59bba9748fcfff0893dce6b3f105782ef27ca77e
[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 "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 {
41 MpegEncContext s;
42 BswapDSPContext bsdsp;
43 void *bitstream_buf;
44 unsigned int bitstream_buf_size;
45 DECLARE_ALIGNED(16, int16_t, block)[6][64];
46 } TqiContext;
47
48 static av_cold int tqi_decode_init(AVCodecContext *avctx)
49 {
50 TqiContext *t = avctx->priv_data;
51 MpegEncContext *s = &t->s;
52 s->avctx = avctx;
53 ff_blockdsp_init(&s->bdsp, avctx);
54 ff_bswapdsp_init(&t->bsdsp);
55 ff_idctdsp_init(&s->idsp, avctx);
56 ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE);
57 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
58 s->qscale = 1;
59 avctx->framerate = (AVRational){ 15, 1 };
60 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
61 ff_mpeg12_init_vlcs();
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 int ret = ff_mpeg1_decode_block_intra(&s->gb,
71 s->intra_matrix,
72 s->intra_scantable.permutated,
73 s->last_dc, block[n], n, 1);
74 if (ret < 0)
75 return -1;
76 }
77
78 return 0;
79 }
80
81 static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64])
82 {
83 MpegEncContext *s = &t->s;
84 int linesize = frame->linesize[0];
85 uint8_t *dest_y = frame->data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16;
86 uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8;
87 uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8;
88
89 ff_ea_idct_put_c(dest_y , linesize, block[0]);
90 ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
91 ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
92 ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
93 if(!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
94 ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
95 ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
96 }
97 }
98
99 static void tqi_calculate_qtable(MpegEncContext *s, int quant)
100 {
101 const int qscale = (215 - 2*quant)*5;
102 int i;
103 s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
104 for(i=1; i<64; i++)
105 s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
106 }
107
108 static int tqi_decode_frame(AVCodecContext *avctx,
109 void *data, int *got_frame,
110 AVPacket *avpkt)
111 {
112 const uint8_t *buf = avpkt->data;
113 int buf_size = avpkt->size;
114 const uint8_t *buf_end = buf+buf_size;
115 TqiContext *t = avctx->priv_data;
116 MpegEncContext *s = &t->s;
117 AVFrame *frame = data;
118 int ret;
119
120 s->width = AV_RL16(&buf[0]);
121 s->height = AV_RL16(&buf[2]);
122 tqi_calculate_qtable(s, buf[4]);
123 buf += 8;
124
125 ret = ff_set_dimensions(s->avctx, s->width, s->height);
126 if (ret < 0)
127 return ret;
128
129 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
130 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
131 return ret;
132 }
133
134 av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
135 buf_end - buf);
136 if (!t->bitstream_buf)
137 return AVERROR(ENOMEM);
138 t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
139 (buf_end - buf) / 4);
140 init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
141
142 s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
143 for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
144 for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
145 {
146 if (tqi_decode_mb(s, t->block) < 0)
147 break;
148 tqi_idct_put(t, frame, t->block);
149 }
150
151 *got_frame = 1;
152 return buf_size;
153 }
154
155 static av_cold int tqi_decode_end(AVCodecContext *avctx)
156 {
157 TqiContext *t = avctx->priv_data;
158 av_free(t->bitstream_buf);
159 return 0;
160 }
161
162 AVCodec ff_eatqi_decoder = {
163 .name = "eatqi",
164 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
165 .type = AVMEDIA_TYPE_VIDEO,
166 .id = AV_CODEC_ID_TQI,
167 .priv_data_size = sizeof(TqiContext),
168 .init = tqi_decode_init,
169 .close = tqi_decode_end,
170 .decode = tqi_decode_frame,
171 .capabilities = AV_CODEC_CAP_DR1,
172 };