Libav 0.7.1
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00001 /* 00002 * Sony PlayStation MDEC (Motion DECoder) 00003 * Copyright (c) 2003 Michael Niedermayer 00004 * 00005 * based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl> 00006 * 00007 * This file is part of Libav. 00008 * 00009 * Libav is free software; you can redistribute it and/or 00010 * modify it under the terms of the GNU Lesser General Public 00011 * License as published by the Free Software Foundation; either 00012 * version 2.1 of the License, or (at your option) any later version. 00013 * 00014 * Libav is distributed in the hope that it will be useful, 00015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00017 * Lesser General Public License for more details. 00018 * 00019 * You should have received a copy of the GNU Lesser General Public 00020 * License along with Libav; if not, write to the Free Software 00021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00022 */ 00023 00030 #include "avcodec.h" 00031 #include "dsputil.h" 00032 #include "mpegvideo.h" 00033 #include "mpeg12.h" 00034 #include "thread.h" 00035 00036 typedef struct MDECContext{ 00037 AVCodecContext *avctx; 00038 DSPContext dsp; 00039 AVFrame picture; 00040 GetBitContext gb; 00041 ScanTable scantable; 00042 int version; 00043 int qscale; 00044 int last_dc[3]; 00045 int mb_width; 00046 int mb_height; 00047 int mb_x, mb_y; 00048 DECLARE_ALIGNED(16, DCTELEM, block)[6][64]; 00049 uint8_t *bitstream_buffer; 00050 unsigned int bitstream_buffer_size; 00051 int block_last_index[6]; 00052 } MDECContext; 00053 00054 //very similar to MPEG-1 00055 static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n) 00056 { 00057 int level, diff, i, j, run; 00058 int component; 00059 RLTable *rl = &ff_rl_mpeg1; 00060 uint8_t * const scantable= a->scantable.permutated; 00061 const uint16_t *quant_matrix= ff_mpeg1_default_intra_matrix; 00062 const int qscale= a->qscale; 00063 00064 /* DC coefficient */ 00065 if(a->version==2){ 00066 block[0]= 2*get_sbits(&a->gb, 10) + 1024; 00067 }else{ 00068 component = (n <= 3 ? 0 : n - 4 + 1); 00069 diff = decode_dc(&a->gb, component); 00070 if (diff >= 0xffff) 00071 return -1; 00072 a->last_dc[component]+= diff; 00073 block[0] = a->last_dc[component]<<3; 00074 } 00075 00076 i = 0; 00077 { 00078 OPEN_READER(re, &a->gb); 00079 /* now quantify & encode AC coefficients */ 00080 for(;;) { 00081 UPDATE_CACHE(re, &a->gb); 00082 GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); 00083 00084 if(level == 127){ 00085 break; 00086 } else if(level != 0) { 00087 i += run; 00088 j = scantable[i]; 00089 level= (level*qscale*quant_matrix[j])>>3; 00090 level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1); 00091 LAST_SKIP_BITS(re, &a->gb, 1); 00092 } else { 00093 /* escape */ 00094 run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6); 00095 UPDATE_CACHE(re, &a->gb); 00096 level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10); 00097 i += run; 00098 j = scantable[i]; 00099 if(level<0){ 00100 level= -level; 00101 level= (level*qscale*quant_matrix[j])>>3; 00102 level= (level-1)|1; 00103 level= -level; 00104 }else{ 00105 level= (level*qscale*quant_matrix[j])>>3; 00106 level= (level-1)|1; 00107 } 00108 } 00109 if (i > 63){ 00110 av_log(a->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y); 00111 return -1; 00112 } 00113 00114 block[j] = level; 00115 } 00116 CLOSE_READER(re, &a->gb); 00117 } 00118 a->block_last_index[n] = i; 00119 return 0; 00120 } 00121 00122 static inline int decode_mb(MDECContext *a, DCTELEM block[6][64]){ 00123 int i; 00124 const int block_index[6]= {5,4,0,1,2,3}; 00125 00126 a->dsp.clear_blocks(block[0]); 00127 00128 for(i=0; i<6; i++){ 00129 if( mdec_decode_block_intra(a, block[ block_index[i] ], block_index[i]) < 0 || 00130 get_bits_left(&a->gb) < 0) 00131 return -1; 00132 } 00133 return 0; 00134 } 00135 00136 static inline void idct_put(MDECContext *a, int mb_x, int mb_y){ 00137 DCTELEM (*block)[64]= a->block; 00138 int linesize= a->picture.linesize[0]; 00139 00140 uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16; 00141 uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8; 00142 uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8; 00143 00144 a->dsp.idct_put(dest_y , linesize, block[0]); 00145 a->dsp.idct_put(dest_y + 8, linesize, block[1]); 00146 a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]); 00147 a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]); 00148 00149 if(!