rv30.c
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1 /*
2  * RV30 decoder
3  * Copyright (c) 2007 Konstantin Shishkov
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
27 #include "avcodec.h"
28 #include "dsputil.h"
29 #include "mpegvideo.h"
30 #include "golomb.h"
31 
32 #include "rv34.h"
33 #include "rv30data.h"
34 
35 
37 {
38  int mb_bits;
39  int w = r->s.width, h = r->s.height;
40  int mb_size;
41  int rpr;
42 
43  memset(si, 0, sizeof(SliceInfo));
44  if(get_bits(gb, 3))
45  return -1;
46  si->type = get_bits(gb, 2);
47  if(si->type == 1) si->type = 0;
48  if(get_bits1(gb))
49  return -1;
50  si->quant = get_bits(gb, 5);
51  skip_bits1(gb);
52  si->pts = get_bits(gb, 13);
53  rpr = get_bits(gb, r->rpr);
54  if(rpr){
55  w = r->s.avctx->extradata[6 + rpr*2] << 2;
56  h = r->s.avctx->extradata[7 + rpr*2] << 2;
57  }
58  si->width = w;
59  si->height = h;
60  mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
61  mb_bits = ff_rv34_get_start_offset(gb, mb_size);
62  si->start = get_bits(gb, mb_bits);
63  skip_bits1(gb);
64  return 0;
65 }
66 
70 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
71 {
72  int i, j, k;
73 
74  for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
75  for(j = 0; j < 4; j+= 2){
76  int code = svq3_get_ue_golomb(gb) << 1;
77  if(code >= 81*2){
78  av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
79  return -1;
80  }
81  for(k = 0; k < 2; k++){
82  int A = dst[-r->intra_types_stride] + 1;
83  int B = dst[-1] + 1;
84  *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
85  if(dst[-1] == 9){
86  av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
87  return -1;
88  }
89  }
90  }
91  }
92  return 0;
93 }
94 
99 {
100  static const int rv30_p_types[6] = { RV34_MB_SKIP, RV34_MB_P_16x16, RV34_MB_P_8x8, -1, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };
102  MpegEncContext *s = &r->s;
103  GetBitContext *gb = &s->gb;
104  int code = svq3_get_ue_golomb(gb);
105 
106  if(code > 11){
107  av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
108  return -1;
109  }
110  if(code > 5){
111  av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
112  code -= 6;
113  }
114  if(s->pict_type != AV_PICTURE_TYPE_B)
115  return rv30_p_types[code];
116  else
117  return rv30_b_types[code];
118 }
119 
120 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
121  const int stride, const int lim)
122 {
123  uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
124  int i, diff;
125 
126  for(i = 0; i < 4; i++){
127  diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
128  diff = av_clip(diff, -lim, lim);
129  src[-1*step] = cm[src[-1*step] + diff];
130  src[ 0*step] = cm[src[ 0*step] - diff];
131  src += stride;
132  }
133 }
134 
135 static void rv30_loop_filter(RV34DecContext *r, int row)
136 {
137  MpegEncContext *s = &r->s;
138  int mb_pos, mb_x;
139  int i, j, k;
140  uint8_t *Y, *C;
141  int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
142 
143  mb_pos = row * s->mb_stride;
144  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
145  int mbtype = s->current_picture_ptr->f.mb_type[mb_pos];
146  if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
147  r->deblock_coefs[mb_pos] = 0xFFFF;
148  if(IS_INTRA(mbtype))
149  r->cbp_chroma[mb_pos] = 0xFF;
150  }
151 
152  /* all vertical edges are filtered first
153  * and horizontal edges are filtered on the next iteration
154  */
155  mb_pos = row * s->mb_stride;
156  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
157  cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos]];
158  if(mb_x)
159  left_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos - 1]];
160  for(j = 0; j < 16; j += 4){
161  Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
162  for(i = !mb_x; i < 4; i++, Y += 4){
163  int ij = i + j;
164  loc_lim = 0;
165  if(r->deblock_coefs[mb_pos] & (1 << ij))
166  loc_lim = cur_lim;
167  else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
168  loc_lim = left_lim;
169  else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
170  loc_lim = cur_lim;
171  if(loc_lim)
172  rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
173  }
174  }
175  for(k = 0; k < 2; k++){
176  int cur_cbp, left_cbp = 0;
177  cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
178  if(mb_x)
179  left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
180  for(j = 0; j < 8; j += 4){
181  C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
182  for(i = !mb_x; i < 2; i++, C += 4){
183  int ij = i + (j >> 1);
