2 * Copyright (c) 2003 Michael Niedermayer
4 * This file is part of FFmpeg.
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.
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.
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
26 #include "libavutil/common.h"
27 #include "libavutil/mem.h"
33 #include "mpeg12data.h"
36 #define ASV2_LEVEL_VLC_BITS 10
40 static VLC dc_ccp_vlc;
41 static VLC ac_ccp_vlc;
42 static VLC asv2_level_vlc;
44 static av_cold void init_vlcs(ASV1Context *a){
50 INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
51 &ff_asv_ccp_tab[0][1], 2, 1,
52 &ff_asv_ccp_tab[0][0], 2, 1, 64);
53 INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
54 &ff_asv_dc_ccp_tab[0][1], 2, 1,
55 &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
56 INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
57 &ff_asv_ac_ccp_tab[0][1], 2, 1,
58 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
59 INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
60 &ff_asv_level_tab[0][1], 2, 1,
61 &ff_asv_level_tab[0][0], 2, 1, 64);
62 INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
63 &ff_asv2_level_tab[0][1], 2, 1,
64 &ff_asv2_level_tab[0][0], 2, 1, 1024);
68 //FIXME write a reversed bitstream reader to avoid the double reverse
69 static inline int asv2_get_bits(GetBitContext *gb, int n){
70 return av_reverse[ get_bits(gb, n) << (8-n) ];
73 static inline int asv1_get_level(GetBitContext *gb){
74 int code= get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
76 if(code==3) return get_sbits(gb, 8);
80 static inline int asv2_get_level(GetBitContext *gb){
81 int code= get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
83 if(code==31) return (int8_t)asv2_get_bits(gb, 8);
84 else return code - 31;
87 static inline int asv1_decode_block(ASV1Context *a, DCTELEM block[64]){
90 block[0]= 8*get_bits(&a->gb, 8);
93 const int ccp= get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
98 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
102 if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
103 if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
104 if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
105 if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
112 static inline int asv2_decode_block(ASV1Context *a, DCTELEM block[64]){
115 count= asv2_get_bits(&a->gb, 4);
117 block[0]= 8*asv2_get_bits(&a->gb, 8);
119 ccp= get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
121 if(ccp&4) block[a->scantable.permutated[1]]= (asv2_get_level(&a->gb) * a->intra_matrix[1])>>4;
122 if(ccp&2) block[a->scantable.permutated[2]]= (asv2_get_level(&a->gb) * a->intra_matrix[2])>>4;
123 if(ccp&1) block[a->scantable.permutated[3]]= (asv2_get_level(&a->gb) * a->intra_matrix[3])>>4;
126 for(i=1; i<count+1; i++){
127 const int ccp= get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
130 if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
131 if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
132 if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
133 if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
140 static inline int decode_mb(ASV1Context *a, DCTELEM block[6][64]){
143 a->dsp.clear_blocks(block[0]);
145 if(a->avctx->codec_id == AV_CODEC_ID_ASV1){
147 if( asv1_decode_block(a, block[i]) < 0)
152 if( asv2_decode_block(a, block[i]) < 0)
159 static inline void idct_put(ASV1Context *a, int mb_x, int mb_y){
160 DCTELEM (*block)[64]= a->block;
161 int linesize= a->picture.linesize[0];
163 uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
164 uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
165 uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
167 a->dsp.idct_put(dest_y , linesize, block[0]);
168 a->dsp.idct_put(dest_y + 8, linesize, block[1]);
169 a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
170 a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
172 if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
173 a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
174 a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
178 static int decode_frame(AVCodecContext *avctx,
179 void *data, int *data_size,
182 const uint8_t *buf = avpkt->data;
183 int buf_size = avpkt->size;
184 ASV1Context * const a = avctx->priv_data;
185 AVFrame *picture = data;
186 AVFrame * const p= &a->picture;
190 avctx->release_buffer(avctx, p);
193 if(avctx->get_buffer(avctx, p) < 0){
194 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
197 p->pict_type= AV_PICTURE_TYPE_I;
200 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
202 if (!a->bitstream_buffer)
203 return AVERROR(ENOMEM);
205 if(avctx->codec_id == AV_CODEC_ID_ASV1)
206 a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
209 for(i=0; i<buf_size; i++)
210 a->bitstream_buffer[i]= av_reverse[ buf[i] ];
213 init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
215 for(mb_y=0; mb_y<a->mb_height2; mb_y++){
216 for(mb_x=0; mb_x<a->mb_width2; mb_x++){
217 if( decode_mb(a, a->block) <0)
220 idct_put(a, mb_x, mb_y);
224 if(a->mb_width2 != a->mb_width){
226 for(mb_y=0; mb_y<a->mb_height2; mb_y++){
227 if( decode_mb(a, a->block) <0)
230 idct_put(a, mb_x, mb_y);
234 if(a->mb_height2 != a->mb_height){
236 for(mb_x=0; mb_x<a->mb_width; mb_x++){
237 if( decode_mb(a, a->block) <0)
240 idct_put(a, mb_x, mb_y);
244 *picture = a->picture;
245 *data_size = sizeof(AVPicture);
249 return (get_bits_count(&a->gb)+31)/32*4;
252 static av_cold int decode_init(AVCodecContext *avctx){
253 ASV1Context * const a = avctx->priv_data;
254 AVFrame *p= &a->picture;
256 const int scale= avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
258 ff_asv_common_init(avctx);
260 ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_asv_scantab);
261 avctx->pix_fmt= AV_PIX_FMT_YUV420P;
263 if(avctx->extradata_size < 1 || (a->inv_qscale= avctx->extradata[0]) == 0){
264 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
265 if(avctx->codec_id == AV_CODEC_ID_ASV1)
272 int index = ff_asv_scantab[i];
274 a->intra_matrix[i]= 64*scale*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
277 p->qstride= a->mb_width;
278 p->qscale_table= av_malloc( p->qstride * a->mb_height);
279 p->quality= (32*scale + a->inv_qscale/2)/a->inv_qscale;
280 memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
285 static av_cold int decode_end(AVCodecContext *avctx){
286 ASV1Context * const a = avctx->priv_data;
288 av_freep(&a->bitstream_buffer);
289 av_freep(&a->picture.qscale_table);
290 a->bitstream_buffer_size=0;
292 if(a->picture.data[0])
293 avctx->release_buffer(avctx, &a->picture);
298 #if CONFIG_ASV1_DECODER
299 AVCodec ff_asv1_decoder = {
301 .type = AVMEDIA_TYPE_VIDEO,
302 .id = AV_CODEC_ID_ASV1,
303 .priv_data_size = sizeof(ASV1Context),
306 .decode = decode_frame,
307 .capabilities = CODEC_CAP_DR1,
308 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
312 #if CONFIG_ASV2_DECODER
313 AVCodec ff_asv2_decoder = {
315 .type = AVMEDIA_TYPE_VIDEO,
316 .id = AV_CODEC_ID_ASV2,
317 .priv_data_size = sizeof(ASV1Context),
320 .decode = decode_frame,
321 .capabilities = CODEC_CAP_DR1,
322 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),