2 * Electronic Arts TQI Video Decoder
3 * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
5 * This file is part of FFmpeg.
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.
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.
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
24 * Electronic Arts TQI Video Decoder
25 * by Peter Ross <pross@xvid.org>
27 * Technical details here:
28 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
34 #include "aandcttab.h"
36 #include "mpegvideo.h"
38 typedef struct TqiContext {
42 unsigned int bitstream_buf_size;
43 DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
46 static av_cold int tqi_decode_init(AVCodecContext *avctx)
48 TqiContext *t = avctx->priv_data;
49 MpegEncContext *s = &t->s;
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);
56 avctx->time_base = (AVRational){1, 15};
57 avctx->pix_fmt = PIX_FMT_YUV420P;
58 ff_mpeg12_init_vlcs();
62 static void tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
65 s->dsp.clear_blocks(block[0]);
67 ff_mpeg1_decode_block_intra(s, block[n], n);
70 static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
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;
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]);
88 static void tqi_calculate_qtable(MpegEncContext *s, int quant)
90 const int qscale = (215 - 2*quant)*5;
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;
95 s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
97 s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
99 s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
103 static int tqi_decode_frame(AVCodecContext *avctx,
104 void *data, int *data_size,
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;
113 s->width = AV_RL16(&buf[0]);
114 s->height = AV_RL16(&buf[2]);
115 tqi_calculate_qtable(s, buf[4]);
118 if (t->frame.data[0])
119 avctx->release_buffer(avctx, &t->frame);
121 if (s->avctx->width!=s->width || s->avctx->height!=s->height)
122 avcodec_set_dimensions(s->avctx, s->width, s->height);
124 if(avctx->get_buffer(avctx, &t->frame) < 0) {
125 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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));
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++)
139 tqi_decode_mb(s, t->block);
140 tqi_idct_put(t, t->block);
143 *data_size = sizeof(AVFrame);
144 *(AVFrame*)data = t->frame;
148 static av_cold int tqi_decode_end(AVCodecContext *avctx)
150 TqiContext *t = avctx->priv_data;
152 avctx->release_buffer(avctx, &t->frame);
153 av_free(t->bitstream_buf);
157 AVCodec eatqi_decoder = {
167 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),