2 * Electronic Arts TQI Video Decoder
3 * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
5 * This file is part of Libav.
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.
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.
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
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
33 #include "aandcttab.h"
39 typedef struct TqiContext
{
42 BswapDSPContext bsdsp
;
44 ScanTable intra_scantable
;
47 unsigned int bitstream_buf_size
;
50 uint16_t intra_matrix
[64];
53 DECLARE_ALIGNED(16, int16_t, block
)[6][64];
56 static av_cold
int tqi_decode_init(AVCodecContext
*avctx
)
58 TqiContext
*t
= avctx
->priv_data
;
60 ff_blockdsp_init(&t
->bdsp
, avctx
);
61 ff_bswapdsp_init(&t
->bsdsp
);
62 ff_idctdsp_init(&t
->idsp
, avctx
);
63 ff_init_scantable_permutation(t
->idsp
.idct_permutation
, FF_IDCT_PERM_NONE
);
64 ff_init_scantable(t
->idsp
.idct_permutation
, &t
->intra_scantable
, ff_zigzag_direct
);
66 avctx
->framerate
= (AVRational
){ 15, 1 };
67 avctx
->pix_fmt
= AV_PIX_FMT_YUV420P
;
68 ff_mpeg12_init_vlcs();
72 static int tqi_decode_mb(TqiContext
*t
, int16_t (*block
)[64])
76 t
->bdsp
.clear_blocks(block
[0]);
77 for (n
= 0; n
< 6; n
++) {
78 int ret
= ff_mpeg1_decode_block_intra(&t
->gb
,
80 t
->intra_scantable
.permutated
,
81 t
->last_dc
, block
[n
], n
, 1);
89 static inline void tqi_idct_put(AVCodecContext
*avctx
, AVFrame
*frame
,
92 TqiContext
*t
= avctx
->priv_data
;
93 int linesize
= frame
->linesize
[0];
94 uint8_t *dest_y
= frame
->data
[0] + t
->mb_y
* 16 * linesize
+ t
->mb_x
* 16;
95 uint8_t *dest_cb
= frame
->data
[1] + t
->mb_y
* 8 * frame
->linesize
[1] + t
->mb_x
* 8;
96 uint8_t *dest_cr
= frame
->data
[2] + t
->mb_y
* 8 * frame
->linesize
[2] + t
->mb_x
* 8;
98 ff_ea_idct_put_c(dest_y
, linesize
, block
[0]);
99 ff_ea_idct_put_c(dest_y
+ 8, linesize
, block
[1]);
100 ff_ea_idct_put_c(dest_y
+ 8*linesize
, linesize
, block
[2]);
101 ff_ea_idct_put_c(dest_y
+ 8*linesize
+ 8, linesize
, block
[3]);
103 if (!(avctx
->flags
& AV_CODEC_FLAG_GRAY
)) {
104 ff_ea_idct_put_c(dest_cb
, frame
->linesize
[1], block
[4]);
105 ff_ea_idct_put_c(dest_cr
, frame
->linesize
[2], block
[5]);
109 static void tqi_calculate_qtable(TqiContext
*t
, int quant
)
111 const int qscale
= (215 - 2*quant
)*5;
114 t
->intra_matrix
[0] = (ff_inv_aanscales
[0] * ff_mpeg1_default_intra_matrix
[0]) >> 11;
116 t
->intra_matrix
[i
] = (ff_inv_aanscales
[i
] * ff_mpeg1_default_intra_matrix
[i
] * qscale
+ 32) >> 14;
119 static int tqi_decode_frame(AVCodecContext
*avctx
,
120 void *data
, int *got_frame
,
123 const uint8_t *buf
= avpkt
->data
;
124 int buf_size
= avpkt
->size
;
125 const uint8_t *buf_end
= buf
+buf_size
;
126 TqiContext
*t
= avctx
->priv_data
;
127 AVFrame
*frame
= data
;
130 w
= AV_RL16(&buf
[0]);
131 h
= AV_RL16(&buf
[2]);
132 tqi_calculate_qtable(t
, buf
[4]);
135 ret
= ff_set_dimensions(avctx
, w
, h
);
139 if ((ret
= ff_get_buffer(avctx
, frame
, 0)) < 0) {
140 av_log(avctx
, AV_LOG_ERROR
, "get_buffer() failed\n");
144 av_fast_padded_malloc(&t
->bitstream_buf
, &t
->bitstream_buf_size
,
146 if (!t
->bitstream_buf
)
147 return AVERROR(ENOMEM
);
148 t
->bsdsp
.bswap_buf(t
->bitstream_buf
, (const uint32_t *) buf
,
149 (buf_end
- buf
) / 4);
150 init_get_bits(&t
->gb
, t
->bitstream_buf
, 8 * (buf_end
- buf
));
155 for (t
->mb_y
= 0; t
->mb_y
< (h
+ 15) / 16; t
->mb_y
++) {
156 for (t
->mb_x
= 0; t
->mb_x
< (w
+ 15) / 16; t
->mb_x
++) {
157 if (tqi_decode_mb(t
, t
->block
) < 0)
159 tqi_idct_put(avctx
, frame
, t
->block
);
167 static av_cold
int tqi_decode_end(AVCodecContext
*avctx
)
169 TqiContext
*t
= avctx
->priv_data
;
170 av_free(t
->bitstream_buf
);
174 AVCodec ff_eatqi_decoder
= {
176 .long_name
= NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
177 .type
= AVMEDIA_TYPE_VIDEO
,
178 .id
= AV_CODEC_ID_TQI
,
179 .priv_data_size
= sizeof(TqiContext
),
180 .init
= tqi_decode_init
,
181 .close
= tqi_decode_end
,
182 .decode
= tqi_decode_frame
,
183 .capabilities
= AV_CODEC_CAP_DR1
,