7a985050c5a7a39087df76eaa060d7475f03c03f
[libav.git] / libavcodec / eatgq.c
1 /*
2 * Electronic Arts TGQ Video Decoder
3 * Copyright (c) 2007-2008 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 TGQ Video Decoder
25 * @author Peter Ross <pross@xvid.org>
26 *
27 * Technical details here:
28 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ
29 */
30
31 #include "avcodec.h"
32 #define ALT_BITSTREAM_READER_LE
33 #include "get_bits.h"
34 #include "bytestream.h"
35 #include "dsputil.h"
36 #include "aandcttab.h"
37
38 typedef struct TgqContext {
39 AVCodecContext *avctx;
40 DSPContext dsp;
41 AVFrame frame;
42 int width,height;
43 ScanTable scantable;
44 int qtable[64];
45 DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
46 } TgqContext;
47
48 static av_cold int tgq_decode_init(AVCodecContext *avctx){
49 TgqContext *s = avctx->priv_data;
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->scantable, ff_zigzag_direct);
55 avctx->time_base = (AVRational){1, 15};
56 avctx->pix_fmt = PIX_FMT_YUV420P;
57 return 0;
58 }
59
60 static void tgq_decode_block(TgqContext *s, DCTELEM block[64], GetBitContext *gb){
61 uint8_t *perm = s->scantable.permutated;
62 int i,j,value;
63 block[0] = get_sbits(gb,8) * s->qtable[0];
64 for(i=1; i<64; ) {
65 switch(show_bits(gb,3)) {
66 case 4:
67 block[perm[i++]] = 0;
68 case 0:
69 block[perm[i++]] = 0;
70 skip_bits(gb,3);
71 break;
72 case 5:
73 case 1:
74 skip_bits(gb,2);
75 value = get_bits(gb,6);
76 for(j=0; j<value; j++)
77 block[perm[i++]] = 0;
78 break;
79 case 6:
80 skip_bits(gb,3);
81 block[perm[i]] = -s->qtable[perm[i]];
82 i++;
83 break;
84 case 2:
85 skip_bits(gb,3);
86 block[perm[i]] = s->qtable[perm[i]];
87 i++;
88 break;
89 case 7: // 111b
90 case 3: // 011b
91 skip_bits(gb,2);
92 if (show_bits(gb,6)==0x3F) {
93 skip_bits(gb, 6);
94 block[perm[i]] = get_sbits(gb,8)*s->qtable[perm[i]];
95 }else{
96 block[perm[i]] = get_sbits(gb,6)*s->qtable[perm[i]];
97 }
98 i++;
99 break;
100 }
101 }
102 block[0] += 128<<4;
103 }
104
105 static void tgq_idct_put_mb(TgqContext *s, DCTELEM (*block)[64], int mb_x, int mb_y){
106 int linesize= s->frame.linesize[0];
107 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
108 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
109 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
110
111 s->dsp.idct_put(dest_y , linesize, block[0]);
112 s->dsp.idct_put(dest_y + 8, linesize, block[1]);
113 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
114 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
115 if(!(s->avctx->flags&CODEC_FLAG_GRAY)){
116 s->dsp.idct_put(dest_cb, s->frame.linesize[1], block[4]);
117 s->dsp.idct_put(dest_cr, s->frame.linesize[2], block[5]);
118 }
119 }
120
121 static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc){
122 int level = av_clip_uint8((dc*s->qtable[0] + 2056)>>4);
123 int j;
124 for(j=0;j<8;j++)
125 memset(dst+j*dst_stride, level, 8);
126 }
127
128 static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc)
129 {
130 int linesize= s->frame.linesize[0];
131 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
132 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
133 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
