2 * Electronic Arts TGQ Video Decoder
3 * Copyright (c) 2007-2008 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 TGQ Video Decoder
25 * @author Peter Ross <pross@xvid.org>
27 * Technical details here:
28 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ
32 #define BITSTREAM_READER_LE
34 #include "bytestream.h"
36 #include "aandcttab.h"
38 typedef struct TgqContext {
39 AVCodecContext *avctx;
45 DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
49 static av_cold int tgq_decode_init(AVCodecContext *avctx){
50 TgqContext *s = avctx->priv_data;
52 if(avctx->idct_algo==FF_IDCT_AUTO)
53 avctx->idct_algo=FF_IDCT_EA;
54 ff_dsputil_init(&s->dsp, avctx);
55 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
56 avctx->time_base = (AVRational){1, 15};
57 avctx->pix_fmt = PIX_FMT_YUV420P;
61 static void tgq_decode_block(TgqContext *s, DCTELEM block[64], GetBitContext *gb){
62 uint8_t *perm = s->scantable.permutated;
64 block[0] = get_sbits(gb,8) * s->qtable[0];
66 switch(show_bits(gb,3)) {
76 value = get_bits(gb,6);
77 for(j=0; j<value; j++)
82 block[perm[i]] = -s->qtable[perm[i]];
87 block[perm[i]] = s->qtable[perm[i]];
93 if (show_bits(gb,6)==0x3F) {
95 block[perm[i]] = get_sbits(gb,8)*s->qtable[perm[i]];
97 block[perm[i]] = get_sbits(gb,6)*s->qtable[perm[i]];
106 static void tgq_idct_put_mb(TgqContext *s, DCTELEM (*block)[64], int mb_x, int mb_y){
107 int linesize= s->frame.linesize[0];
108 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
109 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
110 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
112 s->dsp.idct_put(dest_y , linesize, block[0]);
113 s->dsp.idct_put(dest_y + 8, linesize, block[1]);
114 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
115 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
116 if(!(s->avctx->flags&CODEC_FLAG_GRAY)){
117 s->dsp.idct_put(dest_cb, s->frame.linesize[1], block[4]);
118 s->dsp.idct_put(dest_cr, s->frame.linesize[2], block[5]);
122 static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc){
123 int level = av_clip_uint8((dc*s->qtable[0] + 2056)>>4);
126 memset(dst+j*dst_stride, level, 8);
129 static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc)
131 int linesize= s->frame.linesize[0];
132 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
133 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
134 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
135 tgq_dconly(s,dest_y , linesize, dc[0]);
136 tgq_dconly(s,dest_y + 8, linesize, dc[1]);
137 tgq_dconly(s,dest_y + 8*linesize , linesize, dc[2]);
138 tgq_dconly(s,dest_y + 8*linesize + 8, linesize, dc[3]);
139 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
140 tgq_dconly(s,dest_cb, s->frame.linesize[1], dc[4]);
141 tgq_dconly(s,dest_cr, s->frame.linesize[2], dc[5]);
145 static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x){
150 mode = bytestream2_get_byte(&s->gb);
153 init_get_bits(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode) * 8);
155 tgq_decode_block(s, s->block[i], &gb);
156 tgq_idct_put_mb(s, s->block, mb_x, mb_y);
157 bytestream2_skip(&s->gb, mode);
160 memset(dc, bytestream2_get_byte(&s->gb), 4);
161 dc[4] = bytestream2_get_byte(&s->gb);
162 dc[5] = bytestream2_get_byte(&s->gb);
164 bytestream2_get_buffer(&s->gb, dc, 6);
165 }else if (mode==12) {
166 for (i = 0; i < 6; i++) {
167 dc[i] = bytestream2_get_byte(&s->gb);
168 bytestream2_skip(&s->gb, 1);
171 av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
173 tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc);
177 static void tgq_calculate_qtable(TgqContext *s, int quant){
179 const int a = (14*(100-quant))/100 + 1;
180 const int b = (11*(100-quant))/100 + 4;
183 if (s->avctx->idct_algo==FF_IDCT_EA)
184 s->qtable[j*8+i] = ((a*(j+i)/(7+7) + b)*ff_inv_aanscales[j*8+i])>>(14-4);
186 s->qtable[j*8+i] = (a*(j+i)/(7+7) + b)<<3;
189 static int tgq_decode_frame(AVCodecContext *avctx,
190 void *data, int *data_size,
192 const uint8_t *buf = avpkt->data;
193 int buf_size = avpkt->size;
194 TgqContext *s = avctx->priv_data;
196 int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
199 av_log(avctx, AV_LOG_WARNING, "truncated header\n");
202 bytestream2_init(&s->gb, buf + 8, buf_size - 8);
204 s->width = bytestream2_get_be16u(&s->gb);
205 s->height = bytestream2_get_be16u(&s->gb);
207 s->width = bytestream2_get_le16u(&s->gb);
208 s->height = bytestream2_get_le16u(&s->gb);
211 if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
212 avcodec_set_dimensions(s->avctx, s->width, s->height);
213 if (s->frame.data[0])
214 avctx->release_buffer(avctx, &s->frame);
216 tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
217 bytestream2_skip(&s->gb, 3);
219 if (!s->frame.data[0]) {
220 s->frame.key_frame = 1;
221 s->frame.pict_type = AV_PICTURE_TYPE_I;
222 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
223 if (avctx->get_buffer(avctx, &s->frame)) {
224 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
229 for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
230 for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
231 tgq_decode_mb(s, y, x);
233 *data_size = sizeof(AVFrame);
234 *(AVFrame*)data = s->frame;
239 static av_cold int tgq_decode_end(AVCodecContext *avctx){
240 TgqContext *s = avctx->priv_data;
241 if (s->frame.data[0])
242 s->avctx->release_buffer(avctx, &s->frame);
246 AVCodec ff_eatgq_decoder = {
248 .type = AVMEDIA_TYPE_VIDEO,
250 .priv_data_size = sizeof(TgqContext),
251 .init = tgq_decode_init,
252 .close = tgq_decode_end,
253 .decode = tgq_decode_frame,
254 .capabilities = CODEC_CAP_DR1,
255 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),