Libav
asvdec.c
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1 /*
2  * Copyright (c) 2003 Michael Niedermayer
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
26 #include "libavutil/attributes.h"
27 #include "libavutil/mem.h"
28 
29 #include "asv.h"
30 #include "avcodec.h"
31 #include "put_bits.h"
32 #include "internal.h"
33 #include "mathops.h"
34 #include "mpeg12data.h"
35 
36 #define VLC_BITS 6
37 #define ASV2_LEVEL_VLC_BITS 10
38 
39 static VLC ccp_vlc;
40 static VLC level_vlc;
41 static VLC dc_ccp_vlc;
42 static VLC ac_ccp_vlc;
44 
46 {
47  static int done = 0;
48 
49  if (!done) {
50  done = 1;
51 
52  INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
53  &ff_asv_ccp_tab[0][1], 2, 1,
54  &ff_asv_ccp_tab[0][0], 2, 1, 64);
55  INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
56  &ff_asv_dc_ccp_tab[0][1], 2, 1,
57  &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
58  INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
59  &ff_asv_ac_ccp_tab[0][1], 2, 1,
60  &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
61  INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
62  &ff_asv_level_tab[0][1], 2, 1,
63  &ff_asv_level_tab[0][0], 2, 1, 64);
64  INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
65  &ff_asv2_level_tab[0][1], 2, 1,
66  &ff_asv2_level_tab[0][0], 2, 1, 1024);
67  }
68 }
69 
70 //FIXME write a reversed bitstream reader to avoid the double reverse
71 static inline int asv2_get_bits(GetBitContext *gb, int n)
72 {
73  return ff_reverse[get_bits(gb, n) << (8-n)];
74 }
75 
76 static inline int asv1_get_level(GetBitContext *gb)
77 {
78  int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
79 
80  if (code == 3)
81  return get_sbits(gb, 8);
82  else
83  return code - 3;
84 }
85 
86 static inline int asv2_get_level(GetBitContext *gb)
87 {
88  int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
89 
90  if (code == 31)
91  return (int8_t)asv2_get_bits(gb, 8);
92  else
93  return code - 31;
94 }
95 
96 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
97 {
98  int i;
99 
100  block[0] = 8 * get_bits(&a->gb, 8);
101 
102  for (i = 0; i < 11; i++) {
103  const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
104 
105  if (ccp) {
106  if (ccp == 16)
107  break;
108  if (ccp < 0 || i >= 10) {
109  av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
110  return AVERROR_INVALIDDATA;
111  }
112 
113  if (ccp & 8)
114  block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
115  if (ccp & 4)
116  block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
117  if (ccp & 2)
118  block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
119  if (ccp & 1)
120  block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
121  }
122  }
123 
124  return 0;
125 }
126 
127 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
128 {
129  int i, count, ccp;
130 
131  count = asv2_get_bits(&a->gb, 4);
132 
133  block[0] = 8 * asv2_get_bits(&a->gb, 8);
134 
135  ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
136  if (ccp) {
137  if (ccp & 4)
138  block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
139  if (ccp & 2)
140  block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
141  if (ccp & 1)
142  block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
143  }
144 
145  for (i = 1; i < count + 1; i++) {
146  const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
147 
148  if (ccp) {
149  if (ccp & 8)
150  block[a->scantable.permutated[4*i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 0]) >> 4;
151  if (ccp & 4)
152  block[a->scantable.permutated[4*i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 1]) >> 4;
153  if (ccp & 2)
154  block[a->scantable.permutated[4*i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 2]) >> 4;
155  if (ccp & 1)
156  block[a->scantable.permutated[4*i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 3]) >> 4;
157  }
158  }
159 
160  return 0;
161 }
162 
163 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
164 {
165  int i;
166 
167  a->dsp.clear_blocks(block[0]);
168 
169  if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
170  for (i = 0; i < 6; i++) {
171  if (asv1_decode_block(a, block[i]) < 0)
172  return -1;
173  }
174  } else {
175  for (i = 0; i < 6; i++) {
176  if (asv2_decode_block(a, block[i]) < 0)
177  return -1;
178  }
179  }
180  return 0;
181 }
182 
183 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
184 {
185  int16_t (*block)[64] = a->block;
186  int linesize = frame->linesize[0];
187 
