FFmpeg: libavcodec/asvenc.c Source File

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libavcodec

asvenc.c

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1 /*

3 *

4 * This file is part of FFmpeg.

5 *

6 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software

18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

19 */

21 /**

22 * @file

23 * ASUS V1/V2 encoder.

24 */

26 #include "libavutil/attributes.h"

27 #include "libavutil/mem.h"

29 #include "asv.h"

30 #include "avcodec.h"

31 #include "internal.h"

32 #include "mathops.h"

33 #include "mpeg12data.h"

35 static inline void asv2_put_bits(PutBitContext *pb, int n, int v){

36 put_bits(pb, n, ff_reverse[ v << (8-n) ]);

37 }

39 static inline void asv1_put_level(PutBitContext *pb, int level){

40 unsigned int index= level + 3;

42 if(index <= 6) put_bits(pb, ff_asv_level_tab[index][1], ff_asv_level_tab[index][0]);

43 else{

44 put_bits(pb, ff_asv_level_tab[3][1], ff_asv_level_tab[3][0]);

45 put_sbits(pb, 8, level);

46 }

47 }

49 static inline void asv2_put_level(PutBitContext *pb, int level){

50 unsigned int index= level + 31;

52 if(index <= 62) put_bits(pb, ff_asv2_level_tab[index][1], ff_asv2_level_tab[index][0]);

53 else{

54 put_bits(pb, ff_asv2_level_tab[31][1], ff_asv2_level_tab[31][0]);

55 asv2_put_bits(pb, 8, level&0xFF);

56 }

57 }

59 static inline void asv1_encode_block(ASV1Context *a, int16_t block[64]){

60 int i;

61 int nc_count=0;

63 put_bits(&a->pb, 8, (block[0] + 32)>>6);

64 block[0]= 0;

66 for(i=0; i<10; i++){

67 const int index = ff_asv_scantab[4*i];

68 int ccp=0;

70 if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;

71 if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;

72 if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;

73 if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;

75 if(ccp){

76 for(;nc_count; nc_count--)

77 put_bits(&a->pb, ff_asv_ccp_tab[0][1], ff_asv_ccp_tab[0][0]);

79 put_bits(&a->pb, ff_asv_ccp_tab[ccp][1], ff_asv_ccp_tab[ccp][0]);

81 if(ccp&8) asv1_put_level(&a->pb, block[index + 0]);

82 if(ccp&4) asv1_put_level(&a->pb, block[index + 8]);

83 if(ccp&2) asv1_put_level(&a->pb, block[index + 1]);

84 if(ccp&1) asv1_put_level(&a->pb, block[index + 9]);

85 }else{

86 nc_count++;

87 }

88 }

89 put_bits(&a->pb, ff_asv_ccp_tab[16][1], ff_asv_ccp_tab[16][0]);

90 }

92 static inline void asv2_encode_block(ASV1Context *a, int16_t block[64]){

93 int i;

94 int count=0;

96 for(count=63; count>3; count--){

97 const int index = ff_asv_scantab[count];

99 if( (block[index]*a->q_intra_matrix[index] + (1<<15))>>16 )

100 break;

101 }

102

103 count >>= 2;

104

105 asv2_put_bits(&a->pb, 4, count);

106 asv2_put_bits(&a->pb, 8, (block[0] + 32)>>6);

107 block[0]= 0;

108

109 for(i=0; i<=count; i++){

110 const int index = ff_asv_scantab[4*i];

111 int ccp=0;

112

113 if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;

114 if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;

115 if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;

116 if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;

117

118 av_assert2(i || ccp<8);

119 if(i) put_bits(&a->pb, ff_asv_ac_ccp_tab[ccp][1], ff_asv_ac_ccp_tab[ccp][0]);

120 else put_bits(&a->pb, ff_asv_dc_ccp_tab[ccp][1], ff_asv_dc_ccp_tab[ccp][0]);

121

122 if(ccp){

123 if(ccp&8) asv2_put_level(&a->pb, block[index + 0]);

124 if(ccp&4) asv2_put_level(&a->pb, block[index + 8]);

125 if(ccp&2) asv2_put_level(&a->pb, block[index + 1]);

126 if(ccp&1) asv2_put_level(&a->pb, block[index + 9]);

127 }

128 }

129 }

130

131 #define MAX_MB_SIZE (30*16*16*3/2/8)

132

133 static inline int encode_mb(ASV1Context *a, int16_t block[6][64]){

134 int i;

135

136 if (a->pb.buf_end - a->pb.buf - (put_bits_count(&a->pb)>>3) < MAX_MB_SIZE) {

137 av_log(a->avctx, AV_LOG_ERROR, "encoded frame too large\n");

138 return -1;

139 }

140

141 if(a->avctx->codec_id == AV_CODEC_ID_ASV1){

142 for(i=0; i<6; i++)

143 asv1_encode_block(a, block[i]);

144 }else{

145 for(i=0; i<6; i++)

146 asv2_encode_block(a, block[i]);

147 }

148 return 0;

149 }

150

151 static inline void dct_get(ASV1Context *a, const AVFrame *frame,

152 int mb_x, int mb_y)

153 {

154 int16_t (*block)[64]= a->block;

155 int linesize = frame->linesize[0];

