| /* |
| * Electronic Arts TGQ Video Decoder |
| * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Electronic Arts TGQ Video Decoder |
| * @author Peter Ross <pross@xvid.org> |
| * |
| * Technical details here: |
| * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ |
| */ |
| |
| #define BITSTREAM_READER_LE |
| #include "aandcttab.h" |
| #include "avcodec.h" |
| #include "bytestream.h" |
| #include "eaidct.h" |
| #include "get_bits.h" |
| #include "idctdsp.h" |
| #include "internal.h" |
| |
| typedef struct TgqContext { |
| AVCodecContext *avctx; |
| int width, height; |
| ScanTable scantable; |
| int qtable[64]; |
| DECLARE_ALIGNED(16, int16_t, block)[6][64]; |
| GetByteContext gb; |
| } TgqContext; |
| |
| static av_cold int tgq_decode_init(AVCodecContext *avctx) |
| { |
| TgqContext *s = avctx->priv_data; |
| uint8_t idct_permutation[64]; |
| s->avctx = avctx; |
| ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE); |
| ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct); |
| avctx->framerate = (AVRational){ 15, 1 }; |
| avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| return 0; |
| } |
| |
| static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb) |
| { |
| uint8_t *perm = s->scantable.permutated; |
| int i, j, value; |
| block[0] = get_sbits(gb, 8) * s->qtable[0]; |
| for (i = 1; i < 64;) { |
| switch (show_bits(gb, 3)) { |
| case 4: |
| block[perm[i++]] = 0; |
| case 0: |
| block[perm[i++]] = 0; |
| skip_bits(gb, 3); |
| break; |
| case 5: |
| case 1: |
| skip_bits(gb, 2); |
| value = get_bits(gb, 6); |
| for (j = 0; j < value; j++) |
| block[perm[i++]] = 0; |
| break; |
| case 6: |
| skip_bits(gb, 3); |
| block[perm[i]] = -s->qtable[perm[i]]; |
| i++; |
| break; |
| case 2: |
| skip_bits(gb, 3); |
| block[perm[i]] = s->qtable[perm[i]]; |
| i++; |
| break; |
| case 7: // 111b |
| case 3: // 011b |
| skip_bits(gb, 2); |
| if (show_bits(gb, 6) == 0x3F) { |
| skip_bits(gb, 6); |
| block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]]; |
| } else { |
| block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]]; |
| } |
| i++; |
| break; |
| } |
| } |
| block[0] += 128 << 4; |
| } |
| |
| static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame, |
| int mb_x, int mb_y) |
| { |
| ptrdiff_t linesize = frame->linesize[0]; |
| uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16; |
| uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; |
| uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; |
| |
| ff_ea_idct_put_c(dest_y , linesize, block[0]); |
| ff_ea_idct_put_c(dest_y + 8, linesize, block[1]); |
| ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]); |
| ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]); |
| if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
| ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]); |
| ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]); |
| } |
| } |
| |
| static inline void tgq_dconly(TgqContext *s, unsigned char *dst, |
| ptrdiff_t dst_stride, int dc) |
| { |
| int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4); |
| int j; |
| for (j = 0; j < 8; j++) |
| memset(dst + j * dst_stride, level, 8); |
| } |
| |
| static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame, |
| int mb_x, int mb_y, const int8_t *dc) |
| { |
| ptrdiff_t linesize = frame->linesize[0]; |
| uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16; |
| uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; |
| uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; |
| tgq_dconly(s, dest_y, linesize, dc[0]); |
| tgq_dconly(s, dest_y + 8, linesize, dc[1]); |
| tgq_dconly(s, dest_y + 8 * linesize, linesize, dc[2]); |
| tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]); |
| if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
| tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]); |
| tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]); |
| } |
| } |
| |
| static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x) |
| { |
| int mode; |
| int i; |
| int8_t dc[6]; |
| |
| mode = bytestream2_get_byte(&s->gb); |
| if (mode > 12) { |
| GetBitContext gb; |
| int ret = init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode)); |
| if (ret < 0) |
| return ret; |
| |
| for (i = 0; i < 6; i++) |
| tgq_decode_block(s, s->block[i], &gb); |
| tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y); |
| bytestream2_skip(&s->gb, mode); |
| } else { |
| if (mode == 3) { |
| memset(dc, bytestream2_get_byte(&s->gb), 4); |
| dc[4] = bytestream2_get_byte(&s->gb); |
| dc[5] = bytestream2_get_byte(&s->gb); |
| } else if (mode == 6) { |
| bytestream2_get_buffer(&s->gb, dc, 6); |
| } else if (mode == 12) { |
| for (i = 0; i < 6; i++) { |
| dc[i] = bytestream2_get_byte(&s->gb); |
| bytestream2_skip(&s->gb, 1); |
| } |
| } else { |
| av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode); |
| return -1; |
| } |
| tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc); |
| } |
| return 0; |
| } |
| |
| static void tgq_calculate_qtable(TgqContext *s, int quant) |
| { |
| int i, j; |
| const int a = (14 * (100 - quant)) / 100 + 1; |
| const int b = (11 * (100 - quant)) / 100 + 4; |
| for (j = 0; j < 8; j++) |
| for (i = 0; i < 8; i++) |
| s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) * |
| ff_inv_aanscales[j * 8 + i]) >> (14 - 4); |
| } |
| |
| static int tgq_decode_frame(AVCodecContext *avctx, |
| void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| TgqContext *s = avctx->priv_data; |
| AVFrame *frame = data; |
| int x, y, ret; |
| int big_endian; |
| |
| if (buf_size < 16) { |
| av_log(avctx, AV_LOG_WARNING, "truncated header\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| big_endian = AV_RL32(&buf[4]) > 0x000FFFFF; |
| bytestream2_init(&s->gb, buf + 8, buf_size - 8); |
| if (big_endian) { |
| s->width = bytestream2_get_be16u(&s->gb); |
| s->height = bytestream2_get_be16u(&s->gb); |
| } else { |
| s->width = bytestream2_get_le16u(&s->gb); |
| s->height = bytestream2_get_le16u(&s->gb); |
| } |
| |
| ret = ff_set_dimensions(s->avctx, s->width, s->height); |
| if (ret < 0) |
| return ret; |
| |
| tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb)); |
| bytestream2_skip(&s->gb, 3); |
| |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| return ret; |
| frame->key_frame = 1; |
| frame->pict_type = AV_PICTURE_TYPE_I; |
| |
| for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++) |
| for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++) |
| if (tgq_decode_mb(s, frame, y, x) < 0) |
| return AVERROR_INVALIDDATA; |
| |
| *got_frame = 1; |
| |
| return avpkt->size; |
| } |
| |
| AVCodec ff_eatgq_decoder = { |
| .name = "eatgq", |
| .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_TGQ, |
| .priv_data_size = sizeof(TgqContext), |
| .init = tgq_decode_init, |
| .decode = tgq_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
