00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00031 #include "avcodec.h"
00032 #include "get_bits.h"
00033 #include "dsputil.h"
00034 #include "aandcttab.h"
00035 #include "mpeg12.h"
00036 #include "mpegvideo.h"
00037
00038 typedef struct TqiContext {
00039 MpegEncContext s;
00040 AVFrame frame;
00041 void *bitstream_buf;
00042 unsigned int bitstream_buf_size;
00043 DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
00044 } TqiContext;
00045
00046 static av_cold int tqi_decode_init(AVCodecContext *avctx)
00047 {
00048 TqiContext *t = avctx->priv_data;
00049 MpegEncContext *s = &t->s;
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->intra_scantable, ff_zigzag_direct);
00055 s->qscale = 1;
00056 avctx->time_base = (AVRational){1, 15};
00057 avctx->pix_fmt = PIX_FMT_YUV420P;
00058 ff_mpeg12_init_vlcs();
00059 return 0;
00060 }
00061
00062 static void tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
00063 {
00064 int n;
00065 s->dsp.clear_blocks(block[0]);
00066 for (n=0; n<6; n++)
00067 ff_mpeg1_decode_block_intra(s, block[n], n);
00068 }
00069
00070 static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
00071 {
00072 MpegEncContext *s = &t->s;
00073 int linesize= t->frame.linesize[0];
00074 uint8_t *dest_y = t->frame.data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16;
00075 uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
00076 uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8;
00077
00078 s->dsp.idct_put(dest_y , linesize, block[0]);
00079 s->dsp.idct_put(dest_y + 8, linesize, block[1]);
00080 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
00081 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
00082 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
00083 s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]);
00084 s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
00085 }
00086 }
00087
00088 static void tqi_calculate_qtable(MpegEncContext *s, int quant)
00089 {
00090 const int qscale = (215 - 2*quant)*5;
00091 int i;
00092 if (s->avctx->idct_algo==FF_IDCT_EA) {
00093 s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
00094 for(i=1; i<64; i++)
00095 s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
00096 }else{
00097 s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
00098 for(i=1; i<64; i++)
00099 s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
00100 }
00101 }
00102
00103 static int tqi_decode_frame(AVCodecContext *avctx,
00104 void *data, int *data_size,
00105 AVPacket *avpkt)
00106 {
00107 const uint8_t *buf = avpkt->data;
00108 int buf_size = avpkt->size;
00109 const uint8_t *buf_end = buf+buf_size;
00110 TqiContext *t = avctx->priv_data;
00111 MpegEncContext *s = &t->s;
00112
00113 s->width = AV_RL16(&buf[0]);
00114 s->height = AV_RL16(&buf[2]);
00115 tqi_calculate_qtable(s, buf[4]);
00116 buf += 8;
00117
00118 if (t->frame.data[0])
00119 avctx->release_buffer(avctx, &t->frame);
00120
00121 if (s->avctx->width!=s->width || s->avctx->height!=s->height)
00122 avcodec_set_dimensions(s->avctx, s->width, s->height);
00123
00124 if(avctx->get_buffer(avctx, &t->frame) < 0) {
00125 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00126 return -1;
00127 }
00128
00129 av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
00130 if (!t->bitstream_buf)
00131 return AVERROR(ENOMEM);
00132 s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
00133 init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
00134
00135 s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
00136 for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
00137 for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
00138 {
00139 tqi_decode_mb(s, t->block);
00140 tqi_idct_put(t, t->block);
00141 }
00142
00143 *data_size = sizeof(AVFrame);
00144 *(AVFrame*)data = t->frame;
00145 return buf_size;
00146 }
00147
00148 static av_cold int tqi_decode_end(AVCodecContext *avctx)
00149 {
00150 TqiContext *t = avctx->priv_data;
00151 if(t->frame.data[0])
00152 avctx->release_buffer(avctx, &t->frame);
00153 av_free(t->bitstream_buf);
00154 return 0;
00155 }
00156
00157 AVCodec eatqi_decoder = {
00158 "eatqi",
00159 AVMEDIA_TYPE_VIDEO,
00160 CODEC_ID_TQI,
00161 sizeof(TqiContext),
00162 tqi_decode_init,
00163 NULL,
00164 tqi_decode_end,
00165 tqi_decode_frame,
00166 CODEC_CAP_DR1,
00167 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
00168 };