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path: root/libavcodec/eatqi.c (plain)
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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
39typedef struct TqiContext {
40 AVCodecContext *avctx;
41 GetBitContext gb;
42 BlockDSPContext bdsp;
43 BswapDSPContext bsdsp;
44 IDCTDSPContext idsp;
45 ScanTable intra_scantable;
46
47 void *bitstream_buf;
48 unsigned int bitstream_buf_size;
49
50 int mb_x, mb_y;
51 uint16_t intra_matrix[64];
52 int last_dc[3];
53
54 DECLARE_ALIGNED(16, int16_t, block)[6][64];
55} TqiContext;
56
57static av_cold int tqi_decode_init(AVCodecContext *avctx)
58{
59 TqiContext *t = avctx->priv_data;
60
61 ff_blockdsp_init(&t->bdsp, avctx);
62 ff_bswapdsp_init(&t->bsdsp);
63 ff_idctdsp_init(&t->idsp, avctx);
64 ff_init_scantable_permutation(t->idsp.idct_permutation, FF_IDCT_PERM_NONE);
65 ff_init_scantable(t->idsp.idct_permutation, &t->intra_scantable, ff_zigzag_direct);
66
67 avctx->framerate = (AVRational){ 15, 1 };
68 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
69 ff_mpeg12_init_vlcs();
70 return 0;
71}
72
73static int tqi_decode_mb(TqiContext *t, int16_t (*block)[64])
74{
75 int n;
76
77 t->bdsp.clear_blocks(block[0]);
78 for (n = 0; n < 6; n++) {
79 int ret = ff_mpeg1_decode_block_intra(&t->gb,
80 t->intra_matrix,
81 t->intra_scantable.permutated,
82 t->last_dc, block[n], n, 1);
83 if (ret < 0) {
84 av_log(t->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
85 t->mb_x, t->mb_y);
86 return -1;
87 }
88 }
89
90 return 0;
91}
92
93static inline void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame,
94 int16_t (*block)[64])
95{
96 TqiContext *t = avctx->priv_data;
97 ptrdiff_t linesize = frame->linesize[0];
98 uint8_t *dest_y = frame->data[0] + t->mb_y * 16 * linesize + t->mb_x * 16;
99 uint8_t *dest_cb = frame->data[1] + t->mb_y * 8 * frame->linesize[1] + t->mb_x * 8;
100 uint8_t *dest_cr = frame->data[2] + t->mb_y * 8 * frame->linesize[2] + t->mb_x * 8;
101
102 ff_ea_idct_put_c(dest_y , linesize, block[0]);
103 ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
104 ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
105 ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
106
107 if (!(avctx->flags & AV_CODEC_FLAG_GRAY)) {
108 ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
109 ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
110 }
111}
112
113static void tqi_calculate_qtable(TqiContext *t, int quant)
114{
115 const int qscale = (215 - 2*quant)*5;
116 int i;
117
118 t->intra_matrix[0] = (ff_inv_aanscales[0] * ff_mpeg1_default_intra_matrix[0]) >> 11;
119 for(i=1; i<64; i++)
120 t->intra_matrix[i] = (ff_inv_aanscales[i] * ff_mpeg1_default_intra_matrix[i] * qscale + 32) >> 14;
121}
122
123static int tqi_decode_frame(AVCodecContext *avctx,
124 void *data, int *got_frame,
125 AVPacket *avpkt)
126{
127 const uint8_t *buf = avpkt->data;
128 int buf_size = avpkt->size;
129 const uint8_t *buf_end = buf+buf_size;
130 TqiContext *t = avctx->priv_data;
131 AVFrame *frame = data;
132 int ret, w, h;
133
134 t->avctx = avctx;
135
136 w = AV_RL16(&buf[0]);
137 h = AV_RL16(&buf[2]);
138 tqi_calculate_qtable(t, buf[4]);
139 buf += 8;
140
141 ret = ff_set_dimensions(avctx, w, h);
142 if (ret < 0)
143 return ret;
144
145 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
146 return ret;
147
148 av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
149 buf_end - buf);
150 if (!t->bitstream_buf)
151 return AVERROR(ENOMEM);
152 t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
153 (buf_end - buf) / 4);
154 init_get_bits(&t->gb, t->bitstream_buf, 8 * (buf_end - buf));
155
156 t->last_dc[0] =
157 t->last_dc[1] =
158 t->last_dc[2] = 0;
159 for (t->mb_y = 0; t->mb_y < (h + 15) / 16; t->mb_y++) {
160 for (t->mb_x = 0; t->mb_x < (w + 15) / 16; t->mb_x++) {
161 if (tqi_decode_mb(t, t->block) < 0)
162 goto end;
163 tqi_idct_put(avctx, frame, t->block);
164 }
165 }
166 end:
167
168 *got_frame = 1;
169 return buf_size;
170}
171
172static av_cold int tqi_decode_end(AVCodecContext *avctx)
173{
174 TqiContext *t = avctx->priv_data;
175 av_freep(&t->bitstream_buf);
176 return 0;
177}
178
179AVCodec ff_eatqi_decoder = {
180 .name = "eatqi",
181 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
182 .type = AVMEDIA_TYPE_VIDEO,
183 .id = AV_CODEC_ID_TQI,
184 .priv_data_size = sizeof(TqiContext),
185 .init = tqi_decode_init,
186 .close = tqi_decode_end,
187 .decode = tqi_decode_frame,
188 .capabilities = AV_CODEC_CAP_DR1,
189};
190
generated by cgit at 2024-05-17 01:49:13 (GMT)