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asvenc.c
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1 /*
2  * Copyright (c) 2003 Michael Niedermayer
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  */
20 
21 /**
22  * @file
23  * ASUS V1/V2 encoder.
24  */
25 
26 #include "libavutil/attributes.h"
27 #include "libavutil/mem.h"
28 
29 #include "asv.h"
30 #include "avcodec.h"
31 #include "internal.h"
32 #include "mathops.h"
33 #include "mpeg12data.h"
34 
35 static inline void asv2_put_bits(PutBitContext *pb, int n, int v){
36  put_bits(pb, n, ff_reverse[ v << (8-n) ]);
37 }
38 
39 static inline void asv1_put_level(PutBitContext *pb, int level){
40  unsigned int index= level + 3;
41 
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 }
48 
49 static inline void asv2_put_level(PutBitContext *pb, int level){
50  unsigned int index= level + 31;
51 
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 }
58 
59 static inline void asv1_encode_block(ASV1Context *a, int16_t block[64]){
60  int i;
61  int nc_count=0;
62 
63  put_bits(&a->pb, 8, (block[0] + 32)>>6);
64  block[0]= 0;
65 
66  for(i=0; i<10; i++){
67  const int index = ff_asv_scantab[4*i];
68  int ccp=0;
69 
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;
74 
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]);
78 
79  put_bits(&a->pb, ff_asv_ccp_tab[ccp][1], ff_asv_ccp_tab[ccp][0]);
80 
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 }
91 
92 static inline void asv2_encode_block(ASV1Context *a, int16_t block[64]){
93  int i;
94  int count=0;
95 
96  for(count=63; count>3; count--){
97  const int index = ff_asv_scantab[count];
98 
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, int mb_x, int mb_y){
152  int16_t (*block)[64]= a->block;
153  int linesize= a->picture.linesize[0];
154  int i;
155 
156  uint8_t *ptr_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
157  uint8_t *ptr_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
158  uint8_t *ptr_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
159 
160  a->dsp.get_pixels(block[0], ptr_y , linesize);
161  a->dsp.get_pixels(block[1], ptr_y + 8, linesize);
162  a->dsp.get_pixels(block[2], ptr_y + 8*linesize , linesize);
163  a->dsp.get_pixels(block[3], ptr_y + 8*linesize + 8, linesize);
164  for(i=0; i<4; i++)
165  a->dsp.fdct(block[i]);
166 
167  if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
168  a->dsp.get_pixels(block[4], ptr_cb, a->picture.linesize[1]);
169  a->dsp.get_pixels(block[5], ptr_cr, a->picture.linesize[2]);
170  for(i=4; i<6; i++)
171  a->dsp.fdct(block[i]);
172  }
173 }
174 
175 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
176  const AVFrame *pict, int *got_packet)
177 {
178  ASV1Context * const a = avctx->priv_data;
179  AVFrame * const p= &a->picture;
180  int size, ret;
181  int mb_x, mb_y;
182 
183  if ((ret = ff_alloc_packet2(avctx, pkt, a->mb_height*a->mb_width*MAX_MB_SIZE +
184  FF_MIN_BUFFER_SIZE)) < 0)
185  return ret;
186 
187  init_put_bits(&a->pb, pkt->data, pkt->size);
188 
189  *p = *pict;
190  p->pict_type= AV_PICTURE_TYPE_I;
191  p->key_frame= 1;
192 
193  for(mb_y=0; mb_y<a->mb_height2; mb_y++){
194  for(mb_x=0; mb_x<a->mb_width2; mb_x++){
195  dct_get(a, mb_x, mb_y);
196  encode_mb(a, a->block);
197  }
198  }
199 
200  if(a->mb_width2 != a->mb_width){
201  mb_x= a->mb_width2;
202  for(mb_y=0; mb_y<a->mb_height2; mb_y++){
203  dct_get(a, mb_x, mb_y);
204  encode_mb(a, a->block);
205  }
206  }
207 
208  if(a->mb_height2 != a->mb_height){
209  mb_y= a->mb_height2;
210  for(mb_x=0; mb_x<a->mb_width; mb_x++){
211  dct_get(a, mb_x, mb_y);
212  encode_mb(a, a->block);
213  }
214  }
215  emms_c();
216 
217  avpriv_align_put_bits(&a->pb);
218  while(put_bits_count(&a->pb)&31)
219  put_bits(&a->pb, 8, 0);
220 
221  size= put_bits_count(&a->pb)/32;
222 
223  if(avctx->codec_id == AV_CODEC_ID_ASV1)
224  a->dsp.bswap_buf((uint32_t*)pkt->data, (uint32_t*)pkt->data, size);
225  else{
226  int i;
227  for(i=0; i<4*size; i++)
228  pkt->data[i] = ff_reverse[pkt->data[i]];
229  }
230 
231  pkt->size = size*4;
232  pkt->flags |= AV_PKT_FLAG_KEY;
233  *got_packet = 1;
234 
235  return 0;
236 }
237 
238 static av_cold int encode_init(AVCodecContext *avctx){
239  ASV1Context * const a = avctx->priv_data;
240  int i;
241  const int scale= avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
242 
243  ff_asv_common_init(avctx);
244 
245  if(avctx->global_quality == 0) avctx->global_quality= 4*FF_QUALITY_SCALE;
246 
247  a->inv_qscale= (32*scale*FF_QUALITY_SCALE + avctx->global_quality/2) / avctx->global_quality;
248 
249  avctx->extradata= av_mallocz(8);
250  avctx->extradata_size=8;
251  ((uint32_t*)avctx->extradata)[0]= av_le2ne32(a->inv_qscale);
252  ((uint32_t*)avctx->extradata)[1]= av_le2ne32(AV_RL32("ASUS"));
253 
254  for(i=0; i<64; i++){
255  int q= 32*scale*ff_mpeg1_default_intra_matrix[i];
256  a->q_intra_matrix[i]= ((a->inv_qscale<<16) + q/2) / q;
257  }
258 
259  return 0;
260 }
261 
262 #if CONFIG_ASV1_ENCODER
263 AVCodec ff_asv1_encoder = {
264  .name = "asv1",
265  .type = AVMEDIA_TYPE_VIDEO,
266  .id = AV_CODEC_ID_ASV1,
267  .priv_data_size = sizeof(ASV1Context),
268  .init = encode_init,
269  .encode2 = encode_frame,
270  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
271  AV_PIX_FMT_NONE },
272  .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
273 };
274 #endif
275 
276 #if CONFIG_ASV2_ENCODER
277 AVCodec ff_asv2_encoder = {
278  .name = "asv2",
279  .type = AVMEDIA_TYPE_VIDEO,
280  .id = AV_CODEC_ID_ASV2,
281  .priv_data_size = sizeof(ASV1Context),
282  .init = encode_init,
283  .encode2 = encode_frame,
284  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
285  AV_PIX_FMT_NONE },
286  .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
287 };
288 #endif
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