Libav
asvenc.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2003 Michael Niedermayer
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
26 #include "libavutil/attributes.h"
27 #include "libavutil/mem.h"
28 
29 #include "asv.h"
30 #include "avcodec.h"
31 #include "mathops.h"
32 #include "mpeg12data.h"
33 
34 static inline void asv2_put_bits(PutBitContext *pb, int n, int v){
35  put_bits(pb, n, ff_reverse[ v << (8-n) ]);
36 }
37 
38 static inline void asv1_put_level(PutBitContext *pb, int level){
39  unsigned int index= level + 3;
40 
41  if(index <= 6) put_bits(pb, ff_asv_level_tab[index][1], ff_asv_level_tab[index][0]);
42  else{
43  put_bits(pb, ff_asv_level_tab[3][1], ff_asv_level_tab[3][0]);
44  put_sbits(pb, 8, level);
45  }
46 }
47 
48 static inline void asv2_put_level(PutBitContext *pb, int level){
49  unsigned int index= level + 31;
50 
51  if(index <= 62) put_bits(pb, ff_asv2_level_tab[index][1], ff_asv2_level_tab[index][0]);
52  else{
53  put_bits(pb, ff_asv2_level_tab[31][1], ff_asv2_level_tab[31][0]);
54  asv2_put_bits(pb, 8, level&0xFF);
55  }
56 }
57 
58 static inline void asv1_encode_block(ASV1Context *a, int16_t block[64]){
59  int i;
60  int nc_count=0;
61 
62  put_bits(&a->pb, 8, (block[0] + 32)>>6);
63  block[0]= 0;
64 
65  for(i=0; i<10; i++){
66  const int index = ff_asv_scantab[4*i];
67  int ccp=0;
68 
69  if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
70  if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
71  if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
72  if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
73 
74  if(ccp){
75  for(;nc_count; nc_count--)
76  put_bits(&a->pb, ff_asv_ccp_tab[0][1], ff_asv_ccp_tab[0][0]);
77 
78  put_bits(&a->pb, ff_asv_ccp_tab[ccp][1], ff_asv_ccp_tab[ccp][0]);
79 
80  if(ccp&8) asv1_put_level(&a->pb, block[index + 0]);
81  if(ccp&4) asv1_put_level(&a->pb, block[index + 8]);
82  if(ccp&2) asv1_put_level(&a->pb, block[index + 1]);
83  if(ccp&1) asv1_put_level(&a->pb, block[index + 9]);
84  }else{
85  nc_count++;
86  }
87  }
88  put_bits(&a->pb, ff_asv_ccp_tab[16][1], ff_asv_ccp_tab[16][0]);
89 }
90 
91 static inline void asv2_encode_block(ASV1Context *a, int16_t block[64]){
92  int i;
93  int count=0;
94 
95  for(count=63; count>3; count--){
96  const int index = ff_asv_scantab[count];
97 
98  if( (block[index]*a->q_intra_matrix[index] + (1<<15))>>16 )
99  break;
100  }
101 
102  count >>= 2;
103 
104  asv2_put_bits(&a->pb, 4, count);
105  asv2_put_bits(&a->pb, 8, (block[0] + 32)>>6);
106  block[0]= 0;
107 
108  for(i=0; i<=count; i++){
109  const int index = ff_asv_scantab[4*i];
110  int ccp=0;
111 
112  if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
113  if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
114  if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
115  if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
116 
117  assert(i || ccp<8);
118  if(i) put_bits(&a->pb, ff_asv_ac_ccp_tab[ccp][1], ff_asv_ac_ccp_tab[ccp][0]);
119  else put_bits(&a->pb, ff_asv_dc_ccp_tab[ccp][1], ff_asv_dc_ccp_tab[ccp][0]);
120 
121  if(ccp){
122  if(ccp&8) asv2_put_level(&a->pb, block[index + 0]);
123  if(ccp&4) asv2_put_level(&a->pb, block[index + 8]);
124  if(ccp&2) asv2_put_level(&a->pb, block[index + 1]);
125  if(ccp&1) asv2_put_level(&a->pb, block[index + 9]);
126  }
127  }
128 }
129 
130 #define MAX_MB_SIZE (30*16*16*3/2/8)
131 
132 static inline int encode_mb(ASV1Context *a, int16_t block[6][64]){
133  int i;
134 
135  if (a->pb.buf_end - a->pb.buf - (put_bits_count(&a->pb)>>3) < MAX_MB_SIZE) {
136  av_log(a->avctx, AV_LOG_ERROR, "encoded frame too large\n");
137  return -1;
138  }
139 
140  if(a->avctx->codec_id == AV_CODEC_ID_ASV1){
141  for(i=0; i<6; i++)
142  asv1_encode_block(a, block[i]);
143  }else{
144  for(i=0; i<6; i++)
145  asv2_encode_block(a, block[i]);
146  }
147  return 0;
148 }
149 
150 static inline void dct_get(ASV1Context *a, const AVFrame *frame,
151  int mb_x, int mb_y)
152 {
153  int16_t (*block)[64]= a->block;
154  int linesize = frame->linesize[0];
155  int i;
156 
