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 "dsputil.h"
32#include "aandcttab.h"
33#include "mpeg12.h"
34#include "mpegvideo.h"
35
36typedef struct TqiContext {
37    MpegEncContext s;
38    AVFrame frame;
39    void *bitstream_buf;
40    unsigned int bitstream_buf_size;
41    DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
42} TqiContext;
43
44static av_cold int tqi_decode_init(AVCodecContext *avctx)
45{
46    TqiContext *t = avctx->priv_data;
47    MpegEncContext *s = &t->s;
48    s->avctx = avctx;
49    if(avctx->idct_algo==FF_IDCT_AUTO)
50        avctx->idct_algo=FF_IDCT_EA;
51    dsputil_init(&s->dsp, avctx);
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 = PIX_FMT_YUV420P;
56    ff_mpeg12_init_vlcs();
57    return 0;
58}
59
60static int tqi_decode_mb(MpegEncContext *s, DCTELEM (*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
71static inline void tqi_idct_put(TqiContext *t, DCTELEM (*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    s->dsp.idct_put(dest_y                 , linesize, block[0]);
80    s->dsp.idct_put(dest_y              + 8, linesize, block[1]);
81    s->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
82    s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
83    if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
84        s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]);
85        s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
86    }
87}
88
89static void tqi_calculate_qtable(MpegEncContext *s, int quant)
90{
91    const int qscale = (215 - 2*quant)*5;
92    int i;
93    if (s->avctx->idct_algo==FF_IDCT_EA) {
94        s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
95        for(i=1; i<64; i++)
96            s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
97    }else{
98        s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
99        for(i=1; i<64; i++)
100            s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
101    }
102}
103
104static int tqi_decode_frame(AVCodecContext *avctx,
105                            void *data, int *data_size,
106                            AVPacket *avpkt)
107{
108    const uint8_t *buf = avpkt->data;
109    int buf_size = avpkt->size;
110    const uint8_t *buf_end = buf+buf_size;
111    TqiContext *t = avctx->priv_data;
112    MpegEncContext *s = &t->s;
113
114    s->width  = AV_RL16(&buf[0]);
115    s->height = AV_RL16(&buf[2]);
116    tqi_calculate_qtable(s, buf[4]);
117    buf += 8;
118
119    if (t->frame.data[0])
120        avctx->release_buffer(avctx, &t->frame);
121
122    if (s->avctx->width!=s->width || s->avctx->height!=s->height)
123        avcodec_set_dimensions(s->avctx, s->width, s->height);
124
125    if(avctx->get_buffer(avctx, &t->frame) < 0) {
126        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
127        return -1;
128    }
129
130    av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
131    if (!t->bitstream_buf)
132        return AVERROR(ENOMEM);
133    s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
134    init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
135
136    s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
137    for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
138    for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
139    {
140        if (tqi_decode_mb(s, t->block) < 0)
141            break;
142        tqi_idct_put(t, t->block);
143    }
144
145    *data_size = sizeof(AVFrame);
146    *(AVFrame*)data = t->frame;
147    return buf_size;
148}
149
150static av_cold int tqi_decode_end(AVCodecContext *avctx)
151{
152    TqiContext *t = avctx->priv_data;
153    if(t->frame.data[0])
154        avctx->release_buffer(avctx, &t->frame);
155    av_free(t->bitstream_buf);
156    return 0;
157}
158
159AVCodec ff_eatqi_decoder = {
160    .name           = "eatqi",
161    .type           = AVMEDIA_TYPE_VIDEO,
162    .id             = CODEC_ID_TQI,
163    .priv_data_size = sizeof(TqiContext),
164    .init           = tqi_decode_init,
165    .close          = tqi_decode_end,
166    .decode         = tqi_decode_frame,
167    .capabilities   = CODEC_CAP_DR1,
168    .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
169};
170