134 tgq_dconly(s,dest_y , linesize, dc[0]);
135 tgq_dconly(s,dest_y + 8, linesize, dc[1]);
136 tgq_dconly(s,dest_y + 8*linesize , linesize, dc[2]);
137 tgq_dconly(s,dest_y + 8*linesize + 8, linesize, dc[3]);
138 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
139 tgq_dconly(s,dest_cb, s->frame.linesize[1], dc[4]);
140 tgq_dconly(s,dest_cr, s->frame.linesize[2], dc[5]);
141 }
142 }
143
144 static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x, const uint8_t **bs, const uint8_t *buf_end){
145 int mode;
146 int i;
147 int8_t dc[6];
148
149 mode = bytestream_get_byte(bs);
150 if (mode>buf_end-*bs) {
151 av_log(s->avctx, AV_LOG_ERROR, "truncated macroblock\n");
152 return;
153 }
154
155 if (mode>12) {
156 GetBitContext gb;
157 init_get_bits(&gb, *bs, mode*8);
158 for(i=0; i<6; i++)
159 tgq_decode_block(s, s->block[i], &gb);
160 tgq_idct_put_mb(s, s->block, mb_x, mb_y);
161 }else{
162 if (mode==3) {
163 memset(dc, (*bs)[0], 4);
164 dc[4] = (*bs)[1];
165 dc[5] = (*bs)[2];
166 }else if (mode==6) {
167 memcpy(dc, *bs, 6);
168 }else if (mode==12) {
169 for(i=0; i<6; i++)
170 dc[i] = (*bs)[i*2];
171 }else{
172 av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
173 }
174 tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc);
175 }
176 *bs += mode;
177 }
178
179 static void tgq_calculate_qtable(TgqContext *s, int quant){
180 int i,j;
181 const int a = (14*(100-quant))/100 + 1;
182 const int b = (11*(100-quant))/100 + 4;
183 for(j=0;j<8;j++)
184 for(i=0;i<8;i++)
185 if (s->avctx->idct_algo==FF_IDCT_EA)
186 s->qtable[j*8+i] = ((a*(j+i)/(7+7) + b)*ff_inv_aanscales[j*8+i])>>(14-4);
187 else
188 s->qtable[j*8+i] = (a*(j+i)/(7+7) + b)<<3;
189 }
190
191 static int tgq_decode_frame(AVCodecContext *avctx,
192 void *data, int *data_size,
193 AVPacket *avpkt){
194 const uint8_t *buf = avpkt->data;
195 int buf_size = avpkt->size;
196 const uint8_t *buf_start = buf;
197 const uint8_t *buf_end = buf + buf_size;
198 TgqContext *s = avctx->priv_data;
199 int x,y;
200
201 int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
202 buf += 8;
203
204 if(8>buf_end-buf) {
205 av_log(avctx, AV_LOG_WARNING, "truncated header\n");
206 return -1;
207 }
208 s->width = big_endian ? AV_RB16(&buf[0]) : AV_RL16(&buf[0]);
209 s->height = big_endian ? AV_RB16(&buf[2]) : AV_RL16(&buf[2]);
210
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);
215 }
216 tgq_calculate_qtable(s, buf[4]);
217 buf += 8;
218
219 if (!s->frame.data[0]) {
220 s->frame.key_frame = 1;
221 s->frame.pict_type = FF_I_TYPE;
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");
225 return -1;
226 }
227 }
228
229 for (y=0; y<(avctx->height+15)/16; y++)
230 for (x=0; x<(avctx->width+15)/16; x++)
231 tgq_decode_mb(s, y, x, &buf, buf_end);
232
233 *data_size = sizeof(AVFrame);
234 *(AVFrame*)data = s->frame;
235
236 return buf-buf_start;
237 }
238
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);
243 return 0;
244 }
245
246 AVCodec eatgq_decoder = {
247 "eatgq",
248 AVMEDIA_TYPE_VIDEO,
249 CODEC_ID_TGQ,
250 sizeof(TgqContext),
251 tgq_decode_init,
252 NULL,
253 tgq_decode_end,
254 tgq_decode_frame,
255 CODEC_CAP_DR1,
256 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
257 };