadContext *s, int qscale)
236 {
237  int i;
238 
239  s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
240  for (i=1; i<64; i++)
241  s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
242 }
243 
245  int *got_frame, AVPacket *avpkt)
246 {
247  const uint8_t *buf = avpkt->data;
248  int buf_size = avpkt->size;
249  MadContext *s = avctx->priv_data;
250  GetByteContext gb;
251  int width, height;
252  int chunk_type;
253  int inter, ret;
254 
255  bytestream2_init(&gb, buf, buf_size);
256 
257  chunk_type = bytestream2_get_le32(&gb);
258  inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
259  bytestream2_skip(&gb, 10);
260 
261  av_reduce(&avctx->framerate.den, &avctx->framerate.num,
262  bytestream2_get_le16(&gb), 1000, 1<<30);
263 
264  width = bytestream2_get_le16(&gb);
265  height = bytestream2_get_le16(&gb);
266  bytestream2_skip(&gb, 1);
267  calc_quant_matrix(s, bytestream2_get_byte(&gb));
268  bytestream2_skip(&gb, 2);
269 
270  if (bytestream2_get_bytes_left(&gb) < 2) {
271  av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
272  return AVERROR_INVALIDDATA;
273  }
274 
275  if (width < 16 || height < 16) {
276  av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n");
277  return AVERROR_INVALIDDATA;
278  }
279 
280  if (avctx->width != width || avctx->height != height) {
281  av_frame_unref(s->last_frame);
282  if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb))
283  return AVERROR_INVALIDDATA;
284  if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
285  return ret;
286  }
287 
288  if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
289  return ret;
290 
291  if (inter && !s->last_frame->data[0]) {
292  av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
293  ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
294  if (ret < 0)
295  return ret;
296  memset(s->last_frame->data[0], 0, s->last_frame->height *
297  s->last_frame->linesize[0]);
298  memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
299  s->last_frame->linesize[1]);
300  memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
301  s->last_frame->linesize[2]);
302  }
303 
304  av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
306  if (!s->bitstream_buf)
307  return AVERROR(ENOMEM);
308  s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
309  bytestream2_get_bytes_left(&gb) / 2);
310  memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE);
311  init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb)));
312 
313  for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
314  for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
315  if(decode_mb(s, frame, inter) < 0)
316  return AVERROR_INVALIDDATA;
317 
318  *got_frame = 1;
319 
320  if (chunk_type != MADe_TAG) {
321  if ((ret = av_frame_replace(s->last_frame, frame)) < 0)
322  return ret;
323  }
324 
325  return buf_size;
326 }
327 
329 {
330  MadContext *t = avctx->priv_data;
332  av_freep(&t->bitstream_buf);
333  return 0;
334 }
335 
337  .p.name = "eamad",
338  CODEC_LONG_NAME("Electronic Arts Madcow Video"),
339  .p.type = AVMEDIA_TYPE_VIDEO,
340  .p.id = AV_CODEC_ID_MAD,
341  .priv_data_size = sizeof(MadContext),
342  .init = decode_init,
343  .close = decode_end,
345  .p.capabilities = AV_CODEC_CAP_DR1,
346 };
bswapdsp.h
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
level
uint8_t level
Definition: svq3.c:205
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
mem_internal.h
comp
static void comp(unsigned char *dst, ptrdiff_t dst_stride, unsigned char *src, ptrdiff_t src_stride, int add)
Definition: eamad.c:81
GetByteContext
Definition: bytestream.h:33
MadContext::bitstream_buf_size
unsigned int bitstream_buf_size
Definition: eamad.c:58
decode210
static int BS_FUNC() decode210(BSCTX *bc)
Return decoded truncated unary code for the values 2, 1, 0.
Definition: bitstream_template.h:447
decode_mb
static int decode_mb(MadContext *s, AVFrame *frame, int inter)
Definition: eamad.c:205
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
AVPacket::data
uint8_t * data
Definition: packet.h:524
FFCodec
Definition: codec_internal.h:126
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:225
BlockDSPContext
Definition: blockdsp.h:32
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:94
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:514
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
AV_CODEC_ID_MAD
@ AV_CODEC_ID_MAD
Definition: codec_id.h:181
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:560
bytestream2_skip
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
MadContext::bdsp
BlockDSPContext bdsp
Definition: eamad.c:53
GetBitContext
Definition: get_bits.h:108
mpeg12vlc.h
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:502
ff_ea_idct_put_c
void ff_ea_idct_put_c(uint8_t *dest, ptrdiff_t linesize, int16_t *block)
Definition: eaidct.c:80
av_reduce
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
AVRational::num
int num
Numerator.
