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 eatqi.c
24 * Electronic Arts TQI Video Decoder
25 * by Peter Ross <pross@xvid.org>
26 *
27 * Technical details here:
28 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
29 */
30
31#include "avcodec.h"
32#include "bitstream.h"
33#include "dsputil.h"
34#include "aandcttab.h"
35#include "mpeg12.h"
36#include "mpegvideo.h"
37
38typedef struct TqiContext {
39    MpegEncContext s;
40    AVFrame frame;
41    uint8_t *bitstream_buf;
42    unsigned int bitstream_buf_size;
43} TqiContext;
44
45static 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    if(avctx->idct_algo==FF_IDCT_AUTO)
51        avctx->idct_algo=FF_IDCT_EA;
52    dsputil_init(&s->dsp, avctx);
53    ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
54    s->qscale = 1;
55    avctx->time_base = (AVRational){1, 15};
56    avctx->pix_fmt = PIX_FMT_YUV420P;
57    ff_mpeg12_init_vlcs();
58    return 0;
59}
60
61static void tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
62{
63    int n;
64    s->dsp.clear_blocks(block[0]);
65    for (n=0; n<6; n++)
66        ff_mpeg1_decode_block_intra(s, block[n], n);
67}
68
69static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
70{
71    MpegEncContext *s = &t->s;
72    int linesize= t->frame.linesize[0];
73    uint8_t *dest_y  = t->frame.data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
74    uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
75    uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8;
76
77    s->dsp.idct_put(dest_y                 , linesize, block[0]);
78    s->dsp.idct_put(dest_y              + 8, linesize, block[1]);
79    s->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
80    s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
81    if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
82        s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]);
83        s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
84    }
85}
86
87static void tqi_calculate_qtable(MpegEncContext *s, int quant)
88{
89    const int qscale = (215 - 2*quant)*5;
90    int i;
91    if (s->avctx->idct_algo==FF_IDCT_EA) {
92        s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
93        for(i=1; i<64; i++)
94            s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
95    }else{
96        s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
97        for(i=1; i<64; i++)
98            s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
99    }
100}
101
102static int tqi_decode_frame(AVCodecContext *avctx,
103                            void *data, int *data_size,
104                            const uint8_t *buf, int buf_size)
105{
106    const uint8_t *buf_end = buf+buf_size;
107    TqiContext *t = avctx->priv_data;
108    MpegEncContext *s = &t->s;
109    DECLARE_ALIGNED_16(DCTELEM, block[6][64]);
110
111    s->width  = AV_RL16(&buf[0]);
112    s->height = AV_RL16(&buf[2]);
113    tqi_calculate_qtable(s, buf[4]);
114    buf += 8;
115
116    if (t->frame.data[0])
117        avctx->release_buffer(avctx, &t->frame);
118
119    if (s->avctx->width!=s->width || s->avctx->height!=s->height)
120        avcodec_set_dimensions(s->avctx, s->width, s->height);
121
122    if(avctx->get_buffer(avctx, &t->frame) < 0) {
123        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
124        return -1;
125    }
126
127    t->bitstream_buf = av_fast_realloc(t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
128    if (!t->bitstream_buf)
129        return -1;
130    s->dsp.bswap_buf((uint32_t*)t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
131    init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
132
133    s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
134    for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
135    for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
136    {
137        tqi_decode_mb(s, block);
138        tqi_idct_put(t, block);
139    }
140
141    *data_size = sizeof(AVFrame);
142    *(AVFrame*)data = t->frame;
143    return buf_size;
144}
145
146static av_cold int tqi_decode_end(AVCodecContext *avctx)
147{
148    TqiContext *t = avctx->priv_data;
149    if(t->frame.data[0])
150        avctx->release_buffer(avctx, &t->frame);
151    av_free(t->bitstream_buf);
152    return 0;
153}
154
155AVCodec eatqi_decoder = {
156    "eatqi",
157    CODEC_TYPE_VIDEO,
158    CODEC_ID_TQI,
159    sizeof(TqiContext),
160    tqi_decode_init,
161    NULL,
162    tqi_decode_end,
163    tqi_decode_frame,
164    CODEC_CAP_DR1,
165    .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
166};
167