FFmpeg: libavcodec/rv30.c Source File

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libavcodec

rv30.c

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1 /*

2 * RV30 decoder

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 */

22 /**

23 * @file

24 * RV30 decoder

25 */

27 #include "avcodec.h"

28 #include "mpegvideo.h"

29 #include "golomb.h"

31 #include "rv34.h"

32 #include "rv30data.h"

35 static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)

36 {

37 int mb_bits;

38 int w = r->s.width, h = r->s.height;

39 int mb_size;

40 int rpr;

42 memset(si, 0, sizeof(SliceInfo));

43 if(get_bits(gb, 3))

44 return -1;

45 si->type = get_bits(gb, 2);

46 if(si->type == 1) si->type = 0;

47 if(get_bits1(gb))

48 return -1;

49 si->quant = get_bits(gb, 5);

50 skip_bits1(gb);

51 si->pts = get_bits(gb, 13);

52 rpr = get_bits(gb, r->rpr);

53 if (r->s.avctx->extradata_size < 8 + rpr*2) {

54 av_log(r->s.avctx, AV_LOG_WARNING,

55 "Extradata does not contain selected resolution\n");

56 rpr = 0;

57 }

58 if(rpr){

59 w = r->s.avctx->extradata[6 + rpr*2] << 2;

60 h = r->s.avctx->extradata[7 + rpr*2] << 2;

61 }

62 si->width = w;

63 si->height = h;

64 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);

65 mb_bits = ff_rv34_get_start_offset(gb, mb_size);

66 si->start = get_bits(gb, mb_bits);

67 skip_bits1(gb);

68 return 0;

69 }

71 /**

72 * Decode 4x4 intra types array.

73 */

74 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)

75 {

76 int i, j, k;

78 for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){

79 for(j = 0; j < 4; j+= 2){

80 unsigned code = svq3_get_ue_golomb(gb) << 1;

81 if (code > 80U*2U) {

82 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");

83 return -1;

84 }

85 for(k = 0; k < 2; k++){

86 int A = dst[-r->intra_types_stride] + 1;

87 int B = dst[-1] + 1;

88 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];

89 if(dst[-1] == 9){

90 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");

91 return -1;

92 }

93 }

94 }

95 }

96 return 0;

97 }

99 /**

100 * Decode macroblock information.

101 */

102 static int rv30_decode_mb_info(RV34DecContext *r)

103 {

104 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 };

105 static const int rv30_b_types[6] = { RV34_MB_SKIP, RV34_MB_B_DIRECT, RV34_MB_B_FORWARD, RV34_MB_B_BACKWARD, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };

106 MpegEncContext *s = &r->s;

107 GetBitContext *gb = &s->gb;

108 unsigned code = svq3_get_ue_golomb(gb);

109

110 if (code > 11) {

111 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");

112 return -1;

113 }

114 if(code > 5){

115 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");

116 code -= 6;

117 }

118 if(s->pict_type != AV_PICTURE_TYPE_B)

119 return rv30_p_types[code];

120 else

121 return rv30_b_types[code];

122 }

123

124 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,

125 const int stride, const int lim)

126 {

127 const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

128 int i, diff;

129

130 for(i = 0; i < 4; i++){

131 diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;

132 diff = av_clip(diff, -lim, lim);

133 src[-1*step] = cm[src[-1*step] + diff];

134 src[ 0*step] = cm[src[ 0*step] - diff];

135 src += stride;

136 }

137 }

138

139 static void rv30_loop_filter(RV34DecContext *r, int row)

140 {

141 MpegEncContext *s = &r->s;

142 int mb_pos, mb_x;

143 int i, j, k;

144 uint8_t *Y, *C;

145 int loc_lim, cur_lim, left_lim = 0, top_lim = 0;

146

147 mb_pos = row * s->mb_stride;

148 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){

149 int mbtype = s->current_picture_ptr->mb_type[mb_pos];

150 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))

151 r->deblock_coefs[mb_pos] = 0xFFFF;

152 if(IS_INTRA(mbtype))

153 r->cbp_chroma[mb_pos] = 0xFF;

154 }

155

156 /* all vertical edges are filtered first

157 * and horizontal edges are filtered on the next iteration

158 */

159 mb_pos = row * s->mb_stride;

160 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){

161 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];

162 if(mb_x)

163 left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];

164 for(j = 0; j < 16; j += 4){

165 Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;

