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"
40 typedef struct TgqContext {
41 AVCodecContext *avctx;
46 DECLARE_ALIGNED(16, int16_t, block)[6][64];
50 static av_cold int tgq_decode_init(AVCodecContext *avctx)
52 TgqContext *s = avctx->priv_data;
53 uint8_t idct_permutation[64];
55 ff_init_scantable_permutation(idct_permutation, FF_NO_IDCT_PERM);
56 ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
57 avctx->time_base = (AVRational){1, 15};
58 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
62 static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
64 uint8_t *perm = s->scantable.permutated;
66 block[0] = get_sbits(gb, 8) * s->qtable[0];
67 for (i = 1; i < 64;) {
68 switch (show_bits(gb, 3)) {
78 value = get_bits(gb, 6);
79 for (j = 0; j < value; j++)
84 block[perm[i]] = -s->qtable[perm[i]];
89 block[perm[i]] = s->qtable[perm[i]];
95 if (show_bits(gb, 6) == 0x3F) {
97 block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
99 block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
105 block[0] += 128 << 4;
108 static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64],
111 int linesize = s->frame.linesize[0];
112 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16 * linesize) + mb_x * 16;
113 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
114 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
116 ff_ea_idct_put_c(dest_y , linesize, block[0]);
117 ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
118 ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]);
119 ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
120 if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
121 ff_ea_idct_put_c(dest_cb, s->frame.linesize[1], block[4]);
122 ff_ea_idct_put_c(dest_cr, s->frame.linesize[2], block[5]);
126 static inline void tgq_dconly(TgqContext *s, unsigned char *dst,
127 int dst_stride, int dc)
129 int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
131 for (j = 0; j < 8; j++)
132 memset(dst + j * dst_stride, level, 8);
135 static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc)
137 int linesize = s->frame.linesize[0];
138 uint8_t *dest_y = s->frame.data[0] + (mb_y * 16 * linesize) + mb_x * 16;
139 uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
140 uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
141 tgq_dconly(s, dest_y, linesize, dc[0]);
142 tgq_dconly(s, dest_y + 8, linesize, dc[1]);
143 tgq_dconly(s, dest_y + 8 * linesize, linesize, dc[2]);
144 tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]);
145 if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
146 tgq_dconly(s, dest_cb, s->frame.linesize[1], dc[4]);
147 tgq_dconly(s, dest_cr, s->frame.linesize[2], dc[5]);
151 static int tgq_decode_mb(TgqContext *s, int mb_y, int mb_x)
157 mode = bytestream2_get_byte(&s->gb);
160 init_get_bits(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode) * 8);
161 for (i = 0; i < 6; i++)
162 tgq_decode_block(s, s->block[i], &gb);
163 tgq_idct_put_mb(s, s->block, mb_x, mb_y);
164 bytestream2_skip(&s->gb, mode);
167 memset(dc, bytestream2_get_byte(&s->gb), 4);
168 dc[4] = bytestream2_get_byte(&s->gb);
169 dc[5] = bytestream2_get_byte(&s->gb);
170 } else if (mode == 6) {
171 bytestream2_get_buffer(&s->gb, dc, 6);
172 } else if (mode == 12) {
173 for (i = 0; i < 6; i++) {
174 dc[i] = bytestream2_get_byte(&s->gb);
175 bytestream2_skip(&s->gb, 1);
178 av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
181 tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc);
186 static void tgq_calculate_qtable(TgqContext *s, int quant)
189 const int a = (14 * (100 - quant)) / 100 + 1;
190 const int b = (11 * (100 - quant)) / 100 + 4;
191 for (j = 0; j < 8; j++)
192 for (i = 0; i < 8; i++)
193 s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
194 ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
197 static int tgq_decode_frame(AVCodecContext *avctx,
198 void *data, int *got_frame,
201 const uint8_t *buf = avpkt->data;
202 int buf_size = avpkt->size;
203 TgqContext *s = avctx->priv_data;
208 av_log(avctx, AV_LOG_WARNING, "truncated header\n");
209 return AVERROR_INVALIDDATA;
211 big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
212 bytestream2_init(&s->gb, buf + 8, buf_size - 8);
214 s->width = bytestream2_get_be16u(&s->gb);
215 s->height = bytestream2_get_be16u(&s->gb);
217 s->width = bytestream2_get_le16u(&s->gb);
218 s->height = bytestream2_get_le16u(&s->gb);
221 if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
222 avcodec_set_dimensions(s->avctx, s->width, s->height);
223 if (s->frame.data[0])
224 avctx->release_buffer(avctx, &s->frame);
226 tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
227 bytestream2_skip(&s->gb, 3);
229 if (!s->frame.data[0]) {
230 s->frame.key_frame = 1;
231 s->frame.pict_type = AV_PICTURE_TYPE_I;
232 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
233 if ((ret = ff_get_buffer(avctx, &s->frame)) < 0) {
234 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
239 for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
240 for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
241 if (tgq_decode_mb(s, y, x) < 0)
242 return AVERROR_INVALIDDATA;
245 *(AVFrame*)data = s->frame;
250 static av_cold int tgq_decode_end(AVCodecContext *avctx)
252 TgqContext *s = avctx->priv_data;
253 if (s->frame.data[0])
254 s->avctx->release_buffer(avctx, &s->frame);
258 AVCodec ff_eatgq_decoder = {
260 .type = AVMEDIA_TYPE_VIDEO,
261 .id = AV_CODEC_ID_TGQ,
262 .priv_data_size = sizeof(TgqContext),
263 .init = tgq_decode_init,
264 .close = tgq_decode_end,
265 .decode = tgq_decode_frame,
266 .capabilities = CODEC_CAP_DR1,
267 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),