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rv30.c
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1 /*
2  * RV30 decoder
3  * Copyright (c) 2007 Konstantin Shishkov
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 Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * RV30 decoder
25  */
26 
27 #include "avcodec.h"
28 #include "mpegutils.h"
29 #include "mpegvideo.h"
30 #include "golomb.h"
31 
32 #include "rv34.h"
33 #include "rv30data.h"
34 
35 
37 {
38  AVCodecContext *avctx = r->s.avctx;
39  int mb_bits;
40  int w = r->s.width, h = r->s.height;
41  int mb_size;
42  int rpr;
43 
44  memset(si, 0, sizeof(SliceInfo));
45  if(get_bits(gb, 3))
46  return -1;
47  si->type = get_bits(gb, 2);
48  if(si->type == 1) si->type = 0;
49  if(get_bits1(gb))
50  return -1;
51  si->quant = get_bits(gb, 5);
52  skip_bits1(gb);
53  si->pts = get_bits(gb, 13);
54  rpr = get_bits(gb, av_log2(r->max_rpr) + 1);
55  if(rpr){
56  if (rpr > r->max_rpr) {
57  av_log(avctx, AV_LOG_ERROR, "rpr too large\n");
58  return AVERROR_INVALIDDATA;
59  }
60 
61  if (avctx->extradata_size < rpr * 2 + 8) {
62  av_log(avctx, AV_LOG_ERROR,
63  "Insufficient extradata - need at least %d bytes, got %d\n",
64  8 + rpr * 2, avctx->extradata_size);
65  return AVERROR(EINVAL);
66  }
67 
68  w = r->s.avctx->extradata[6 + rpr*2] << 2;
69  h = r->s.avctx->extradata[7 + rpr*2] << 2;
70  } else {
71  w = r->orig_width;
72  h = r->orig_height;
73  }
74  si->width = w;
75  si->height = h;
76  mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
77  mb_bits = ff_rv34_get_start_offset(gb, mb_size);
78  si->start = get_bits(gb, mb_bits);
79  skip_bits1(gb);
80  return 0;
81 }
82 
83 /**
84  * Decode 4x4 intra types array.
85  */
86 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
87 {
88  int i, j, k;
89 
90  for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
91  for(j = 0; j < 4; j+= 2){
92  unsigned code = get_interleaved_ue_golomb(gb) << 1;
93  if (code > 80U*2U) {
94  av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
95  return -1;
96  }
97  for(k = 0; k < 2; k++){
98  int A = dst[-r->intra_types_stride] + 1;
99  int B = dst[-1] + 1;
100  *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
101  if(dst[-1] == 9){
102  av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
103  return -1;
104  }
105  }
106  }
107  }
108  return 0;
109 }
110 
111 /**
112  * Decode macroblock information.
113  */
115 {
116  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 };
118  MpegEncContext *s = &r->s;
119  GetBitContext *gb = &s->gb;
120  unsigned code = get_interleaved_ue_golomb(gb);
121 
122  if (code > 11) {
123  av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
124  return -1;
125  }
126  if(code > 5){
127  av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
128  code -= 6;
129  }
130  if(s->pict_type != AV_PICTURE_TYPE_B)
131  return rv30_p_types[code];
132  else
133  return rv30_b_types[code];
134 }
135 
136 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
137  const int stride, const int lim)
138 {
139  const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
140  int i, diff;
141 
142  for(i = 0; i < 4; i++){
143  diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
144  diff = av_clip(diff, -lim, lim);
145  src[-1*step] = cm[src[-1*step] + diff];
146  src[ 0*step] = cm[src[ 0*step] - diff];
147  src += stride;
148  }
149 }
150 
151 static void rv30_loop_filter(RV34DecContext *r, int row)
152 {
153  MpegEncContext *s = &r->s;
154  int mb_pos, mb_x;
155  int i, j, k;
156  uint8_t *Y, *C;
157  int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
158 
159  mb_pos = row * s->mb_stride;
160  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
161  int mbtype = s->current_picture_ptr->mb_type[mb_pos];
162  if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
163  r->deblock_coefs[mb_pos] = 0xFFFF;
164  if(IS_INTRA(mbtype))
165  r->cbp_chroma[mb_pos] = 0xFF;
166  }
167 
168  /* all vertical edges are filtered first
169  * and horizontal edges are filtered on the next iteration
170  */
171  mb_pos = row * s->mb_stride;
172  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
173  cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
174  if(mb_x)
175  left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
176  for(j = 0; j < 16; j += 4){
177  Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
178  for(i = !mb_x; i < 4; i++, Y += 4){
179  int ij = i + j;
180  loc_lim = 0;
181  if(r->deblock_coefs[mb_pos] & (1 << ij))
182  loc_lim = cur_lim;
183  else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
184  loc_lim = left_lim;
185  else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
