| 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 BITSTREAM_READER_LE |
| 33 | #include "get_bits.h" |
| 34 | #include "bytestream.h" |
| 35 | #include "idctdsp.h" |
| 36 | #include "aandcttab.h" |
| 37 | #include "eaidct.h" |
| 38 | #include "internal.h" |
| 39 | |
| 40 | typedef struct TgqContext { |
| 41 | AVCodecContext *avctx; |
| 42 | int width, height; |
| 43 | ScanTable scantable; |
| 44 | int qtable[64]; |
| 45 | DECLARE_ALIGNED(16, int16_t, block)[6][64]; |
| 46 | GetByteContext gb; |
| 47 | } TgqContext; |
| 48 | |
| 49 | static av_cold int tgq_decode_init(AVCodecContext *avctx) |
| 50 | { |
| 51 | TgqContext *s = avctx->priv_data; |
| 52 | uint8_t idct_permutation[64]; |
| 53 | s->avctx = avctx; |
| 54 | ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE); |
| 55 | ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct); |
| 56 | avctx->time_base = (AVRational){1, 15}; |
| 57 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb) |
| 62 | { |
| 63 | uint8_t *perm = s->scantable.permutated; |
| 64 | int i, j, value; |
| 65 | block[0] = get_sbits(gb, 8) * s->qtable[0]; |
| 66 | for (i = 1; i < 64;) { |
| 67 | switch (show_bits(gb, 3)) { |
| 68 | case 4: |
| 69 | block[perm[i++]] = 0; |
| 70 | case 0: |
| 71 | block[perm[i++]] = 0; |
| 72 | skip_bits(gb, 3); |
| 73 | break; |
| 74 | case 5: |
| 75 | case 1: |
| 76 | skip_bits(gb, 2); |
| 77 | value = get_bits(gb, 6); |
| 78 | for (j = 0; j < value; j++) |
| 79 | block[perm[i++]] = 0; |
| 80 | break; |
| 81 | case 6: |
| 82 | skip_bits(gb, 3); |
| 83 | block[perm[i]] = -s->qtable[perm[i]]; |
| 84 | i++; |
| 85 | break; |
| 86 | case 2: |
| 87 | skip_bits(gb, 3); |
| 88 | block[perm[i]] = s->qtable[perm[i]]; |
| 89 | i++; |
| 90 | break; |
| 91 | case 7: // 111b |
| 92 | case 3: // 011b |
| 93 | skip_bits(gb, 2); |
| 94 | if (show_bits(gb, 6) == 0x3F) { |
| 95 | skip_bits(gb, 6); |
| 96 | block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]]; |
| 97 | } else { |
| 98 | block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]]; |
| 99 | } |
| 100 | i++; |
| 101 | break; |
| 102 | } |
| 103 | } |
| 104 | block[0] += 128 << 4; |
| 105 | } |
| 106 | |
| 107 | static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame, |
| 108 | int mb_x, int mb_y) |
| 109 | { |
| 110 | int linesize = frame->linesize[0]; |
| 111 | uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16; |
| 112 | uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; |
| 113 | uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; |
| 114 | |
| 115 | ff_ea_idct_put_c(dest_y , linesize, block[0]); |
| 116 | ff_ea_idct_put_c(dest_y + 8, linesize, block[1]); |
| 117 | ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]); |
| 118 | ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]); |
| 119 | if (!(s->avctx->flags & CODEC_FLAG_GRAY)) { |
| 120 | ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]); |
| 121 | ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | static inline void tgq_dconly(TgqContext *s, unsigned char *dst, |
| 126 | int dst_stride, int dc) |
| 127 | { |
| 128 | int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4); |
| 129 | int j; |
| 130 | for (j = 0; j < 8; j++) |
| 131 | memset(dst + j * dst_stride, level, 8); |
| 132 | } |
| 133 | |
| 134 | static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame, |
| 135 | int mb_x, int mb_y, const int8_t *dc) |
| 136 | { |
| 137 | int linesize = frame->linesize[0]; |
| 138 | uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16; |
| 139 | uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; |
| 140 | uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * 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, frame->linesize[1], dc[4]); |
| 147 | tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]); |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x) |
| 152 | { |
| 153 | int mode; |
| 154 | int i; |
| 155 | int8_t dc[6]; |
| 156 | |
| 157 | mode = bytestream2_get_byte(&s->gb); |
| 158 | if (mode > 12) { |
| 159 | GetBitContext gb; |
| 160 | init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode)); |
| 161 | for (i = 0; i < 6; i++) |
| 162 | tgq_decode_block(s, s->block[i], &gb); |
| 163 | tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y); |
| 164 | bytestream2_skip(&s->gb, mode); |
| 165 | } else { |
| 166 | if (mode == 3) { |
| 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); |
| 176 | } |
| 177 | } else { |
| 178 | av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode); |
| 179 | return -1; |
| 180 | } |
| 181 | tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc); |
| 182 | } |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | static void tgq_calculate_qtable(TgqContext *s, int quant) |
| 187 | { |
| 188 | int i, j; |
| 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); |
| 195 | } |
| 196 | |
| 197 | static int tgq_decode_frame(AVCodecContext *avctx, |
| 198 | void *data, int *got_frame, |
| 199 | AVPacket *avpkt) |
| 200 | { |
| 201 | const uint8_t *buf = avpkt->data; |
| 202 | int buf_size = avpkt->size; |
| 203 | TgqContext *s = avctx->priv_data; |
| 204 | AVFrame *frame = data; |
| 205 | int x, y, ret; |
| 206 | int big_endian; |
| 207 | |
| 208 | if (buf_size < 16) { |
| 209 | av_log(avctx, AV_LOG_WARNING, "truncated header\n"); |
| 210 | return AVERROR_INVALIDDATA; |
| 211 | } |
| 212 | big_endian = AV_RL32(&buf[4]) > 0x000FFFFF; |
| 213 | bytestream2_init(&s->gb, buf + 8, buf_size - 8); |
| 214 | if (big_endian) { |
| 215 | s->width = bytestream2_get_be16u(&s->gb); |
| 216 | s->height = bytestream2_get_be16u(&s->gb); |
| 217 | } else { |
| 218 | s->width = bytestream2_get_le16u(&s->gb); |
| 219 | s->height = bytestream2_get_le16u(&s->gb); |
| 220 | } |
| 221 | |
| 222 | ret = ff_set_dimensions(s->avctx, s->width, s->height); |
| 223 | if (ret < 0) |
| 224 | return ret; |
| 225 | |
| 226 | tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb)); |
| 227 | bytestream2_skip(&s->gb, 3); |
| 228 | |
| 229 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 230 | return ret; |
| 231 | frame->key_frame = 1; |
| 232 | frame->pict_type = AV_PICTURE_TYPE_I; |
| 233 | |
| 234 | for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++) |
| 235 | for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++) |
| 236 | if (tgq_decode_mb(s, frame, y, x) < 0) |
| 237 | return AVERROR_INVALIDDATA; |
| 238 | |
| 239 | *got_frame = 1; |
| 240 | |
| 241 | return avpkt->size; |
| 242 | } |
| 243 | |
| 244 | AVCodec ff_eatgq_decoder = { |
| 245 | .name = "eatgq", |
| 246 | .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"), |
| 247 | .type = AVMEDIA_TYPE_VIDEO, |
| 248 | .id = AV_CODEC_ID_TGQ, |
| 249 | .priv_data_size = sizeof(TgqContext), |
| 250 | .init = tgq_decode_init, |
| 251 | .decode = tgq_decode_frame, |
| 252 | .capabilities = CODEC_CAP_DR1, |
| 253 | }; |