188  uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16;
189  uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
190  uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
191 
192  a->dsp.idct_put(dest_y , linesize, block[0]);
193  a->dsp.idct_put(dest_y + 8, linesize, block[1]);
194  a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
195  a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
196 
197  if (!(a->avctx->flags&CODEC_FLAG_GRAY)) {
198  a->dsp.idct_put(dest_cb, frame->linesize[1], block[4]);
199  a->dsp.idct_put(dest_cr, frame->linesize[2], block[5]);
200  }
201 }
202 
203 static int decode_frame(AVCodecContext *avctx,
204  void *data, int *got_frame,
205  AVPacket *avpkt)
206 {
207  ASV1Context * const a = avctx->priv_data;
208  const uint8_t *buf = avpkt->data;
209  int buf_size = avpkt->size;
210  AVFrame * const p = data;
211  int mb_x, mb_y, ret;
212 
213  if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
214  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
215  return ret;
216  }
218  p->key_frame = 1;
219 
221  buf_size);
222  if (!a->bitstream_buffer)
223  return AVERROR(ENOMEM);
224 
225  if (avctx->codec_id == AV_CODEC_ID_ASV1)
226  a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
227  else {
228  int i;
229  for (i = 0; i < buf_size; i++)
230  a->bitstream_buffer[i] = ff_reverse[buf[i]];
231  }
232 
233  init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
234 
235  for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
236  for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
237  if ((ret = decode_mb(a, a->block)) < 0)
238  return ret;
239 
240  idct_put(a, p, mb_x, mb_y);
241  }
242  }
243 
244  if (a->mb_width2 != a->mb_width) {
245  mb_x = a->mb_width2;
246  for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
247  if ((ret = decode_mb(a, a->block)) < 0)
248  return ret;
249 
250  idct_put(a, p, mb_x, mb_y);
251  }
252  }
253 
254  if (a->mb_height2 != a->mb_height) {
255  mb_y = a->mb_height2;
256  for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
257  if ((ret = decode_mb(a, a->block)) < 0)
258  return ret;
259 
260  idct_put(a, p, mb_x, mb_y);
261  }
262  }
263 
264  *got_frame = 1;
265 
266  emms_c();
267 
268  return (get_bits_count(&a->gb) + 31) / 32 * 4;
269 }
270 
272 {
273  ASV1Context * const a = avctx->priv_data;
274  const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
275  int i;
276 
277  if (avctx->extradata_size < 1) {
278  av_log(avctx, AV_LOG_ERROR, "No extradata provided\n");
279  return AVERROR_INVALIDDATA;
280  }
281 
282  ff_asv_common_init(avctx);
283  init_vlcs(a);
285  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
286 
287  a->inv_qscale = avctx->extradata[0];
288  if (a->inv_qscale == 0) {
289  av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
290  if (avctx->codec_id == AV_CODEC_ID_ASV1)
291  a->inv_qscale = 6;
292  else
293  a->inv_qscale = 10;
294  }
295 
296  for (i = 0; i < 64; i++) {
297  int index = ff_asv_scantab[i];
298 
299  a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
300  }
301 
302  return 0;
303 }
304 
306 {
307  ASV1Context * const a = avctx->priv_data;
308 
310  a->bitstream_buffer_size = 0;
311 
312  return 0;
313 }
314 
316  .name = "asv1",
317  .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
318  .type = AVMEDIA_TYPE_VIDEO,
319  .id = AV_CODEC_ID_ASV1,
320  .priv_data_size = sizeof(ASV1Context),
321  .init = decode_init,
322  .close = decode_end,
323  .decode = decode_frame,
324  .capabilities = CODEC_CAP_DR1,
325 };
326 
328  .name = "asv2",
329  .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
330  .type = AVMEDIA_TYPE_VIDEO,
331  .id = AV_CODEC_ID_ASV2,
332  .priv_data_size = sizeof(ASV1Context),
333  .init = decode_init,
334  .close = decode_end,
335  .decode = decode_frame,
336  .capabilities = CODEC_CAP_DR1,
337 };
338 
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: asvdec.c:203
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
This structure describes decoded (raw) audio or video data.
Definition: frame.h:107
const uint8_t ff_asv_ac_ccp_tab[16][2]
Definition: asv.c:59
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:240
memory handling functions
int16_t block[6][64]
Definition: asv.h:49
int size
Definition: avcodec.h:974
AVCodecContext * avctx
Definition: asv.h:39
#define VLC_BITS
Definition: asvdec.c:36
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1247
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer with padding, reusing the given one if large enough.
