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 "blockdsp.h"
32 #include "put_bits.h"
33 #include "idctdsp.h"
34 #include "internal.h"
35 #include "mathops.h"
36 #include "mpeg12data.h"
37 
38 #define VLC_BITS 6
39 #define ASV2_LEVEL_VLC_BITS 10
40 
41 static VLC ccp_vlc;
42 static VLC level_vlc;
43 static VLC dc_ccp_vlc;
44 static VLC ac_ccp_vlc;
46 
48 {
49  static int done = 0;
50 
51  if (!done) {
52  done = 1;
53 
54  INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
55  &ff_asv_ccp_tab[0][1], 2, 1,
56  &ff_asv_ccp_tab[0][0], 2, 1, 64);
57  INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
58  &ff_asv_dc_ccp_tab[0][1], 2, 1,
59  &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
60  INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
61  &ff_asv_ac_ccp_tab[0][1], 2, 1,
62  &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
63  INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
64  &ff_asv_level_tab[0][1], 2, 1,
65  &ff_asv_level_tab[0][0], 2, 1, 64);
66  INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
67  &ff_asv2_level_tab[0][1], 2, 1,
68  &ff_asv2_level_tab[0][0], 2, 1, 1024);
69  }
70 }
71 
72 //FIXME write a reversed bitstream reader to avoid the double reverse
73 static inline int asv2_get_bits(GetBitContext *gb, int n)
74 {
75  return ff_reverse[get_bits(gb, n) << (8-n)];
76 }
77 
78 static inline int asv1_get_level(GetBitContext *gb)
79 {
80  int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
81 
82  if (code == 3)
83  return get_sbits(gb, 8);
84  else
85  return code - 3;
86 }
87 
88 static inline int asv2_get_level(GetBitContext *gb)
89 {
90  int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
91 
92  if (code == 31)
93  return (int8_t)asv2_get_bits(gb, 8);
94  else
95  return code - 31;
96 }
97 
98 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
99 {
100  int i;
101 
102  block[0] = 8 * get_bits(&a->gb, 8);
103 
104  for (i = 0; i < 11; i++) {
105  const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
106 
107  if (ccp) {
108  if (ccp == 16)
109  break;
110  if (ccp < 0 || i >= 10) {
111  av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
112  return AVERROR_INVALIDDATA;
113  }
114 
115  if (ccp & 8)
116  block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
117  if (ccp & 4)
118  block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
119  if (ccp & 2)
120  block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
121  if (ccp & 1)
122  block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
123  }
124  }
125 
126  return 0;
127 }
128 
129 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
130 {
131  int i, count, ccp;
132 
133  count = asv2_get_bits(&a->gb, 4);
134 
135  block[0] = 8 * asv2_get_bits(&a->gb, 8);
136 
137  ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
138  if (ccp) {
139  if (ccp & 4)
140  block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
141  if (ccp & 2)
142  block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
143  if (ccp & 1)
144  block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
145  }
146 
147  for (i = 1; i < count + 1; i++) {
148  const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
149 
150  if (ccp) {
151  if (ccp & 8)
152  block[a->scantable.permutated[4*i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 0]) >> 4;
153  if (ccp & 4)
154  block[a->scantable.permutated[4*i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 1]) >> 4;
155  if (ccp & 2)
156  block[a->scantable.permutated[4*i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 2]) >> 4;
157  if (ccp & 1)
158  block[a->scantable.permutated[4*i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 3]) >> 4;
159  }
160  }
161 
162  return 0;
163 }
164 
165 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
166 {
167  int i;
168 
169  a->bdsp.clear_blocks(block[0]);
170 
171  if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
172  for (i = 0; i < 6; i++) {
173  if (asv1_decode_block(a, block[i]) < 0)
174  return -1;
175  }
176  } else {
177  for (i = 0; i < 6; i++) {
178  if (asv2_decode_block(a, block[i]) < 0)
179  return -1;
180  }
181  }
182  return 0;
183 }
184 
185 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
186 {
187  int16_t (*block)[64] = a->block;
188  int linesize = frame->linesize[0];
189 
190  uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16;
191  uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
192  uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
193 
