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00029 #include "avcodec.h"
00030 #include "get_bits.h"
00031 #include "dsputil.h"
00032 #include "aandcttab.h"
00033 #include "mpeg12.h"
00034 #include "mpegvideo.h"
00035
00036 typedef struct TqiContext {
00037 MpegEncContext s;
00038 AVFrame frame;
00039 void *bitstream_buf;
00040 unsigned int bitstream_buf_size;
00041 DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
00042 } TqiContext;
00043
00044 static av_cold int tqi_decode_init(AVCodecContext *avctx)
00045 {
00046 TqiContext *t = avctx->priv_data;
00047 MpegEncContext *s = &t->s;
00048 s->avctx = avctx;
00049 if(avctx->idct_algo==FF_IDCT_AUTO)
00050 avctx->idct_algo=FF_IDCT_EA;
00051 dsputil_init(&s->dsp, avctx);
00052 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
00053 s->qscale = 1;
00054 avctx->time_base = (AVRational){1, 15};
00055 avctx->pix_fmt = PIX_FMT_YUV420P;
00056 ff_mpeg12_init_vlcs();
00057 return 0;
00058 }
00059
00060 static int tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
00061 {
00062 int n;
00063 s->dsp.clear_blocks(block[0]);
00064 for (n=0; n<6; n++)
00065 if(ff_mpeg1_decode_block_intra(s, block[n], n)<0)
00066 return -1;
00067
00068 return 0;
00069 }
00070
00071 static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
00072 {
00073 MpegEncContext *s = &t->s;
00074 int linesize= t->frame.linesize[0];
00075 uint8_t *dest_y = t->frame.data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16;
00076 uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
00077 uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8;
00078
00079 s->dsp.idct_put(dest_y , linesize, block[0]);
00080 s->dsp.idct_put(dest_y + 8, linesize, block[1]);
00081 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
00082 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
00083 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
00084 s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]);
00085 s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
00086 }
00087 }
00088
00089 static void tqi_calculate_qtable(MpegEncContext *s, int quant)
00090 {
00091 const int qscale = (215 - 2*quant)*5;
00092 int i;
00093 if (s->avctx->idct_algo==FF_IDCT_EA) {
00094 s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
00095 for(i=1; i<64; i++)
00096 s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
00097 }else{
00098 s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
00099 for(i=1; i<64; i++)
00100 s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
00101 }
00102 }
00103
00104 static int tqi_decode_frame(AVCodecContext *avctx,
00105 void *data, int *data_size,
00106 AVPacket *avpkt)
00107 {
00108 const uint8_t *buf = avpkt->data;
00109 int buf_size = avpkt->size;
00110 const uint8_t *buf_end = buf+buf_size;
00111 TqiContext *t = avctx->priv_data;
00112 MpegEncContext *s = &t->s;
00113
00114 s->width = AV_RL16(&buf[0]);
00115 s->height = AV_RL16(&buf[2]);
00116 tqi_calculate_qtable(s, buf[4]);
00117 buf += 8;
00118
00119 if (t->frame.data[0])
00120 avctx->release_buffer(avctx, &t->frame);
00121
00122 if (s->avctx->width!=s->width || s->avctx->height!=s->height)
00123 avcodec_set_dimensions(s->avctx, s->width, s->height);
00124
00125 if(avctx->get_buffer(avctx, &t->frame) < 0) {
00126 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00127 return -1;
00128 }
00129
00130 av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
00131 if (!t->bitstream_buf)
00132 return AVERROR(ENOMEM);
00133 s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
00134 init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
00135
00136 s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
00137 for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
00138 for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
00139 {
00140 if(tqi_decode_mb(s, t->block) < 0)
00141 break;
00142 tqi_idct_put(t, t->block);
00143 }
00144
00145 *data_size = sizeof(AVFrame);
00146 *(AVFrame*)data = t->frame;
00147 return buf_size;
00148 }
00149
00150 static av_cold int tqi_decode_end(AVCodecContext *avctx)
00151 {
00152 TqiContext *t = avctx->priv_data;
00153 if(t->frame.data[0])
00154 avctx->release_buffer(avctx, &t->frame);
00155 av_free(t->bitstream_buf);
00156 return 0;
00157 }
00158
00159 AVCodec ff_eatqi_decoder = {
00160 .name = "eatqi",
00161 .type = AVMEDIA_TYPE_VIDEO,
00162 .id = CODEC_ID_TQI,
00163 .priv_data_size = sizeof(TqiContext),
00164 .init = tqi_decode_init,
00165 .close = tqi_decode_end,
00166 .decode = tqi_decode_frame,
00167 .capabilities = CODEC_CAP_DR1,
00168 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
00169 };