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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 FFmpeg.
6  *
7  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Electronic Arts TQI Video Decoder
25  * @author Peter Ross <pross@xvid.org>
26  * @see http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
27  */
28 
29 #include "avcodec.h"
30 #include "get_bits.h"
31 #include "aandcttab.h"
32 #include "eaidct.h"
33 #include "internal.h"
34 #include "mpeg12.h"
35 #include "mpegvideo.h"
36 
37 typedef struct TqiContext {
40  unsigned int bitstream_buf_size;
41  DECLARE_ALIGNED(16, int16_t, block)[6][64];
42 } TqiContext;
43 
45 {
46  TqiContext *t = avctx->priv_data;
47  MpegEncContext *s = &t->s;
48  s->avctx = avctx;
49  ff_dsputil_init(&s->dsp, avctx);
52  s->qscale = 1;
53  avctx->time_base = (AVRational){1, 15};
54  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
56  return 0;
57 }
58 
59 static int tqi_decode_mb(MpegEncContext *s, int16_t (*block)[64])
60 {
61  int n;
62  s->dsp.clear_blocks(block[0]);
63  for (n=0; n<6; n++)
64  if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
65  return -1;
66 
67  return 0;
68 }
69 
70 static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64])
71 {
72  MpegEncContext *s = &t->s;
73  int linesize = frame->linesize[0];
74  uint8_t *dest_y = frame->data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16;
75  uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8;
76  uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8;
77 
78  ff_ea_idct_put_c(dest_y , linesize, block[0]);
79  ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
80  ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
81  ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
82  if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
83  ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
84  ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
85  }
86 }
87 
89 {
90  const int qscale = (215 - 2*quant)*5;
91  int i;
93  for(i=1; i<64; i++)
94  s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
95 }
96 
97 static int tqi_decode_frame(AVCodecContext *avctx,
98  void *data, int *got_frame,
99  AVPacket *avpkt)
100 {
101  const uint8_t *buf = avpkt->data;
102  int buf_size = avpkt->size;
103  const uint8_t *buf_end = buf+buf_size;
104  TqiContext *t = avctx->priv_data;
105  MpegEncContext *s = &t->s;
106  AVFrame *frame = data;
107  int ret;
108 
109  s->width = AV_RL16(&buf[0]);
110  s->height = AV_RL16(&buf[2]);
111  tqi_calculate_qtable(s, buf[4]);
112  buf += 8;
113 
114  if (s->avctx->width!=s->width || s->avctx->height!=s->height)
116 
117  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
118  return ret;
119 
121  buf_end - buf);
122  if (!t->bitstream_buf)
123  return AVERROR(ENOMEM);
124  s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
125  init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
126 
127  s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
128  for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
129  for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
130  {
131  if (tqi_decode_mb(s, t->block) < 0)
132  goto end;
133  tqi_idct_put(t, frame, t->block);
134  }
135  end:
136 
137  *got_frame = 1;
138  return buf_size;
139 }
140 
142 {
143  TqiContext *t = avctx->priv_data;
145  return 0;
146 }
147 
149  .name = "eatqi",
150  .type = AVMEDIA_TYPE_VIDEO,
151  .id = AV_CODEC_ID_TQI,
152  .priv_data_size = sizeof(TqiContext),
156  .capabilities = CODEC_CAP_DR1,
157  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
158 };