184  loc_lim = 0;
185  if(cur_cbp && (1 << ij))
186  loc_lim = cur_lim;
187  else if(!i && left_cbp & (1 << (ij + 1)))
188  loc_lim = left_lim;
189  else if( i && cur_cbp & (1 << (ij - 1)))
190  loc_lim = cur_lim;
191  if(loc_lim)
192  rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
193  }
194  }
195  }
196  }
197  mb_pos = row * s->mb_stride;
198  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
199  cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos]];
200  if(row)
201  top_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos - s->mb_stride]];
202  for(j = 4*!row; j < 16; j += 4){
203  Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;
204  for(i = 0; i < 4; i++, Y += 4){
205  int ij = i + j;
206  loc_lim = 0;
207  if(r->deblock_coefs[mb_pos] & (1 << ij))
208  loc_lim = cur_lim;
209  else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
210  loc_lim = top_lim;
211  else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
212  loc_lim = cur_lim;
213  if(loc_lim)
214  rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
215  }
216  }
217  for(k = 0; k < 2; k++){
218  int cur_cbp, top_cbp = 0;
219  cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
220  if(row)
221  top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
222  for(j = 4*!row; j < 8; j += 4){
223  C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
224  for(i = 0; i < 2; i++, C += 4){
225  int ij = i + (j >> 1);
226  loc_lim = 0;
227  if(r->cbp_chroma[mb_pos] && (1 << ij))
228  loc_lim = cur_lim;
229  else if(!j && top_cbp & (1 << (ij + 2)))
230  loc_lim = top_lim;
231  else if( j && cur_cbp & (1 << (ij - 2)))
232  loc_lim = cur_lim;
233  if(loc_lim)
234  rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
235  }
236  }
237  }
238  }
239 }
240 
245 {
246  RV34DecContext *r = avctx->priv_data;
247  int ret;
248 
249  r->rv30 = 1;
250  if ((ret = ff_rv34_decode_init(avctx)) < 0)
251  return ret;
252  if(avctx->extradata_size < 2){
253  av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
254  return -1;
255  }
256  r->rpr = (avctx->extradata[1] & 7) >> 1;
257  r->rpr = FFMIN(r->rpr + 1, 3);
258  if(avctx->extradata_size - 8 < (r->rpr - 1) * 2){
259  av_log(avctx, AV_LOG_ERROR, "Insufficient extradata - need at least %d bytes, got %d\n",
260  6 + r->rpr * 2, avctx->extradata_size);
261  return AVERROR(EINVAL);
262  }
269  return 0;
270 }
271 
273  .name = "rv30",
274  .type = AVMEDIA_TYPE_VIDEO,
275  .id = CODEC_ID_RV30,
276  .priv_data_size = sizeof(RV34DecContext),
281  .flush = ff_mpeg_flush,
282  .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
283  .pix_fmts = ff_pixfmt_list_420,
286 };
static const uint8_t rv30_luma_dc_quant[32]
DC quantizer mapping for RV30.
Definition: rv30data.h:33
#define ff_cropTbl
int(* decode_intra_types)(struct RV34DecContext *r, GetBitContext *gb, int8_t *dst)
Definition: rv34.h:125
void(* loop_filter)(struct RV34DecContext *r, int row)
Definition: rv34.h:126
#define B
Definition: dsputil.c:1975
#define IS_SEPARATE_DC(a)
Definition: rv34.h:38
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:237
B-frame macroblock, forward prediction.
Definition: rv34.h:48
#define CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:788
MpegEncContext s
Definition: rv34.h:86
static const uint8_t rv30_loop_filt_lim[32]
Loop filter limits are taken from this table.
Definition: rv30data.h:178
Definition: vf_drawbox.c:32
int height
coded height
Definition: rv34.h:80
#define MAX_NEG_CROP
Definition: dsputil.h:86
Bidirectionally predicted B-frame macroblock, no motion vectors.
Definition: rv34.h:51
AVCodec ff_rv30_decoder
Definition: rv30.c:272
int * deblock_coefs
deblock coefficients for each macroblock
Definition: rv34.h:113
mpegvideo header.
static av_cold int rv30_decode_init(AVCodecContext *avctx)
Initialize decoder.
Definition: rv30.c:244
RV30 and RV40 decoder common data declarations.
int start
Definition: rv34.h:78
int stride
Definition: mace.c:143
AVCodec.
Definition: avcodec.h:3189
const uint8_t * luma_dc_quant_p
luma subblock DC quantizer for interframes
Definition: rv34.h:92
static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
Decode 4x4 intra types array.
Definition: rv30.c:70
Definition: vf_drawbox.c:32
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:228
#define av_cold
Definition: attributes.h:71
int width
coded width
Definition: rv34.h:79
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1387
static int rv30_decode_mb_info(RV34DecContext *r)
Decode macroblock information.
