2 * Electronic Arts TQI Video Decoder
3 * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
5 * This file is part of Libav.
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.
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.
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
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
32 #include "aandcttab.h"
34 #include "mpegvideo.h"
36 typedef struct TqiContext {
40 unsigned int bitstream_buf_size;
41 DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
44 static av_cold int tqi_decode_init(AVCodecContext *avctx)
46 TqiContext *t = avctx->priv_data;
47 MpegEncContext *s = &t->s;
49 if(avctx->idct_algo==FF_IDCT_AUTO)
50 avctx->idct_algo=FF_IDCT_EA;
51 ff_dsputil_init(&s->dsp, avctx);
52 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
54 avctx->time_base = (AVRational){1, 15};
55 avctx->pix_fmt = PIX_FMT_YUV420P;
56 ff_mpeg12_init_vlcs();
60 static void tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
63 s->dsp.clear_blocks(block[0]);
65 ff_mpeg1_decode_block_intra(s, block[n], n);
68 static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
70 MpegEncContext *s = &t->s;
71 int linesize= t->frame.linesize[0];
72 uint8_t *dest_y = t->frame.data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16;
73 uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
74 uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8;
76 s->dsp.idct_put(dest_y , linesize, block[0]);
77 s->dsp.idct_put(dest_y + 8, linesize, block[1]);
78 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
79 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
80 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
81 s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]);
82 s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
86 static void tqi_calculate_qtable(MpegEncContext *s, int quant)
88 const int qscale = (215 - 2*quant)*5;
90 if (s->avctx->idct_algo==FF_IDCT_EA) {
91 s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
93 s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
95 s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
97 s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
101 static int tqi_decode_frame(AVCodecContext *avctx,
102 void *data, int *data_size,
105 const uint8_t *buf = avpkt->data;
106 int buf_size = avpkt->size;
107 const uint8_t *buf_end = buf+buf_size;
108 TqiContext *t = avctx->priv_data;
109 MpegEncContext *s = &t->s;
111 s->width = AV_RL16(&buf[0]);
112 s->height = AV_RL16(&buf[2]);
113 tqi_calculate_qtable(s, buf[4]);
116 if (t->frame.data[0])
117 avctx->release_buffer(avctx, &t->frame);
119 if (s->avctx->width!=s->width || s->avctx->height!=s->height)
120 avcodec_set_dimensions(s->avctx, s->width, s->height);
122 if(avctx->get_buffer(avctx, &t->frame) < 0) {
123 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
127 av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
129 if (!t->bitstream_buf)
130 return AVERROR(ENOMEM);
131 s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
132 init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
134 s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
135 for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
136 for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
138 tqi_decode_mb(s, t->block);
139 tqi_idct_put(t, t->block);
142 *data_size = sizeof(AVFrame);
143 *(AVFrame*)data = t->frame;
147 static av_cold int tqi_decode_end(AVCodecContext *avctx)
149 TqiContext *t = avctx->priv_data;
151 avctx->release_buffer(avctx, &t->frame);
152 av_free(t->bitstream_buf);
156 AVCodec ff_eatqi_decoder = {
158 .type = AVMEDIA_TYPE_VIDEO,
160 .priv_data_size = sizeof(TqiContext),
161 .init = tqi_decode_init,
162 .close = tqi_decode_end,
163 .decode = tqi_decode_frame,
164 .capabilities = CODEC_CAP_DR1,
165 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),