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 * 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 "get_bits.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    void *bitstream_buf;
42    unsigned int bitstream_buf_size;
43    DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
44} TqiContext;
45
46static av_cold int tqi_decode_init(AVCodecContext *avctx)
47{
48    TqiContext *t = avctx->priv_data;
49    MpegEncContext *s = &t->s;
50    s->avctx = avctx;
51    if(avctx->idct_algo==FF_IDCT_AUTO)
52        avctx->idct_algo=FF_IDCT_EA;
53    dsputil_init(&s->dsp, avctx);
54    ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
55    s->qscale = 1;
56    avctx->time_base = (AVRational){1, 15};
57    avctx->pix_fmt = PIX_FMT_YUV420P;
58    ff_mpeg12_init_vlcs();
59    return 0;
60}
61
62static void tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
63{
64    int n;
65    s->dsp.clear_blocks(block[0]);
66    for (n=0; n<6; n++)
67        ff_mpeg1_decode_block_intra(s, block[n], n);
68}
69
70static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
71{
72    MpegEncContext *s = &t->s;
73    int linesize= t->frame.linesize[0];
74    uint8_t *dest_y  = t->frame.data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
75    uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
76    uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8;
77
78    s->dsp.idct_put(dest_y                 , linesize, block[0]);
79    s->dsp.idct_put(dest_y              + 8, linesize, block[1]);
80    s->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
81    s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
82    if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
83        s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]);
84        s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
85    }
86}
87
88static void tqi_calculate_qtable(MpegEncContext *s, int quant)
89{
90    const int qscale = (215 - 2*quant)*5;
91    int i;
92    if (s->avctx->idct_algo==FF_IDCT_EA) {
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    }else{
97        s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
98        for(i=1; i<64; i++)
99            s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
100    }
101}
102
103static int tqi_decode_frame(AVCodecContext *avctx,
104                            void *data, int *data_size,
105                            AVPacket *avpkt)
106{
107    const uint8_t *buf = avpkt->data;
108    int buf_size = avpkt->size;
109    const uint8_t *buf_end = buf+buf_size;
110    TqiContext *t = avctx->priv_data;
111    MpegEncContext *s = &t->s;
112
113    s->width  = AV_RL16(&buf[0]);
114    s->height = AV_RL16(&buf[2]);
115    tqi_calculate_qtable(s, buf[4]);
116    buf += 8;
117
118    if (t->frame.data[0])
119        avctx->release_buffer(avctx, &t->frame);
120
121    if (s->avctx->width!=s->width || s->avctx->height!=s->height)
122        avcodec_set_dimensions(s->avctx, s->width, s->height);
123
124    if(avctx->get_buffer(avctx, &t->frame) < 0) {
125        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
126        return -1;
127    }
128
129    av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
130    if (!t->bitstream_buf)
131        return AVERROR(ENOMEM);
132    s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
133    init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
134
135    s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
136    for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
137    for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
138    {
139        tqi_decode_mb(s, t->block);
140        tqi_idct_put(t, t->block);
141    }
142
143    *data_size = sizeof(AVFrame);
144    *(AVFrame*)data = t->frame;
145    return buf_size;
146}
147
148static av_cold int tqi_decode_end(AVCodecContext *avctx)
149{
150    TqiContext *t = avctx->priv_data;
151    if(t->frame.data[0])
152        avctx->release_buffer(avctx, &t->frame);
153    av_free(t->bitstream_buf);
154    return 0;
155}
156
157AVCodec eatqi_decoder = {
158    "eatqi",
159    AVMEDIA_TYPE_VIDEO,
160    CODEC_ID_TQI,
161    sizeof(TqiContext),
162    tqi_decode_init,
163    NULL,
164    tqi_decode_end,
165    tqi_decode_frame,
166    CODEC_CAP_DR1,
167    .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
168};
169