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 "mpegutils.h"

29 #include "mpegvideo.h"

30 #include "golomb.h"

32 #include "rv34.h"

33 #include "rv30data.h"

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

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;

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 }

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 }

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

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

70 }

71 si->width = w;

72 si->height = h;

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

74 mb_bits = ff_rv34_get_start_offset(gb, mb_size);

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

76 skip_bits1(gb);

77 return 0;

78 }

80 /**

81 * Decode 4x4 intra types array.

82 */

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

84 {

85 int i, j, k;

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

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

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

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

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

92 return -1;

93 }

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

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

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

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

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

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

100 return -1;

101 }

102 }

103 }

104 }

105 return 0;

106 }

107

108 /**

109 * Decode macroblock information.

110 */

111 static int rv30_decode_mb_info(RV34DecContext *r)

112 {

113 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 };

114 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 };

115 MpegEncContext *s = &r->s;

116 GetBitContext *gb = &s->gb;

117 unsigned code = svq3_get_ue_golomb(gb);

118

119 if (code > 11) {

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

121 return -1;

122 }

123 if(code > 5){

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

125 code -= 6;

126 }

127 if(s->pict_type != AV_PICTURE_TYPE_B)

128 return rv30_p_types[code];

129 else

130 return rv30_b_types[code];

131 }

132

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

134 const int stride, const int lim)

135 {

136 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

137 int i, diff;

138

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

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

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

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

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

144 src += stride;

145 }

146 }

147

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

149 {

150 MpegEncContext *s = &r->s;

151 int mb_pos, mb_x;

152 int i, j, k;

153 uint8_t *Y, *C;

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

155

156 mb_pos = row * s->mb_stride;

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

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

159 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))

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

161 if(IS_INTRA(mbtype))

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

163 }

164

165 /* all vertical edges are filtered first

166 * and horizontal edges are filtered on the next iteration

167 */

168 mb_pos = row * s->mb_stride;

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

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

171 if(mb_x)

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

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

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

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

176 int ij = i + j;

177 loc_lim = 0;

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

179 loc_lim = cur_lim;

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

181 loc_lim = left_lim;

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

183 loc_lim = cur_lim;

184 if(loc_lim)

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

186 }

187 }

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

189 int cur_cbp, left_cbp = 0;

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

191 if(mb_x)

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

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

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

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

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

197 loc_lim = 0;

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

199 loc_lim = cur_lim;

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

201 loc_lim = left_lim;

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

203 loc_lim = cur_lim;

204 if(loc_lim)

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

206 }

207 }

208 }

209 }

210 mb_pos = row * s->mb_stride;

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

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

213 if(row)

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

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

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

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

218 int ij = i + j;

219 loc_lim = 0;

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

221 loc_lim = cur_lim;

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

223 loc_lim = top_lim;

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

225 loc_lim = cur_lim;

226 if(loc_lim)

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

228 }

229 }

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

231 int cur_cbp, top_cbp = 0;

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

233 if(row)

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

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

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

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

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

239 loc_lim = 0;

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

241 loc_lim = cur_lim;

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

243 loc_lim = top_lim;

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

245 loc_lim = cur_lim;

246 if(loc_lim)

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

248 }

249 }

250 }

251 }

252 }

253

254 /**

255 * Initialize decoder.

256 */

257 static av_cold int rv30_decode_init(AVCodecContext *avctx)

258 {

259 RV34DecContext *r = avctx->priv_data;

260 int ret;

261

262 r->rv30 = 1;

263 if ((ret = ff_rv34_decode_init(avctx)) < 0)

264 return ret;

265 if(avctx->extradata_size < 2){

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

267 return -1;

268 }

269

270 r->max_rpr = avctx->extradata[1] & 7;

271 if(avctx->extradata_size < 2*r->max_rpr + 8){

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

273 2*r->max_rpr + 8, avctx->extradata_size);

274 }

275

276 r->parse_slice_header = rv30_parse_slice_header;

277 r->decode_intra_types = rv30_decode_intra_types;

278 r->decode_mb_info = rv30_decode_mb_info;

279 r->loop_filter = rv30_loop_filter;

280 r->luma_dc_quant_i = rv30_luma_dc_quant;

281 r->luma_dc_quant_p = rv30_luma_dc_quant;

282 return 0;

283 }

284

285 AVCodec ff_rv30_decoder = {

286 .name = "rv30",

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

288 .type = AVMEDIA_TYPE_VIDEO,

289 .id = AV_CODEC_ID_RV30,

290 .priv_data_size = sizeof(RV34DecContext),

291 .init = rv30_decode_init,

292 .close = ff_rv34_decode_end,

293 .decode = ff_rv34_decode_frame,

294 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY |

295 CODEC_CAP_FRAME_THREADS,

296 .flush = ff_mpeg_flush,

297 .pix_fmts = (const enum AVPixelFormat[]) {

298 AV_PIX_FMT_YUV420P,

299 AV_PIX_FMT_NONE

300 },

301 .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),

302 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),

303 };

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