Definition: utils.c:70
uint8_t permutated[64]
Definition: dsputil.h:113
static int asv2_decode_block(ASV1Context *a, int16_t block[64])
Definition: asvdec.c:127
unsigned int bitstream_buffer_size
Definition: asv.h:53
AVCodec.
Definition: avcodec.h:2755
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:226
Macro definitions for various function/variable attributes.
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:269
void(* idct_put)(uint8_t *dest, int line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
Definition: dsputil.h:220
const uint8_t ff_asv2_level_tab[63][2]
Definition: asv.c:66
static av_cold int decode_init(AVCodecContext *avctx)
Definition: asvdec.c:271
uint8_t
#define av_cold
Definition: attributes.h:66
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:443
uint8_t * bitstream_buffer
Definition: asv.h:52
static VLC asv2_level_vlc
Definition: asvdec.c:43
#define emms_c()
Definition: internal.h:46
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1162
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:711
const char data[16]
Definition: mxf.c:66
const uint8_t ff_asv_ccp_tab[17][2]
Definition: asv.c:42
static int asv2_get_level(GetBitContext *gb)
Definition: asvdec.c:86
uint8_t * data
Definition: avcodec.h:973
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
uint8_t idct_permutation[64]
idct input permutation.
Definition: dsputil.h:240
const uint8_t ff_asv_dc_ccp_tab[8][2]
Definition: asv.c:54
int mb_height2
Definition: asv.h:48
const uint16_t ff_mpeg1_default_intra_matrix[64]
Definition: mpeg12data.c:30
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: dsputil.h:202
#define AVERROR(e)
Definition: error.h:43
av_cold void ff_asv_common_init(AVCodecContext *avctx)
Definition: asv.c:82
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:142
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1142
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
const char * name
Name of the codec implementation.
Definition: avcodec.h:2762
#define ASV2_LEVEL_VLC_BITS
Definition: asvdec.c:37
uint16_t intra_matrix[64]
Definition: asv.h:50
AVCodec ff_asv2_decoder
Definition: asvdec.c:327
ASUS V1/V2 encoder/decoder common data.
Definition: get_bits.h:64
ScanTable scantable
Definition: asv.h:43
static int asv2_get_bits(GetBitContext *gb, int n)
Definition: asvdec.c:71
GetBitContext gb
Definition: asv.h:42
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:168
void(* clear_blocks)(int16_t *blocks)
Definition: dsputil.h:143
static VLC level_vlc
Definition: asvdec.c:40
static int decode_mb(ASV1Context *a, int16_t block[6][64])
Definition: asvdec.c:163
static VLC ccp_vlc
Definition: asvdec.c:39
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:522
int mb_width
Definition: asv.h:45
Libavcodec external API header.
static VLC ac_ccp_vlc
Definition: asvdec.c:42
enum AVCodecID codec_id
Definition: avcodec.h:1065
DSPContext dsp
Definition: asv.h:40
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:125
AVCodec ff_asv1_decoder
Definition: asvdec.c:315
main external API structure.
Definition: avcodec.h:1054
static VLC dc_ccp_vlc
Definition: asvdec.c:41
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:489
MPEG1/2 tables.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:575
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: dsputil.c:107
int extradata_size
Definition: avcodec.h:1163
int index
Definition: gxfenc.c:72
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:375
int mb_width2
Definition: asv.h:47
static void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
Definition: asvdec.c:183
static const uint16_t scale[4]
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:113
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
int inv_qscale
Definition: asv.h:44
common internal api header.
#define CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:670
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:498
void * priv_data
Definition: avcodec.h:1090
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:66
static av_cold void init_vlcs(ASV1Context *a)
Definition: asvdec.c:45
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:163
static int asv1_get_level(GetBitContext *gb)
Definition: asvdec.c:76
const uint8_t ff_reverse[256]
Definition: mathtables.c:70
static int asv1_decode_block(ASV1Context *a, int16_t block[64])
Definition: asvdec.c:96
const uint8_t ff_asv_scantab[64]
Definition: asv.c:31
static av_cold int decode_end(AVCodecContext *avctx)
Definition: asvdec.c:305
const uint8_t ff_asv_level_tab[7][2]
Definition: asv.c:50
This structure stores compressed data.
Definition: avcodec.h:950
int mb_height
Definition: asv.h:46
bitstream writer API
static int16_t block[64]
Definition: dct-test.c:170