2 * Copyright (c) 2003 Michael Niedermayer
4 * This file is part of Libav.
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.
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.
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
26 #include "libavutil/common.h"
27 #include "libavutil/mem.h"
33 #include "mpeg12data.h"
39 #define ASV2_LEVEL_VLC_BITS 10
43 static VLC dc_ccp_vlc;
44 static VLC ac_ccp_vlc;
45 static VLC asv2_level_vlc;
47 static av_cold void init_vlcs(ASV1Context *a){
53 INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
54 &ff_asv_ccp_tab[0][1], 2, 1,
55 &ff_asv_ccp_tab[0][0], 2, 1, 64);
56 INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
57 &ff_asv_dc_ccp_tab[0][1], 2, 1,
58 &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
59 INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
60 &ff_asv_ac_ccp_tab[0][1], 2, 1,
61 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
62 INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
63 &ff_asv_level_tab[0][1], 2, 1,
64 &ff_asv_level_tab[0][0], 2, 1, 64);
65 INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
66 &ff_asv2_level_tab[0][1], 2, 1,
67 &ff_asv2_level_tab[0][0], 2, 1, 1024);
71 //FIXME write a reversed bitstream reader to avoid the double reverse
72 static inline int asv2_get_bits(GetBitContext *gb, int n){
73 return av_reverse[ get_bits(gb, n) << (8-n) ];
76 static inline int asv1_get_level(GetBitContext *gb){
77 int code= get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
79 if(code==3) return get_sbits(gb, 8);
83 static inline int asv2_get_level(GetBitContext *gb){
84 int code= get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
86 if(code==31) return (int8_t)asv2_get_bits(gb, 8);
87 else return code - 31;
90 static inline int asv1_decode_block(ASV1Context *a, DCTELEM block[64]){
93 block[0]= 8*get_bits(&a->gb, 8);
96 const int ccp= get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
100 if(ccp < 0 || i>=10){
101 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
105 if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
106 if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
107 if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
108 if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
115 static inline int asv2_decode_block(ASV1Context *a, DCTELEM block[64]){
118 count= asv2_get_bits(&a->gb, 4);
120 block[0]= 8*asv2_get_bits(&a->gb, 8);
122 ccp= get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
124 if(ccp&4) block[a->scantable.permutated[1]]= (asv2_get_level(&a->gb) * a->intra_matrix[1])>>4;
125 if(ccp&2) block[a->scantable.permutated[2]]= (asv2_get_level(&a->gb) * a->intra_matrix[2])>>4;
126 if(ccp&1) block[a->scantable.permutated[3]]= (asv2_get_level(&a->gb) * a->intra_matrix[3])>>4;
129 for(i=1; i<count+1; i++){
130 const int ccp= get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
133 if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
134 if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
135 if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
136 if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
143 static inline int decode_mb(ASV1Context *a, DCTELEM block[6][64]){
146 a->dsp.clear_blocks(block[0]);
148 if(a->avctx->codec_id == AV_CODEC_ID_ASV1){
150 if( asv1_decode_block(a, block[i]) < 0)
155 if( asv2_decode_block(a, block[i]) < 0)
162 static inline void idct_put(ASV1Context *a, int mb_x, int mb_y){
163 DCTELEM (*block)[64]= a->block;
164 int linesize= a->picture.linesize[0];
166 uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
167 uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
168 uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
170 a->dsp.idct_put(dest_y , linesize, block[0]);
171 a->dsp.idct_put(dest_y + 8, linesize, block[1]);
172 a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
173 a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
175 if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
176 a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
177 a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
181 static int decode_frame(AVCodecContext *avctx,
182 void *data, int *data_size,
185 const uint8_t *buf = avpkt->data;
186 int buf_size = avpkt->size;
187 ASV1Context * const a = avctx->priv_data;
188 AVFrame *picture = data;
189 AVFrame * const p= &a->picture;
193 avctx->release_buffer(avctx, p);
196 if(avctx->get_buffer(avctx, p) < 0){
197 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
200 p->pict_type= AV_PICTURE_TYPE_I;
203 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
205 if (!a->bitstream_buffer)
206 return AVERROR(ENOMEM);
208 if(avctx->codec_id == AV_CODEC_ID_ASV1)
209 a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
212 for(i=0; i<buf_size; i++)
213 a->bitstream_buffer[i]= av_reverse[ buf[i] ];
216 init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
218 for(mb_y=0; mb_y<a->mb_height2; mb_y++){
219 for(mb_x=0; mb_x<a->mb_width2; mb_x++){
220 if( decode_mb(a, a->block) <0)
223 idct_put(a, mb_x, mb_y);
227 if(a->mb_width2 != a->mb_width){
229 for(mb_y=0; mb_y<a->mb_height2; mb_y++){
230 if( decode_mb(a, a->block) <0)
233 idct_put(a, mb_x, mb_y);
237 if(a->mb_height2 != a->mb_height){
239 for(mb_x=0; mb_x<a->mb_width; mb_x++){
240 if( decode_mb(a, a->block) <0)
243 idct_put(a, mb_x, mb_y);
247 *picture = a->picture;
248 *data_size = sizeof(AVPicture);
252 return (get_bits_count(&a->gb)+31)/32*4;
255 static av_cold int decode_init(AVCodecContext *avctx){
256 ASV1Context * const a = avctx->priv_data;
257 AVFrame *p= &a->picture;
259 const int scale= avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
261 ff_asv_common_init(avctx);
263 ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_asv_scantab);
264 avctx->pix_fmt= AV_PIX_FMT_YUV420P;
266 a->inv_qscale= avctx->extradata[0];
267 if(a->inv_qscale == 0){
268 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
269 if(avctx->codec_id == AV_CODEC_ID_ASV1)
276 int index = ff_asv_scantab[i];
278 a->intra_matrix[i]= 64*scale*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
281 p->qstride= a->mb_width;
282 p->qscale_table= av_malloc( p->qstride * a->mb_height);
283 p->quality= (32*scale + a->inv_qscale/2)/a->inv_qscale;
284 memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
289 static av_cold int decode_end(AVCodecContext *avctx){
290 ASV1Context * const a = avctx->priv_data;
292 av_freep(&a->bitstream_buffer);
293 av_freep(&a->picture.qscale_table);
294 a->bitstream_buffer_size=0;
296 if(a->picture.data[0])
297 avctx->release_buffer(avctx, &a->picture);
302 AVCodec ff_asv1_decoder = {
304 .type = AVMEDIA_TYPE_VIDEO,
305 .id = AV_CODEC_ID_ASV1,
306 .priv_data_size = sizeof(ASV1Context),
309 .decode = decode_frame,
310 .capabilities = CODEC_CAP_DR1,
311 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
314 AVCodec ff_asv2_decoder = {
316 .type = AVMEDIA_TYPE_VIDEO,
317 .id = AV_CODEC_ID_ASV2,
318 .priv_data_size = sizeof(ASV1Context),
321 .decode = decode_frame,
322 .capabilities = CODEC_CAP_DR1,
323 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),