186  loc_lim = cur_lim;
187  if(loc_lim)
188  rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
189  }
190  }
191  for(k = 0; k < 2; k++){
192  int cur_cbp, left_cbp = 0;
193  cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
194  if(mb_x)
195  left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
196  for(j = 0; j < 8; j += 4){
197  C = s->current_picture_ptr->f->data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
198  for(i = !mb_x; i < 2; i++, C += 4){
199  int ij = i + (j >> 1);
200  loc_lim = 0;
201  if (cur_cbp & (1 << ij))
202  loc_lim = cur_lim;
203  else if(!i && left_cbp & (1 << (ij + 1)))
204  loc_lim = left_lim;
205  else if( i && cur_cbp & (1 << (ij - 1)))
206  loc_lim = cur_lim;
207  if(loc_lim)
208  rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
209  }
210  }
211  }
212  }
213  mb_pos = row * s->mb_stride;
214  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
215  cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
216  if(row)
217  top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
218  for(j = 4*!row; j < 16; j += 4){
219  Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
220  for(i = 0; i < 4; i++, Y += 4){
221  int ij = i + j;
222  loc_lim = 0;
223  if(r->deblock_coefs[mb_pos] & (1 << ij))
224  loc_lim = cur_lim;
225  else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
226  loc_lim = top_lim;
227  else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
228  loc_lim = cur_lim;
229  if(loc_lim)
230  rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
231  }
232  }
233  for(k = 0; k < 2; k++){
234  int cur_cbp, top_cbp = 0;
235  cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
236  if(row)
237  top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
238  for(j = 4*!row; j < 8; j += 4){
239  C = s->current_picture_ptr->f->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
240  for(i = 0; i < 2; i++, C += 4){
241  int ij = i + (j >> 1);
242  loc_lim = 0;
243  if (r->cbp_chroma[mb_pos] & (1 << ij))
244  loc_lim = cur_lim;
245  else if(!j && top_cbp & (1 << (ij + 2)))
246  loc_lim = top_lim;
247  else if( j && cur_cbp & (1 << (ij - 2)))
248  loc_lim = cur_lim;
249  if(loc_lim)
250  rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
251  }
252  }
253  }
254  }
255 }
256 
257 /**
258  * Initialize decoder.
259  */
261 {
262  RV34DecContext *r = avctx->priv_data;
263  int ret;
264 
265  r->orig_width = avctx->coded_width;
266  r->orig_height = avctx->coded_height;
267 
268  if (avctx->extradata_size < 2) {
269  av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
270  return AVERROR(EINVAL);
271  }
272  r->rv30 = 1;
273  if ((ret = ff_rv34_decode_init(avctx)) < 0)
274  return ret;
275 
276  r->max_rpr = avctx->extradata[1] & 7;
277  if(avctx->extradata_size < 2*r->max_rpr + 8){
278  av_log(avctx, AV_LOG_WARNING, "Insufficient extradata - need at least %d bytes, got %d\n",
279  2*r->max_rpr + 8, avctx->extradata_size);
280  }
281 
288  return 0;
289 }
290 
292  .name = "rv30",
293  .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
294  .type = AVMEDIA_TYPE_VIDEO,
295  .id = AV_CODEC_ID_RV30,
296  .priv_data_size = sizeof(RV34DecContext),
298  .close = ff_rv34_decode_end,
300  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
302  .flush = ff_mpeg_flush,
303  .pix_fmts = (const enum AVPixelFormat[]) {
306  },
309 };
static const uint8_t rv30_luma_dc_quant[32]
DC quantizer mapping for RV30.
Definition: rv30data.h:33
int orig_width
Definition: rv34.h:112
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int(* decode_intra_types)(struct RV34DecContext *r, GetBitContext *gb, int8_t *dst)
Definition: rv34.h:128
static void flush(AVCodecContext *avctx)
void(* loop_filter)(struct RV34DecContext *r, int row)
Definition: rv34.h:129
#define C
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1877
#define IS_SEPARATE_DC(a)
Definition: rv34.h:37
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:247
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
B-frame macroblock, forward prediction.
Definition: rv34.h:47
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
MpegEncContext s
Definition: rv34.h:85
static const uint8_t rv30_loop_filt_lim[32]
Loop filter limits are taken from this table.
Definition: rv30data.h:178
int height
coded height
Definition: rv34.h:79
Bidirectionally predicted B-frame macroblock, no motion vectors.
Definition: rv34.h:50
int av_log2(unsigned v)
Definition: intmath.c:26
#define MAX_NEG_CROP
Definition: mathops.h:30
AVCodec ff_rv30_decoder
Definition: rv30.c:291
mpegvideo header.
static av_cold int rv30_decode_init(AVCodecContext *avctx)
Initialize decoder.