194  a->idsp.idct_put(dest_y, linesize, block[0]);
195  a->idsp.idct_put(dest_y + 8, linesize, block[1]);
196  a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
197  a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
198 
199  if (!(a->avctx->flags&CODEC_FLAG_GRAY)) {
200  a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
201  a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
202  }
203 }
204 
205 static int decode_frame(AVCodecContext *avctx,
206  void *data, int *got_frame,
207  AVPacket *avpkt)
208 {
209  ASV1Context * const a = avctx->priv_data;
210  const uint8_t *buf = avpkt->data;
211  int buf_size = avpkt->size;
212  AVFrame * const p = data;
213  int mb_x, mb_y, ret;
214 
215  if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
216  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
217  return ret;
218  }
220  p->key_frame = 1;
221 
223  buf_size);
224  if (!a->bitstream_buffer)
225  return AVERROR(ENOMEM);
226 
227  if (avctx->codec_id == AV_CODEC_ID_ASV1)
228  a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
229  (const uint32_t *) buf, buf_size / 4);
230  else {
231  int i;
232  for (i = 0; i < buf_size; i++)
233  a->bitstream_buffer[i] = ff_reverse[buf[i]];
234  }
235 
236  init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
237 
238  for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
239  for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
240  if ((ret = decode_mb(a, a->block)) < 0)
241  return ret;
242 
243  idct_put(a, p, mb_x, mb_y);
244  }
245  }
246 
247  if (a->mb_width2 != a->mb_width) {
248  mb_x = a->mb_width2;
249  for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
250  if ((ret = decode_mb(a, a->block)) < 0)
251  return ret;
252 
253  idct_put(a, p, mb_x, mb_y);
254  }
255  }
256 
257  if (a->mb_height2 != a->mb_height) {
258  mb_y = a->mb_height2;
259  for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
260  if ((ret = decode_mb(a, a->block)) < 0)
261  return ret;
262 
263  idct_put(a, p, mb_x, mb_y);
264  }
265  }
266 
267  *got_frame = 1;
268 
269  emms_c();
270 
271  return (get_bits_count(&a->gb) + 31) / 32 * 4;
272 }
273 
275 {
276  ASV1Context * const a = avctx->priv_data;
277  const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
278  int i;
279 
280  if (avctx->extradata_size < 1) {
281  av_log(avctx, AV_LOG_ERROR, "No extradata provided\n");
282  return AVERROR_INVALIDDATA;
283  }
284 
285  ff_asv_common_init(avctx);
286  ff_blockdsp_init(&a->bdsp, avctx);
287  ff_idctdsp_init(&a->idsp, avctx);
288  init_vlcs(a);
290  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
291 
292  a->inv_qscale = avctx->extradata[0];
293  if (a->inv_qscale == 0) {
294  av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
295  if (avctx->codec_id == AV_CODEC_ID_ASV1)
296  a->inv_qscale = 6;
297  else
298  a->inv_qscale = 10;
299  }
300 
301  for (i = 0; i < 64; i++) {
302  int index = ff_asv_scantab[i];
303 
304  a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
305  }
306 
307  return 0;
308 }
309 
311 {
312  ASV1Context * const a = avctx->priv_data;
313 
315  a->bitstream_buffer_size = 0;
316 
317  return 0;
318 }
319 
321  .name = "asv1",
322  .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
323  .type = AVMEDIA_TYPE_VIDEO,
324  .id = AV_CODEC_ID_ASV1,
325  .priv_data_size = sizeof(ASV1Context),
326  .init = decode_init,
327  .close = decode_end,
328  .decode = decode_frame,
329  .capabilities = CODEC_CAP_DR1,
330 };
331 
333  .name = "asv2",
334  .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
335  .type = AVMEDIA_TYPE_VIDEO,
336  .id = AV_CODEC_ID_ASV2,
337  .priv_data_size = sizeof(ASV1Context),
338  .init = decode_init,
339  .close = decode_end,
340  .decode = decode_frame,
341  .capabilities = CODEC_CAP_DR1,
342 };
343 
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: asvdec.c:205
#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:135
const uint8_t ff_asv_ac_ccp_tab[16][2]
Definition: asv.c:60
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:57
int size
Definition: avcodec.h:974
AVCodecContext * avctx
Definition: asv.h:43
IDCTDSPContext idsp
Definition: asv.h:47
#define VLC_BITS
Definition: asvdec.c:38
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1254
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:59
uint8_t permutated[64]
Definition: idctdsp.h:31
static int asv2_decode_block(ASV1Context *a, int16_t block[64])
Definition: asvdec.c:129
unsigned int bitstream_buffer_size
Definition: asv.h:61
AVCodec.