166 for(i = !mb_x; i < 4; i++, Y += 4){

167 int ij = i + j;

168 loc_lim = 0;

169 if(r->deblock_coefs[mb_pos] & (1 << ij))

170 loc_lim = cur_lim;

171 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))

172 loc_lim = left_lim;

173 else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))

174 loc_lim = cur_lim;

175 if(loc_lim)

176 rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);

177 }

178 }

179 for(k = 0; k < 2; k++){

180 int cur_cbp, left_cbp = 0;

181 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;

182 if(mb_x)

183 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;

184 for(j = 0; j < 8; j += 4){

185 C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;

186 for(i = !mb_x; i < 2; i++, C += 4){

187 int ij = i + (j >> 1);

188 loc_lim = 0;

189 if (cur_cbp & (1 << ij))

190 loc_lim = cur_lim;

191 else if(!i && left_cbp & (1 << (ij + 1)))

192 loc_lim = left_lim;

193 else if( i && cur_cbp & (1 << (ij - 1)))

194 loc_lim = cur_lim;

195 if(loc_lim)

196 rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);

197 }

198 }

199 }

200 }

201 mb_pos = row * s->mb_stride;

202 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){

203 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];

204 if(row)

205 top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];

206 for(j = 4*!row; j < 16; j += 4){

207 Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;

208 for(i = 0; i < 4; i++, Y += 4){

209 int ij = i + j;

210 loc_lim = 0;

211 if(r->deblock_coefs[mb_pos] & (1 << ij))

212 loc_lim = cur_lim;

213 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))

214 loc_lim = top_lim;

215 else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))

216 loc_lim = cur_lim;

217 if(loc_lim)

218 rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);

219 }

220 }

221 for(k = 0; k < 2; k++){

222 int cur_cbp, top_cbp = 0;

223 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;

224 if(row)

225 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;

226 for(j = 4*!row; j < 8; j += 4){

227 C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;

228 for(i = 0; i < 2; i++, C += 4){

229 int ij = i + (j >> 1);

230 loc_lim = 0;

231 if (r->cbp_chroma[mb_pos] & (1 << ij))

232 loc_lim = cur_lim;

233 else if(!j && top_cbp & (1 << (ij + 2)))

234 loc_lim = top_lim;

235 else if( j && cur_cbp & (1 << (ij - 2)))

236 loc_lim = cur_lim;

237 if(loc_lim)

238 rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);

239 }

240 }

241 }

242 }

243 }

244

245 /**

246 * Initialize decoder.

247 */

248 static av_cold int rv30_decode_init(AVCodecContext *avctx)

249 {

250 RV34DecContext *r = avctx->priv_data;

251 int ret;

252

253 r->rv30 = 1;

254 ret = ff_rv34_decode_init(avctx);

255 if (ret < 0)

256 return ret;

257 if(avctx->extradata_size < 2){

258 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");

259 return -1;

260 }

261 r->rpr = (avctx->extradata[1] & 7) >> 1;

262 r->rpr = FFMIN(r->rpr + 1, 3);

263 if(avctx->extradata_size - 8 < (r->rpr - 1) * 2){

264 av_log(avctx, AV_LOG_ERROR, "Insufficient extradata - need at least %d bytes, got %d\n",

265 6 + r->rpr * 2, avctx->extradata_size);

266 }

267 r->parse_slice_header = rv30_parse_slice_header;

268 r->decode_intra_types = rv30_decode_intra_types;

269 r->decode_mb_info = rv30_decode_mb_info;

270 r->loop_filter = rv30_loop_filter;

271 r->luma_dc_quant_i = rv30_luma_dc_quant;

272 r->luma_dc_quant_p = rv30_luma_dc_quant;

273 return 0;

274 }

275

276 AVCodec ff_rv30_decoder = {

277 .name = "rv30",

278 .type = AVMEDIA_TYPE_VIDEO,

279 .id = AV_CODEC_ID_RV30,

280 .priv_data_size = sizeof(RV34DecContext),

281 .init = rv30_decode_init,

282 .close = ff_rv34_decode_end,

283 .decode = ff_rv34_decode_frame,

284 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY |

285 CODEC_CAP_FRAME_THREADS,

286 .flush = ff_mpeg_flush,

287 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),

288 .pix_fmts = ff_pixfmt_list_420,

289 .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),

290 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),

291 };

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