Definition: rv30.c:260
RV30 and RV40 decoder common data declarations.
int start
Definition: rv34.h:77
AVCodec.
Definition: avcodec.h:3589
const uint8_t * luma_dc_quant_p
luma subblock DC quantizer for interframes
Definition: rv34.h:91
static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
Decode 4x4 intra types array.
Definition: rv30.c:86
#define AV_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:983
uint8_t
#define av_cold
Definition: attributes.h:82
#define Y
Definition: vf_boxblur.c:76
int width
coded width
Definition: rv34.h:78
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1790
Definition: vf_geq.c:46
uint16_t * deblock_coefs
deblock coefficients for each macroblock
Definition: rv34.h:116
int max_rpr
Definition: rv34.h:105
static int rv30_decode_mb_info(RV34DecContext *r)
Decode macroblock information.
Definition: rv30.c:114
Skipped block.
Definition: rv34.h:49
#define A(x)
Definition: vp56_arith.h:28
#define av_log(a,...)
#define cm
Definition: dvbsubdec.c:36
#define U(x)
Definition: vp56_arith.h:37
int quant
quantizer used for this slice
Definition: rv34.h:75
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int(* parse_slice_header)(struct RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
Definition: rv34.h:126
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:176
const char * r
Definition: vf_curves.c:111
const char * name
Name of the codec implementation.
Definition: avcodec.h:3596
GetBitContext gb
Definition: mpegvideo.h:445
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1021
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2771
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:215
Intra macroblock with DCs in a separate 4x4 block.
Definition: rv34.h:44
int orig_height
Definition: rv34.h:112
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:181
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
#define src
Definition: vp9dsp.c:530
int ff_rv34_decode_init_thread_copy(AVCodecContext *avctx)
Definition: rv34.c:1528
essential slice information
Definition: rv34.h:73
Libavcodec external API header.
static void rv30_loop_filter(RV34DecContext *r, int row)
Definition: rv30.c:151
ptrdiff_t linesize
line size, in bytes, may be different from width
Definition: mpegvideo.h:131
main external API structure.
Definition: avcodec.h:1675
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
static void rv30_weak_loop_filter(uint8_t *src, const int step, const int stride, const int lim)
Definition: rv30.c:136
int extradata_size
Definition: avcodec.h:1791
P-frame macroblock, 8x8 motion compensation partitions.
Definition: rv34.h:46
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:324
int coded_height
Definition: avcodec.h:1877
struct AVFrame * f
Definition: mpegpicture.h:46
av_cold int ff_rv34_decode_init(AVCodecContext *avctx)
Initialize decoder.
Definition: rv34.c:1486
ptrdiff_t uvlinesize
line size, for chroma in bytes, may be different from width
Definition: mpegvideo.h:132
int ff_rv34_decode_frame(AVCodecContext *avctx, void *data, int *got_picture_ptr, AVPacket *avpkt)
Definition: rv34.c:1634
int intra_types_stride
block types array stride
Definition: rv34.h:89
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:262
P-frame macroblock, one motion frame.
Definition: rv34.h:45
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
MpegEncContext.
Definition: mpegvideo.h:78
av_cold int ff_rv34_decode_end(AVCodecContext *avctx)
Definition: rv34.c:1844
int8_t * qscale_table
Definition: mpegpicture.h:50
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
int(* decode_mb_info)(struct RV34DecContext *r)
Definition: rv34.h:127
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:750
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:127
B-frame macroblock, backward prediction.
Definition: rv34.h:48
int ff_rv34_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
Definition: rv34.c:1556
Bi-dir predicted.
Definition: avutil.h:270
#define ff_crop_tab
int ff_rv34_get_start_offset(GetBitContext *gb, int mb_size)
Decode starting slice position.
Definition: rv34.c:330
#define IS_INTRA(x, y)
decoder context
Definition: rv34.h:84
void * priv_data
Definition: avcodec.h:1717
static av_always_inline int diff(const uint32_t a, const uint32_t b)
static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
Definition: rv30.c:36
const uint8_t * luma_dc_quant_i
luma subblock DC quantizer for intraframes
Definition: rv34.h:90
uint32_t * mb_type
types and macros are defined in mpegutils.h
Definition: mpegpicture.h:56
int type
slice type (intra, inter)
Definition: rv34.h:74
static unsigned get_interleaved_ue_golomb(GetBitContext *gb)
Definition: golomb.h:115
#define stride
miscellaneous RV30 tables
int rv30
indicates which RV variant is currently decoded
Definition: rv34.h:104
exp golomb vlc stuff
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
Intra macroblock.
Definition: rv34.h:43
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:958
int pts
frame timestamp
Definition: rv34.h:80
uint8_t * cbp_chroma
CBP values for chroma subblocks.
Definition: rv34.h:115