eatqi.c
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1 /*
2  * Electronic Arts TQI Video Decoder
3  * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
29 #include "avcodec.h"
30 #include "get_bits.h"
31 #include "dsputil.h"
32 #include "aandcttab.h"
33 #include "mpeg12.h"
34 #include "mpegvideo.h"
35 
36 typedef struct TqiContext {
40  unsigned int bitstream_buf_size;
42 } TqiContext;
43 
45 {
46  TqiContext *t = avctx->priv_data;
47  MpegEncContext *s = &t->s;
48  s->avctx = avctx;
49  if(avctx->idct_algo==FF_IDCT_AUTO)
50  avctx->idct_algo=FF_IDCT_EA;
51  dsputil_init(&s->dsp, avctx);
53  s->qscale = 1;
54  avctx->time_base = (AVRational){1, 15};
55  avctx->pix_fmt = PIX_FMT_YUV420P;
57  return 0;
58 }
59 
60 static int tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
61 {
62  int n;
63  s->dsp.clear_blocks(block[0]);
64  for (n=0; n<6; n++)
65  if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
66  return -1;
67 
68  return 0;
69 }
70 
71 static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
72 {
73  MpegEncContext *s = &t->s;
74  int linesize= t->frame.linesize[0];
75  uint8_t *dest_y = t->frame.data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16;
76  uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
77  uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8;
78 
79  s->dsp.idct_put(dest_y , linesize, block[0]);
80  s->dsp.idct_put(dest_y + 8, linesize, block[1]);
81  s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
82  s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
83  if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
84  s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]);
85  s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
86  }
87 }
88 
90 {
91  const int qscale = (215 - 2*quant)*5;
92  int i;
93  if (s->avctx->idct_algo==FF_IDCT_EA) {
95  for(i=1; i<64; i++)
96  s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
97  }else{
99  for(i=1; i<64; i++)
100  s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
101  }
102 }
103 
105  void *data, int *data_size,
106  AVPacket *avpkt)
107 {
108  const uint8_t *buf = avpkt->data;
109  int buf_size = avpkt->size;
110  const uint8_t *buf_end = buf+buf_size;
111  TqiContext *t = avctx->priv_data;
112  MpegEncContext *s = &t->s;
113 
114  s->width = AV_RL16(&buf[0]);
115  s->height = AV_RL16(&buf[2]);
116  tqi_calculate_qtable(s, buf[4]);
117  buf += 8;
118 
119  if (t->frame.data[0])
120  avctx->release_buffer(avctx, &t->frame);
121 
122  if (s->avctx->width!=s->width || s->avctx->height!=s->height)
124 
125  if(avctx->get_buffer(avctx, &t->frame) < 0) {
126  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
127  return -1;
128  }
129 
131  if (!t->bitstream_buf)
132  return AVERROR(ENOMEM);
133  s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
134  init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
135 
136  s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
137  for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
138  for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
139  {
140  if (tqi_decode_mb(s, t->block) < 0)
141  break;
142  tqi_idct_put(t, t->block);
143  }
144 
145  *data_size = sizeof(AVFrame);
146  *(AVFrame*)data = t->frame;
147  return buf_size;
148 }
149 
151 {
152  TqiContext *t = avctx->priv_data;
153  if(t->frame.data[0])
154  avctx->release_buffer(avctx, &t->frame);
156  return 0;
157 }
158 
160  .name = "eatqi",
161  .type = AVMEDIA_TYPE_VIDEO,
162  .id = CODEC_ID_TQI,
163  .priv_data_size = sizeof(TqiContext),
167  .capabilities = CODEC_CAP_DR1,
168  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
169 };