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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 "blockdsp.h"
31 #include "bswapdsp.h"
32 #include "get_bits.h"
33 #include "aandcttab.h"
34 #include "eaidct.h"
35 #include "idctdsp.h"
36 #include "internal.h"
37 #include "mpeg12.h"
38 #include "mpegvideo.h"
39 
40 typedef struct TqiContext {
44  unsigned int bitstream_buf_size;
45  DECLARE_ALIGNED(16, int16_t, block)[6][64];
46 } TqiContext;
47 
49 {
50  TqiContext *t = avctx->priv_data;
51  MpegEncContext *s = &t->s;
52  s->avctx = avctx;
53  ff_blockdsp_init(&s->bdsp, avctx);
55  ff_idctdsp_init(&s->idsp, avctx);
58  s->qscale = 1;
59  avctx->framerate = (AVRational){ 15, 1 };
60  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
62  return 0;
63 }
64 
65 static int tqi_decode_mb(MpegEncContext *s, int16_t (*block)[64])
66 {
67  int n;
68  s->bdsp.clear_blocks(block[0]);
69  for (n=0; n<6; n++)
70  if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
71  return -1;
72 
73  return 0;
74 }
75 
76 static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64])
77 {
78  MpegEncContext *s = &t->s;
79  int linesize = frame->linesize[0];
80  uint8_t *dest_y = frame->data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16;
81  uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8;
82  uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8;
83 
84  ff_ea_idct_put_c(dest_y , linesize, block[0]);
85  ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
86  ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
87  ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
88  if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
89  ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
90  ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
91  }
92 }
93 
95 {
96  const int qscale = (215 - 2*quant)*5;
97  int i;
99  for(i=1; i<64; i++)
100  s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
101 }
102 
104  void *data, int *got_frame,
105  AVPacket *avpkt)
106 {
107  const uint8_t *buf = avpkt->data;
108  int buf_size = avpkt->size;
109  const uint8_t *buf_end = buf+buf_size;
110  TqiContext *t = avctx->priv_data;
111  MpegEncContext *s = &t->s;
112  AVFrame *frame = data;
113  int ret;
114 
115  s->width = AV_RL16(&buf[0]);
116  s->height = AV_RL16(&buf[2]);
117  tqi_calculate_qtable(s, buf[4]);
118  buf += 8;
119 
120  ret = ff_set_dimensions(s->avctx, s->width, s->height);
121  if (ret < 0)
122  return ret;
123 
124  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
125  return ret;
126 
128  buf_end - buf);
129  if (!t->bitstream_buf)
130  return AVERROR(ENOMEM);
131  t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
132  (buf_end - buf) / 4);
133  init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
134 
135  s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
136  for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
137  for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
138  {
139  if (tqi_decode_mb(s, t->block) < 0)
140  goto end;
141  tqi_idct_put(t, frame, t->block);
142  }
143  end:
144 
145  *got_frame = 1;
146  return buf_size;
147 }
148 
150 {
151  TqiContext *t = avctx->priv_data;
152  av_freep(&t->bitstream_buf);
153  return 0;
154 }
155 
157  .name = "eatqi",
158  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
159  .type = AVMEDIA_TYPE_VIDEO,
160  .id = AV_CODEC_ID_TQI,
161  .priv_data_size = sizeof(TqiContext),
163  .close = tqi_decode_end,
165  .capabilities = CODEC_CAP_DR1,
166 };