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00031 #include "avcodec.h"
00032 #define ALT_BITSTREAM_READER_LE
00033 #include "get_bits.h"
00034 #include "bytestream.h"
00035 #include "dsputil.h"
00036 #include "aandcttab.h"
00037
00038 typedef struct TgqContext {
00039 AVCodecContext *avctx;
00040 DSPContext dsp;
00041 AVFrame frame;
00042 int width,height;
00043 ScanTable scantable;
00044 int qtable[64];
00045 DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
00046 } TgqContext;
00047
00048 static av_cold int tgq_decode_init(AVCodecContext *avctx){
00049 TgqContext *s = avctx->priv_data;
00050 s->avctx = avctx;
00051 if(avctx->idct_algo==FF_IDCT_AUTO)
00052 avctx->idct_algo=FF_IDCT_EA;
00053 dsputil_init(&s->dsp, avctx);
00054 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
00055 avctx->time_base = (AVRational){1, 15};
00056 avctx->pix_fmt = PIX_FMT_YUV420P;
00057 return 0;
00058 }
00059
00060 static void tgq_decode_block(TgqContext *s, DCTELEM block[64], GetBitContext *gb){
00061 uint8_t *perm = s->scantable.permutated;
00062 int i,j,value;
00063 block[0] = get_sbits(gb,8) * s->qtable[0];
00064 for(i=1; i<64; ) {
00065 switch(show_bits(gb,3)) {
00066 case 4:
00067 block[perm[i++]] = 0;
00068 case 0:
00069 block[perm[i++]] = 0;
00070 skip_bits(gb,3);
00071 break;
00072 case 5:
00073 case 1:
00074 skip_bits(gb,2);
00075 value = get_bits(gb,6);
00076 for(j=0; j<value; j++)
00077 block[perm[i++]] = 0;
00078 break;
00079 case 6:
00080 skip_bits(gb,3);
00081 block[perm[i]] = -s->qtable[perm[i]];
00082 i++;
00083 break;
00084 case 2:
00085 skip_bits(gb,3);
00086 block[perm[i]] = s->qtable[perm[i]];
00087 i++;
00088 break;
00089 case 7:
00090 case 3:
00091 skip_bits(gb,2);
00092 if (show_bits(gb,6)==0x3F) {
00093 skip_bits(gb, 6);
00094 block[perm[i]] = get_sbits(gb,8)*s->qtable[perm[i]];
00095 }else{
00096 block[perm[i]] = get_sbits(gb,6)*s->qtable[perm[i]];
00097 }
00098 i++;
00099 break;
00100 }
00101 }
00102 block[0] += 128<<4;
00103 }
00104
00105 static void tgq_idct_put_mb(TgqContext *s, DCTELEM (*block)[64], int mb_x, int mb_y){
00106 int linesize= s->frame.linesize[0];
00107 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
00108 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
00109 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
00110
00111 s->dsp.idct_put(dest_y , linesize, block[0]);
00112 s->dsp.idct_put(dest_y + 8, linesize, block[1]);
00113 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
00114 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
00115 if(!(s->avctx->flags&CODEC_FLAG_GRAY)){
00116 s->dsp.idct_put(dest_cb, s->frame.linesize[1], block[4]);
00117 s->dsp.idct_put(dest_cr, s->frame.linesize[2], block[5]);
00118 }
00119 }
00120
00121 static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc){
00122 int level = av_clip_uint8((dc*s->qtable[0] + 2056)>>4);
00123 int j;
00124 for(j=0;j<8;j++)
00125 memset(dst+j*dst_stride, level, 8);
00126 }
00127
00128 static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc)
00129 {
00130 int linesize= s->frame.linesize[0];
00131 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
00132 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
00133 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
00134 tgq_dconly(s,dest_y , linesize, dc[0]);
00135 tgq_dconly(s,dest_y + 8, linesize, dc[1]);
00136 tgq_dconly(s,dest_y + 8*linesize , linesize, dc[2]);
00137 tgq_dconly(s,dest_y + 8*linesize + 8, linesize, dc[3]);
00138 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