(a->avctx->flags&CODEC_FLAG_GRAY)){ 00150 a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]); 00151 a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]); 00152 } 00153 } 00154 00155 static int decode_frame(AVCodecContext *avctx, 00156 void *data, int *data_size, 00157 AVPacket *avpkt) 00158 { 00159 const uint8_t *buf = avpkt->data; 00160 int buf_size = avpkt->size; 00161 MDECContext * const a = avctx->priv_data; 00162 AVFrame *picture = data; 00163 AVFrame * const p= &a->picture; 00164 int i; 00165 00166 if(p->data[0]) 00167 ff_thread_release_buffer(avctx, p); 00168 00169 p->reference= 0; 00170 if(ff_thread_get_buffer(avctx, p) < 0){ 00171 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 00172 return -1; 00173 } 00174 p->pict_type= AV_PICTURE_TYPE_I; 00175 p->key_frame= 1; 00176 00177 av_fast_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); 00178 if (!a->bitstream_buffer) 00179 return AVERROR(ENOMEM); 00180 for(i=0; i<buf_size; i+=2){ 00181 a->bitstream_buffer[i] = buf[i+1]; 00182 a->bitstream_buffer[i+1]= buf[i ]; 00183 } 00184 init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8); 00185 00186 /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */ 00187 skip_bits(&a->gb, 32); 00188 00189 a->qscale= get_bits(&a->gb, 16); 00190 a->version= get_bits(&a->gb, 16); 00191 00192 a->last_dc[0]= 00193 a->last_dc[1]= 00194 a->last_dc[2]= 128; 00195 00196 for(a->mb_x=0; a->mb_x<a->mb_width; a->mb_x++){ 00197 for(a->mb_y=0; a->mb_y<a->mb_height; a->mb_y++){ 00198 if( decode_mb(a, a->block) <0) 00199 return -1; 00200 00201 idct_put(a, a->mb_x, a->mb_y); 00202 } 00203 } 00204 00205 p->quality= a->qscale * FF_QP2LAMBDA; 00206 memset(p->qscale_table, a->qscale, a->mb_width); 00207 00208 *picture = a->picture; 00209 *data_size = sizeof(AVPicture); 00210 00211 return (get_bits_count(&a->gb)+31)/32*4; 00212 } 00213 00214 static av_cold void mdec_common_init(AVCodecContext *avctx){ 00215 MDECContext * const a = avctx->priv_data; 00216 00217 dsputil_init(&a->dsp, avctx); 00218 00219 a->mb_width = (avctx->coded_width + 15) / 16; 00220 a->mb_height = (avctx->coded_height + 15) / 16; 00221 00222 avctx->coded_frame= &a->picture; 00223 a->avctx= avctx; 00224 } 00225 00226 static av_cold int decode_init(AVCodecContext *avctx){ 00227 MDECContext * const a = avctx->priv_data; 00228 AVFrame *p= &a->picture; 00229 00230 mdec_common_init(avctx); 00231 ff_mpeg12_init_vlcs(); 00232 ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_zigzag_direct); 00233 00234 if( avctx->idct_algo == FF_IDCT_AUTO ) 00235 avctx->idct_algo = FF_IDCT_SIMPLE; 00236 p->qstride= 0; 00237 p->qscale_table= av_mallocz(a->mb_width); 00238 avctx->pix_fmt= PIX_FMT_YUVJ420P; 00239 00240 return 0; 00241 } 00242 00243 static av_cold int decode_init_thread_copy(AVCodecContext *avctx){ 00244 MDECContext * const a = avctx->priv_data; 00245 AVFrame *p = (AVFrame*)&a->picture; 00246 00247 avctx->coded_frame = p; 00248 a->avctx= avctx; 00249 00250 p->qscale_table = av_mallocz( a->mb_width); 00251 00252 return 0; 00253 } 00254 00255 static av_cold int decode_end(AVCodecContext *avctx){ 00256 MDECContext * const a = avctx->priv_data; 00257 00258 if(a->picture.data[0]) 00259 avctx->release_buffer(avctx, &a->picture); 00260 av_freep(&a->bitstream_buffer); 00261 av_freep(&a->picture.qscale_table); 00262 a->bitstream_buffer_size=0; 00263 00264 return 0; 00265 } 00266 00267 AVCodec ff_mdec_decoder = { 00268 "mdec", 00269 AVMEDIA_TYPE_VIDEO, 00270 CODEC_ID_MDEC, 00271 sizeof(MDECContext), 00272 decode_init, 00273 NULL, 00274 decode_end, 00275 decode_frame, 00276 CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, 00277 .long_name= NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"), 00278 .init_thread_copy= ONLY_IF_THREADS_ENABLED(decode_init_thread_copy) 00279 }; 00280