Definition: rv30.c:98
Skipped block.
Definition: rv34.h:50
enum PixelFormat ff_pixfmt_list_420[]
Definition: mpegvideo.c:130
#define cm
Definition: dvbsubdec.c:34
static int init(AVCodecParserContext *s)
Definition: h264_parser.c:336
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:719
int quant
quantizer used for this slice
Definition: rv34.h:76
int(* parse_slice_header)(struct RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
Definition: rv34.h:123
static const uint8_t rv30_itype_from_context[900]
This table is used for retrieving the current intra type based on its neighbors and adjustment provid...
Definition: rv30data.h:63
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:191
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:140
const char * name
Name of the codec implementation.
Definition: avcodec.h:3196
#define IS_INTRA(a)
Definition: mpegvideo.h:99
GetBitContext gb
Definition: mpegvideo.h:603
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2640
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:231
Intra macroblock with DCs in a separate 4x4 block.
Definition: rv34.h:45
#define FFMIN(a, b)
Definition: common.h:55
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:299
static const uint8_t rv30_itype_code[9 *9 *2]
This table is used for storing the differences between the predicted and the real intra type...
Definition: rv30data.h:42
uint32_t * mb_type
macroblock type table mb_type_base + mb_width + 2
Definition: avcodec.h:1117
int ff_rv34_decode_init_thread_copy(AVCodecContext *avctx)
Definition: rv34.c:1532
essential slice information
Definition: rv34.h:74
external API header
static void rv30_loop_filter(RV34DecContext *r, int row)
Definition: rv30.c:135
static int svq3_get_ue_golomb(GetBitContext *gb)
Definition: golomb.h:110
main external API structure.
Definition: avcodec.h:1329
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:327
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:205
static void rv30_weak_loop_filter(uint8_t *src, const int step, const int stride, const int lim)
Definition: rv30.c:120
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:111
int extradata_size
Definition: avcodec.h:1388
P-frame macroblock, 8x8 motion compensation partitions.
Definition: rv34.h:47
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:268
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:293
av_cold int ff_rv34_decode_init(AVCodecContext *avctx)
Initialize decoder.
Definition: rv34.c:1488
int ff_rv34_decode_frame(AVCodecContext *avctx, void *data, int *got_picture_ptr, AVPacket *avpkt)
Definition: rv34.c:1611
static int step
Definition: avplay.c:244
int intra_types_stride
block types array stride
Definition: rv34.h:90
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:331
P-frame macroblock, one motion frame.
Definition: rv34.h:46
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: avcodec.h:997
int8_t * qscale_table
QP table.
Definition: avcodec.h:1081
MpegEncContext.
Definition: mpegvideo.h:201
av_cold int ff_rv34_decode_end(AVCodecContext *avctx)
Definition: rv34.c:1800
struct AVCodecContext * avctx
Definition: mpegvideo.h:203
int(* decode_mb_info)(struct RV34DecContext *r)
Definition: rv34.h:124
#define r(n)
Definition: regs.h:32
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:238
static av_cold void flush(AVCodecContext *avctx)
Flush (reset) the frame ID after seeking.
Definition: alsdec.c:1779
B-frame macroblock, backward prediction.
Definition: rv34.h:49
int ff_rv34_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: rv34.c:1549
Bi-dir predicted.
Definition: avutil.h:298
int ff_rv34_get_start_offset(GetBitContext *gb, int mb_size)
Decode starting slice position.
Definition: rv34.c:333
DSP utils.
decoder context
Definition: rv34.h:85
void * priv_data
Definition: avcodec.h:1531
static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
Definition: rv30.c:36
int linesize
line size, in bytes, may be different from width
Definition: mpegvideo.h:243
const uint8_t * luma_dc_quant_i
luma subblock DC quantizer for intraframes
Definition: rv34.h:91
struct AVFrame f
Definition: mpegvideo.h:86
int rpr
one field size in RV30 slice header
Definition: rv34.h:106
int type
slice type (intra, inter)
Definition: rv34.h:75
#define CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:750
miscellaneous RV30 tables
int rv30
indicates which RV variasnt is currently decoded
Definition: rv34.h:105
exp golomb vlc stuff
int uvlinesize
line size, for chroma in bytes, may be different from width
Definition: mpegvideo.h:244
Intra macroblock.
Definition: rv34.h:44
struct RV34DecContext RV34DecContext
decoder context
int pts
frame timestamp
Definition: rv34.h:81
uint8_t * cbp_chroma
CBP values for chroma subblocks.
Definition: rv34.h:112