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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 {
41  unsigned int bitstream_buf_size;
42  DECLARE_ALIGNED(16, int16_t, block)[6][64];
43 } TqiContext;
44 
46 {
47  TqiContext *t = avctx->priv_data;
48  MpegEncContext *s = &t->s;
49  s->avctx = avctx;
50  ff_dsputil_init(&s->dsp, avctx);
53  s->qscale = 1;
54  avctx->time_base = (AVRational){1, 15};
55  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
57  return 0;
58 }
59 
60 static int tqi_decode_mb(MpegEncContext *s, int16_t (*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, int16_t (*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  ff_ea_idct_put_c(dest_y , linesize, block[0]);
80  ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
81  ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
82  ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
83  if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
84  ff_ea_idct_put_c(dest_cb, t->frame.linesize[1], block[4]);
85  ff_ea_idct_put_c(dest_cr, t->frame.linesize[2], block[5]);
86  }
87 }
88 
90 {
91  const int qscale = (215 - 2*quant)*5;
92  int i;
94  for(i=1; i<64; i++)
95  s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
96 }
97 
98 static int tqi_decode_frame(AVCodecContext *avctx,
99  void *data, int *got_frame,
100  AVPacket *avpkt)
101 {
102  const uint8_t *buf = avpkt->data;
103  int buf_size = avpkt->size;
104  const uint8_t *buf_end = buf+buf_size;
105  TqiContext *t = avctx->priv_data;
106  MpegEncContext *s = &t->s;
107 
108  s->width = AV_RL16(&buf[0]);
109  s->height = AV_RL16(&buf[2]);
110  tqi_calculate_qtable(s, buf[4]);
111  buf += 8;
112 
113  if (t->frame.data[0])
114  avctx->release_buffer(avctx, &t->frame);
115 
116  if (s->avctx->width!=s->width || s->avctx->height!=s->height)
118 
119  if(ff_get_buffer(avctx, &t->frame) < 0) {
120  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
121  return -1;
122  }
123 
125  buf_end - buf);
126  if (!t->bitstream_buf)
127  return AVERROR(ENOMEM);
128  s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
129  init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
130 
131  s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
132  for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
133  for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
134  {
135  if (tqi_decode_mb(s, t->block) < 0)
136  goto end;
137  tqi_idct_put(t, t->block);
138  }
139  end:
140 
141  *got_frame = 1;
142  *(AVFrame*)data = t->frame;
143  return buf_size;
144 }
145 
147 {
148  TqiContext *t = avctx->priv_data;
149  if(t->frame.data[0])
150  avctx->release_buffer(avctx, &t->frame);
152  return 0;
153 }
154 
156  .name = "eatqi",
157  .type = AVMEDIA_TYPE_VIDEO,
158  .id = AV_CODEC_ID_TQI,
159  .priv_data_size = sizeof(TqiContext),
163  .capabilities = CODEC_CAP_DR1,
164  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
165 };