Definition: rational.h:59
MadContext
Definition: eamad.c:51
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:148
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
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:188
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
ff_blockdsp_init
av_cold void ff_blockdsp_init(BlockDSPContext *c)
Definition: blockdsp.c:58
s
#define s(width, name)
Definition: cbs_vp9.c:198
AV_GET_BUFFER_FLAG_REF
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:425
SHOW_SBITS
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:260
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:320
decode.h
get_bits.h
SKIP_BITS
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:241
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
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
ff_bswapdsp_init
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
run
uint8_t run
Definition: svq3.c:204
aandcttab.h
MadContext::avctx
AVCodecContext * avctx
Definition: eamad.c:52
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:388
ff_eamad_decoder
const FFCodec ff_eamad_decoder
Definition: eamad.c:336
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:247
ff_mpeg1_rl_vlc
RL_VLC_ELEM ff_mpeg1_rl_vlc[680]
Definition: mpeg12.c:128
index
int index
Definition: gxfenc.c:90
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
bytestream2_tell
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:192
MADe_TAG
#define MADe_TAG
Definition: eamad.c:49
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1575
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:525
calc_quant_matrix
static void calc_quant_matrix(MadContext *s, int qscale)
Definition: eamad.c:235
codec_internal.h
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem_internal.h:109
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: eamad.c:328
MadContext::block
int16_t block[64]
Definition: eamad.c:59
ff_mpeg1_default_intra_matrix
const uint16_t ff_mpeg1_default_intra_matrix[256]
Definition: mpeg12data.c:31
MadContext::bbdsp
BswapDSPContext bbdsp
Definition: eamad.c:54
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:177
height
#define height
offset
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 offset
Definition: writing_filters.txt:86
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
decode_block_intra
static int decode_block_intra(MadContext *s, int16_t *block)
Definition: eamad.c:129
MadContext::gb
GetBitContext gb
Definition: eamad.c:56
MadContext::bitstream_buf
void * bitstream_buf
Definition: eamad.c:57
ff_mpeg12_init_vlcs
av_cold void ff_mpeg12_init_vlcs(void)
Definition: mpeg12.c:164
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:52
value
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
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:606
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::height
int height
Definition: avcodec.h:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
avcodec.h
GET_RL_VLC
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)
Definition: get_bits.h:606
ff_zigzag_direct
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
av_uninit
#define av_uninit(x)
Definition: attributes.h:154
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
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: eamad.c:65
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dvdec.c:147
ff_inv_aanscales
const uint16_t ff_inv_aanscales[64]
Definition: aandcttab.c:38
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
comp_block
static void comp_block(MadContext *t, AVFrame *frame, int mb_x, int mb_y, int j, int mv_x, int mv_y, int add)
Definition: eamad.c:90
mpeg12data.h
av_frame_replace
int av_frame_replace(AVFrame *dst, const AVFrame *src)
Ensure the destination frame refers to the same data described by the source frame,...
Definition: frame.c:483
AVCodecContext
main external API structure.
Definition: avcodec.h:445
MadContext::last_frame
AVFrame * last_frame
Definition: eamad.c:55
MadContext::mb_y
int mb_y
Definition: eamad.c:62
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:259
AVRational::den
int den
Denominator.
Definition: rational.h:60
idct_put
static void idct_put(MadContext *t, AVFrame *frame, int16_t *block, int mb_x, int mb_y, int j)
Definition: eamad.c:114
MadContext::mb_x
int mb_x
Definition: eamad.c:61
MADm_TAG
#define MADm_TAG
Definition: eamad.c:48
av_clip_uint8
#define av_clip_uint8
Definition: common.h:105
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
AVPacket
This structure stores compressed data.
Definition: packet.h:501
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
decode_frame
static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: eamad.c:244
decode_motion
static int decode_motion(GetBitContext *gb)
Definition: eamad.c:194
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:618
bytestream.h
eaidct.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
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
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
BswapDSPContext
Definition: bswapdsp.h:24
MadContext::quant_matrix
uint16_t quant_matrix[64]
Definition: eamad.c:60