156 int i;

157

158 uint8_t *ptr_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16;

159 uint8_t *ptr_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;

160 uint8_t *ptr_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;

161

162 a->dsp.get_pixels(block[0], ptr_y , linesize);

163 a->dsp.get_pixels(block[1], ptr_y + 8, linesize);

164 a->dsp.get_pixels(block[2], ptr_y + 8*linesize , linesize);

165 a->dsp.get_pixels(block[3], ptr_y + 8*linesize + 8, linesize);

166 for(i=0; i<4; i++)

167 a->dsp.fdct(block[i]);

168

169 if(!(a->avctx->flags&CODEC_FLAG_GRAY)){

170 a->dsp.get_pixels(block[4], ptr_cb, frame->linesize[1]);

171 a->dsp.get_pixels(block[5], ptr_cr, frame->linesize[2]);

172 for(i=4; i<6; i++)

173 a->dsp.fdct(block[i]);

174 }

175 }

176

177 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,

178 const AVFrame *pict, int *got_packet)

179 {

180 ASV1Context * const a = avctx->priv_data;

181 int size, ret;

182 int mb_x, mb_y;

183

184 if ((ret = ff_alloc_packet2(avctx, pkt, a->mb_height*a->mb_width*MAX_MB_SIZE +

185 FF_MIN_BUFFER_SIZE)) < 0)

186 return ret;

187

188 init_put_bits(&a->pb, pkt->data, pkt->size);

189

190 for(mb_y=0; mb_y<a->mb_height2; mb_y++){

191 for(mb_x=0; mb_x<a->mb_width2; mb_x++){

192 dct_get(a, pict, mb_x, mb_y);

193 encode_mb(a, a->block);

194 }

195 }

196

197 if(a->mb_width2 != a->mb_width){

198 mb_x= a->mb_width2;

199 for(mb_y=0; mb_y<a->mb_height2; mb_y++){

200 dct_get(a, pict, mb_x, mb_y);

201 encode_mb(a, a->block);

202 }

203 }

204

205 if(a->mb_height2 != a->mb_height){

206 mb_y= a->mb_height2;

207 for(mb_x=0; mb_x<a->mb_width; mb_x++){

208 dct_get(a, pict, mb_x, mb_y);

209 encode_mb(a, a->block);

210 }

211 }

212 emms_c();

213

214 avpriv_align_put_bits(&a->pb);

215 while(put_bits_count(&a->pb)&31)

216 put_bits(&a->pb, 8, 0);

217

218 size= put_bits_count(&a->pb)/32;

219

220 if(avctx->codec_id == AV_CODEC_ID_ASV1)

221 a->dsp.bswap_buf((uint32_t*)pkt->data, (uint32_t*)pkt->data, size);

222 else{

223 int i;

224 for(i=0; i<4*size; i++)

225 pkt->data[i] = ff_reverse[pkt->data[i]];

226 }

227

228 pkt->size = size*4;

229 pkt->flags |= AV_PKT_FLAG_KEY;

230 *got_packet = 1;

231

232 return 0;

233 }

234

235 static av_cold int encode_init(AVCodecContext *avctx){

236 ASV1Context * const a = avctx->priv_data;

237 int i;

238 const int scale= avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;

239

240 avctx->coded_frame = av_frame_alloc();

241 if (!avctx->coded_frame)

242 return AVERROR(ENOMEM);

243 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;

244 avctx->coded_frame->key_frame = 1;

245

246 ff_asv_common_init(avctx);

247

248 if(avctx->global_quality == 0) avctx->global_quality= 4*FF_QUALITY_SCALE;

249

250 a->inv_qscale= (32*scale*FF_QUALITY_SCALE + avctx->global_quality/2) / avctx->global_quality;

251

252 avctx->extradata= av_mallocz(8);

253 avctx->extradata_size=8;

254 ((uint32_t*)avctx->extradata)[0]= av_le2ne32(a->inv_qscale);

255 ((uint32_t*)avctx->extradata)[1]= av_le2ne32(AV_RL32("ASUS"));

256

257 for(i=0; i<64; i++){

258 int q= 32*scale*ff_mpeg1_default_intra_matrix[i];

259 a->q_intra_matrix[i]= ((a->inv_qscale<<16) + q/2) / q;

260 }

261

262 return 0;

263 }

264

265 #if CONFIG_ASV1_ENCODER

266 AVCodec ff_asv1_encoder = {

267 .name = "asv1",

268 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),

269 .type = AVMEDIA_TYPE_VIDEO,

270 .id = AV_CODEC_ID_ASV1,

271 .priv_data_size = sizeof(ASV1Context),

272 .init = encode_init,

273 .encode2 = encode_frame,

274 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,

275 AV_PIX_FMT_NONE },

276 };

277 #endif

278

279 #if CONFIG_ASV2_ENCODER

280 AVCodec ff_asv2_encoder = {

281 .name = "asv2",

282 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),

283 .type = AVMEDIA_TYPE_VIDEO,

284 .id = AV_CODEC_ID_ASV2,

285 .priv_data_size = sizeof(ASV1Context),

286 .init = encode_init,

287 .encode2 = encode_frame,

288 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,

289 AV_PIX_FMT_NONE },

290 };

291 #endif

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