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 * @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
40typedef 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
48static 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_NO_IDCT_PERM);
57    ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
58    s->qscale = 1;
59    avctx->time_base = (AVRational){1, 15};
60    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
61    ff_mpeg12_init_vlcs();
62    return 0;
63}
64
65static 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        if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
71            return -1;
72
73    return 0;
74}
75
76static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64])
77{
78    MpegEncContext *s = &t->s;
79    int linesize = frame->linesize[0];
80    uint8_t *dest_y  = frame->data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
81    uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8;
82    uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8;
83
84    ff_ea_idct_put_c(dest_y                 , linesize, block[0]);
85    ff_ea_idct_put_c(dest_y              + 8, linesize, block[1]);
86    ff_ea_idct_put_c(dest_y + 8*linesize    , linesize, block[2]);
87    ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
88    if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
89        ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
90        ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
91    }
92}
93
94static void tqi_calculate_qtable(MpegEncContext *s, int quant)
95{
96    const int qscale = (215 - 2*quant)*5;
97    int i;
98    s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
99    for(i=1; i<64; i++)
100        s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
101}
102
103static int tqi_decode_frame(AVCodecContext *avctx,
104                            void *data, int *got_frame,
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    AVFrame *frame = data;
113    int ret;
114
115    s->width  = AV_RL16(&buf[0]);
116    s->height = AV_RL16(&buf[2]);
117    tqi_calculate_qtable(s, buf[4]);
118    buf += 8;
119
120    ret = ff_set_dimensions(s->avctx, s->width, s->height);
121    if (ret < 0)
122        return ret;
123
124    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
125        return ret;
126
127    av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
128                          buf_end - buf);
129    if (!t->bitstream_buf)
130        return AVERROR(ENOMEM);
131    t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
132                       (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        if (tqi_decode_mb(s, t->block) < 0)
140            goto end;
141        tqi_idct_put(t, frame, t->block);
142    }
143    end:
144
145    *got_frame = 1;
146    return buf_size;
147}
148
149static av_cold int tqi_decode_end(AVCodecContext *avctx)
150{
151    TqiContext *t = avctx->priv_data;
152    av_free(t->bitstream_buf);
153    return 0;
154}
155
156AVCodec ff_eatqi_decoder = {
157    .name           = "eatqi",
158    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
159    .type           = AVMEDIA_TYPE_VIDEO,
160    .id             = AV_CODEC_ID_TQI,
161    .priv_data_size = sizeof(TqiContext),
162    .init           = tqi_decode_init,
163    .close          = tqi_decode_end,
164    .decode         = tqi_decode_frame,
165    .capabilities   = CODEC_CAP_DR1,
166};
167