157  uint8_t *ptr_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16;
158  uint8_t *ptr_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
159  uint8_t *ptr_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
160 
161  a->dsp.get_pixels(block[0], ptr_y , linesize);
162  a->dsp.get_pixels(block[1], ptr_y + 8, linesize);
163  a->dsp.get_pixels(block[2], ptr_y + 8*linesize , linesize);
164  a->dsp.get_pixels(block[3], ptr_y + 8*linesize + 8, linesize);
165  for(i=0; i<4; i++)
166  a->dsp.fdct(block[i]);
167 
168  if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
169  a->dsp.get_pixels(block[4], ptr_cb, frame->linesize[1]);
170  a->dsp.get_pixels(block[5], ptr_cr, frame->linesize[2]);
171  for(i=4; i<6; i++)
172  a->dsp.fdct(block[i]);
173  }
174 }
175 
176 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
177  const AVFrame *pict, int *got_packet)
178 {
179  ASV1Context * const a = avctx->priv_data;
180  int size, ret;
181  int mb_x, mb_y;
182 
183  if (!pkt->data &&
184  (ret = av_new_packet(pkt, a->mb_height*a->mb_width*MAX_MB_SIZE +
185  FF_MIN_BUFFER_SIZE)) < 0) {
186  av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
187  return ret;
188  }
189 
190  init_put_bits(&a->pb, pkt->data, pkt->size);
191 
192  for(mb_y=0; mb_y<a->mb_height2; mb_y++){
193  for(mb_x=0; mb_x<a->mb_width2; mb_x++){
194  dct_get(a, pict, mb_x, mb_y);
195  encode_mb(a, a->block);
196  }
197  }
198 
199  if(a->mb_width2 != a->mb_width){
200  mb_x= a->mb_width2;
201  for(mb_y=0; mb_y<a->mb_height2; mb_y++){
202  dct_get(a, pict, mb_x, mb_y);
203  encode_mb(a, a->block);
204  }
205  }
206 
207  if(a->mb_height2 != a->mb_height){
208  mb_y= a->mb_height2;
209  for(mb_x=0; mb_x<a->mb_width; mb_x++){
210  dct_get(a, pict, mb_x, mb_y);
211  encode_mb(a, a->block);
212  }
213  }
214  emms_c();
215 
217  while(put_bits_count(&a->pb)&31)
218  put_bits(&a->pb, 8, 0);
219 
220  size= put_bits_count(&a->pb)/32;
221 
222  if(avctx->codec_id == AV_CODEC_ID_ASV1)
223  a->dsp.bswap_buf((uint32_t*)pkt->data, (uint32_t*)pkt->data, size);
224  else{
225  int i;
226  for(i=0; i<4*size; i++)
227  pkt->data[i] = ff_reverse[pkt->data[i]];
228  }
229 
230  pkt->size = size*4;
231  pkt->flags |= AV_PKT_FLAG_KEY;
232  *got_packet = 1;
233 
234  return 0;
235 }
236 
237 static av_cold int encode_init(AVCodecContext *avctx){
238  ASV1Context * const a = avctx->priv_data;
239  int i;
240  const int scale= avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
241 
242  avctx->coded_frame = av_frame_alloc();
243  if (!avctx->coded_frame)
244  return AVERROR(ENOMEM);
246  avctx->coded_frame->key_frame = 1;
247 
248  ff_asv_common_init(avctx);
249 
250  if(avctx->global_quality == 0) avctx->global_quality= 4*FF_QUALITY_SCALE;
251 
252  a->inv_qscale= (32*scale*FF_QUALITY_SCALE + avctx->global_quality/2) / avctx->global_quality;
253 
254  avctx->extradata= av_mallocz(8);
255  avctx->extradata_size=8;
256  ((uint32_t*)avctx->extradata)[0]= av_le2ne32(a->inv_qscale);
257  ((uint32_t*)avctx->extradata)[1]= av_le2ne32(AV_RL32("ASUS"));
258 
259  for(i=0; i<64; i++){
260  int q= 32*scale*ff_mpeg1_default_intra_matrix[i];
261  a->q_intra_matrix[i]= ((a->inv_qscale<<16) + q/2) / q;
262  }
263 
264  return 0;
265 }
267 {
268  av_frame_free(&avctx->coded_frame);
269 
270  return 0;
271 }
272 
273 #if CONFIG_ASV1_ENCODER
274 AVCodec ff_asv1_encoder = {
275  .name = "asv1",
276  .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
277  .type = AVMEDIA_TYPE_VIDEO,
278  .id = AV_CODEC_ID_ASV1,
279  .priv_data_size = sizeof(ASV1Context),
280  .init = encode_init,
281  .encode2 = encode_frame,
283  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
284  AV_PIX_FMT_NONE },
285 };
286 #endif
287 
288 #if CONFIG_ASV2_ENCODER
289 AVCodec ff_asv2_encoder = {
290  .name = "asv2",
291  .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
292  .type = AVMEDIA_TYPE_VIDEO,
293  .id = AV_CODEC_ID_ASV2,
294  .priv_data_size = sizeof(ASV1Context),
295  .init = encode_init,
296  .encode2 = encode_frame,
298  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
299  AV_PIX_FMT_NONE },
300 };
301 #endif