Definition: avcodec.h:2796
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:275
const uint8_t ff_asv2_level_tab[63][2]
Definition: asv.c:67
static av_cold int decode_init(AVCodecContext *avctx)
Definition: asvdec.c:274
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:60
static VLC asv2_level_vlc
Definition: asvdec.c:45
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: bswapdsp.h:25
#define emms_c()
Definition: internal.h:47
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1164
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
const char data[16]
Definition: mxf.c:70
const uint8_t ff_asv_ccp_tab[17][2]
Definition: asv.c:43
static int asv2_get_level(GetBitContext *gb)
Definition: asvdec.c:88
uint8_t * data
Definition: avcodec.h:973
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
const uint8_t ff_asv_dc_ccp_tab[8][2]
Definition: asv.c:55
int mb_height2
Definition: asv.h:56
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
BswapDSPContext bbdsp
Definition: asv.h:45
#define AVERROR(e)
Definition: error.h:43
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
av_cold void ff_asv_common_init(AVCodecContext *avctx)
Definition: asv.c:83
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1144
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
const char * name
Name of the codec implementation.
Definition: avcodec.h:2803
#define ASV2_LEVEL_VLC_BITS
Definition: asvdec.c:39
uint16_t intra_matrix[64]
Definition: asv.h:58
AVCodec ff_asv2_decoder
Definition: asvdec.c:332
ASUS V1/V2 encoder/decoder common data.
Definition: get_bits.h:64
ScanTable scantable
Definition: asv.h:51
static int asv2_get_bits(GetBitContext *gb, int n)
Definition: asvdec.c:73
GetBitContext gb
Definition: asv.h:50
void(* idct_put)(uint8_t *dest, int line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:70
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:196
static VLC level_vlc
Definition: asvdec.c:42
static int decode_mb(ASV1Context *a, int16_t block[6][64])
Definition: asvdec.c:165
static VLC ccp_vlc
Definition: asvdec.c:41
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
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
int mb_width
Definition: asv.h:53
Libavcodec external API header.
static VLC ac_ccp_vlc
Definition: asvdec.c:44
enum AVCodecID codec_id
Definition: avcodec.h:1067
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:58
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
AVCodec ff_asv1_decoder
Definition: asvdec.c:320
main external API structure.
Definition: avcodec.h:1050
static VLC dc_ccp_vlc
Definition: asvdec.c:43
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
MPEG1/2 tables.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:612
int extradata_size
Definition: avcodec.h:1165
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:55
static void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
Definition: asvdec.c:185
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
int inv_qscale
Definition: asv.h:52
common internal api header.
#define CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:637
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1092
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:28
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:156
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:66
static av_cold void init_vlcs(ASV1Context *a)
Definition: asvdec.c:47
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:191
static int asv1_get_level(GetBitContext *gb)
Definition: asvdec.c:78
const uint8_t ff_reverse[256]
Definition: mathtables.c:72
static int asv1_decode_block(ASV1Context *a, int16_t block[64])
Definition: asvdec.c:98
const uint8_t ff_asv_scantab[64]
Definition: asv.c:32
static av_cold int decode_end(AVCodecContext *avctx)
Definition: asvdec.c:310
const uint8_t ff_asv_level_tab[7][2]
Definition: asv.c:51
This structure stores compressed data.
Definition: avcodec.h:950
int mb_height
Definition: asv.h:54
BlockDSPContext bdsp
Definition: asv.h:44
bitstream writer API
static int16_t block[64]
Definition: dct-test.c:88