caf92366e1e9c517738df3ecb33ea372e327c703
[libav.git] / libavcodec / eatqi.c
1 /*
2 * Electronic Arts TQI Video Decoder
3 * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
4 *
5 * This file is part of Libav.
6 *
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.
11 *
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.
16 *
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
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 {
38 MpegEncContext s;
39 AVFrame frame;
40 void *bitstream_buf;
41 unsigned int bitstream_buf_size;
42 DECLARE_ALIGNED(16, int16_t, block)[6][64];
43 } TqiContext;
44
45 static av_cold int tqi_decode_init(AVCodecContext *avctx)
46 {
47 TqiContext *t = avctx->priv_data;
48 MpegEncContext *s = &t->s;
49 s->avctx = avctx;
50 ff_dsputil_init(&s->dsp, avctx);
51 ff_init_scantable_permutation(s->dsp.idct_permutation, FF_NO_IDCT_PERM);
52 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
53 s->qscale = 1;
54 avctx->time_base = (AVRational){1, 15};
55 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
56 ff_mpeg12_init_vlcs();
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
89 static void tqi_calculate_qtable(MpegEncContext *s, int quant)
90 {
91 const int qscale = (215 - 2*quant)*5;
92 int i;
93 s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
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)
117 avcodec_set_dimensions(s->avctx, s->width, 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
124 av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
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 break;
137 tqi_idct_put(t, t->block);
138 }
139
140 *got_frame = 1;
141 *(AVFrame*)data = t->frame;
142 return buf_size;
143 }
144
145 static av_cold int tqi_decode_end(AVCodecContext *avctx)
146 {
147 TqiContext *t = avctx->priv_data;
148 if(t->frame.data[0])
149 avctx->release_buffer(avctx, &t->frame);
150 av_free(t->bitstream_buf);
151 return 0;
152 }
153
154 AVCodec ff_eatqi_decoder = {
155 .name = "eatqi",
156 .type = AVMEDIA_TYPE_VIDEO,
157 .id = AV_CODEC_ID_TQI,
158 .priv_data_size = sizeof(TqiContext),
159 .init = tqi_decode_init,
160 .close = tqi_decode_end,
161 .decode = tqi_decode_frame,
162 .capabilities = CODEC_CAP_DR1,
163 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
164 };