00139 tgq_dconly(s,dest_cb, s->frame.linesize[1], dc[4]);
00140 tgq_dconly(s,dest_cr, s->frame.linesize[2], dc[5]);
00141 }
00142 }
00143
00144 static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x, const uint8_t **bs, const uint8_t *buf_end){
00145 int mode;
00146 int i;
00147 int8_t dc[6];
00148
00149 mode = bytestream_get_byte(bs);
00150 if (mode>buf_end-*bs) {
00151 av_log(s->avctx, AV_LOG_ERROR, "truncated macroblock\n");
00152 return;
00153 }
00154
00155 if (mode>12) {
00156 GetBitContext gb;
00157 init_get_bits(&gb, *bs, mode*8);
00158 for(i=0; i<6; i++)
00159 tgq_decode_block(s, s->block[i], &gb);
00160 tgq_idct_put_mb(s, s->block, mb_x, mb_y);
00161 }else{
00162 if (mode==3) {
00163 memset(dc, (*bs)[0], 4);
00164 dc[4] = (*bs)[1];
00165 dc[5] = (*bs)[2];
00166 }else if (mode==6) {
00167 memcpy(dc, *bs, 6);
00168 }else if (mode==12) {
00169 for(i=0; i<6; i++)
00170 dc[i] = (*bs)[i*2];
00171 }else{
00172 av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
00173 }
00174 tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc);
00175 }
00176 *bs += mode;
00177 }
00178
00179 static void tgq_calculate_qtable(TgqContext *s, int quant){
00180 int i,j;
00181 const int a = (14*(100-quant))/100 + 1;
00182 const int b = (11*(100-quant))/100 + 4;
00183 for(j=0;j<8;j++)
00184 for(i=0;i<8;i++)
00185 if (s->avctx->idct_algo==FF_IDCT_EA)
00186 s->qtable[j*8+i] = ((a*(j+i)/(7+7) + b)*ff_inv_aanscales[j*8+i])>>(14-4);
00187 else
00188 s->qtable[j*8+i] = (a*(j+i)/(7+7) + b)<<3;
00189 }
00190
00191 static int tgq_decode_frame(AVCodecContext *avctx,
00192 void *data, int *data_size,
00193 AVPacket *avpkt){
00194 const uint8_t *buf = avpkt->data;
00195 int buf_size = avpkt->size;
00196 const uint8_t *buf_start = buf;
00197 const uint8_t *buf_end = buf + buf_size;
00198 TgqContext *s = avctx->priv_data;
00199 int x,y;
00200
00201 int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
00202 buf += 8;
00203
00204 if(8>buf_end-buf) {
00205 av_log(avctx, AV_LOG_WARNING, "truncated header\n");
00206 return -1;
00207 }
00208 s->width = big_endian ? AV_RB16(&buf[0]) : AV_RL16(&buf[0]);
00209 s->height = big_endian ? AV_RB16(&buf[2]) : AV_RL16(&buf[2]);
00210
00211 if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
00212 avcodec_set_dimensions(s->avctx, s->width, s->height);
00213 if (s->frame.data[0])
00214 avctx->release_buffer(avctx, &s->frame);
00215 }
00216 tgq_calculate_qtable(s, buf[4]);
00217 buf += 8;
00218
00219 if (!s->frame.data[0]) {
00220 s->frame.key_frame = 1;
00221 s->frame.pict_type = AV_PICTURE_TYPE_I;
00222 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
00223 if (avctx->get_buffer(avctx, &s->frame)) {
00224 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00225 return -1;
00226 }
00227 }
00228
00229 for (y=0; y<(avctx->height+15)/16; y++)
00230 for (x=0; x<(avctx->width+15)/16; x++)
00231 tgq_decode_mb(s, y, x, &buf, buf_end);
00232
00233 *data_size = sizeof(AVFrame);
00234 *(AVFrame*)data = s->frame;
00235
00236 return buf-buf_start;
00237 }
00238
00239 static av_cold int tgq_decode_end(AVCodecContext *avctx){
00240 TgqContext *s = avctx->priv_data;
00241 if (s->frame.data[0])
00242 s->avctx->release_buffer(avctx, &s->frame);
00243 return 0;
00244 }
00245
00246 AVCodec ff_eatgq_decoder = {
00247 "eatgq",
00248 AVMEDIA_TYPE_VIDEO,
00249 CODEC_ID_TGQ,
00250 sizeof(TgqContext),
00251 tgq_decode_init,
00252 NULL,
00253 tgq_decode_end,
00254 tgq_decode_frame,
00255 CODEC_CAP_DR1,
00256 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
00257 };
