| /* | |
| * 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 "libavutil/mem_internal.h" | |
| #include "aandcttab.h" | |
| #include "avcodec.h" | |
| #include "bytestream.h" | |
| #include "codec_internal.h" | |
| #include "decode.h" | |
| #include "eaidct.h" | |
| #include "get_bits.h" | |
| typedef struct TgqContext { | |
| AVCodecContext *avctx; | |
| int width, height; | |
| int qtable[64]; | |
| DECLARE_ALIGNED(16, int16_t, block)[6][64]; | |
| } TgqContext; | |
| static av_cold int tgq_decode_init(AVCodecContext *avctx) | |
| { | |
| TgqContext *s = avctx->priv_data; | |
| s->avctx = avctx; | |
| avctx->framerate = (AVRational){ 15, 1 }; | |
| avctx->pix_fmt = AV_PIX_FMT_YUV420P; | |
| return 0; | |
| } | |
| static int tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb) | |
| { | |
| const uint8_t *scantable = ff_zigzag_direct; | |
| 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: | |
| if (i >= 63) | |
| return AVERROR_INVALIDDATA; | |
| block[scantable[i++]] = 0; | |
| case 0: | |
| block[scantable[i++]] = 0; | |
| skip_bits(gb, 3); | |
| break; | |
| case 5: | |
| case 1: | |
| skip_bits(gb, 2); | |
| value = get_bits(gb, 6); | |
| if (value > 64 - i) | |
| return AVERROR_INVALIDDATA; | |
| for (j = 0; j < value; j++) | |
| block[scantable[i++]] = 0; | |
| break; | |
| case 6: | |
| skip_bits(gb, 3); | |
| block[scantable[i]] = -s->qtable[scantable[i]]; | |
| i++; | |
| break; | |
| case 2: | |
| skip_bits(gb, 3); | |
| block[scantable[i]] = s->qtable[scantable[i]]; | |
| i++; | |
| break; | |
| case 7: // 111b | |
| case 3: // 011b | |
| skip_bits(gb, 2); | |
| if (show_bits(gb, 6) == 0x3F) { | |
| skip_bits(gb, 6); | |
| block[scantable[i]] = get_sbits(gb, 8) * s->qtable[scantable[i]]; | |
| } else { | |
| block[scantable[i]] = get_sbits(gb, 6) * s->qtable[scantable[i]]; | |
| } | |
| i++; | |
| break; | |
| } | |
| } | |
| block[0] += 128 << 4; | |
| return 0; | |
| } | |
| 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, GetByteContext *gbyte, | |
| AVFrame *frame, int mb_y, int mb_x) | |
| { | |
| int mode; | |
| int i; | |
| int8_t dc[6]; | |
| mode = bytestream2_get_byte(gbyte); | |
| if (mode > 12) { | |
| GetBitContext gb; | |
| int ret = init_get_bits8(&gb, gbyte->buffer, FFMIN(bytestream2_get_bytes_left(gbyte), mode)); | |
| if (ret < 0) | |
| return ret; | |
| for (i = 0; i < 6; i++) { | |
| int ret = tgq_decode_block(s, s->block[i], &gb); | |
| if (ret < 0) | |
| return ret; | |
| } | |
| tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y); | |
| bytestream2_skip(gbyte, mode); | |
| } else { | |
| if (mode == 3) { | |
| memset(dc, bytestream2_get_byte(gbyte), 4); | |
| dc[4] = bytestream2_get_byte(gbyte); | |
| dc[5] = bytestream2_get_byte(gbyte); | |
| } else if (mode == 6) { | |
| if (bytestream2_get_buffer(gbyte, dc, 6) != 6) | |
| return AVERROR_INVALIDDATA; | |
| } else if (mode == 12) { | |
| for (i = 0; i < 6; i++) { | |
| dc[i] = bytestream2_get_byte(gbyte); | |
| bytestream2_skip(gbyte, 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, AVFrame *frame, | |
| int *got_frame, AVPacket *avpkt) | |
| { | |
| const uint8_t *buf = avpkt->data; | |
| int buf_size = avpkt->size; | |
| TgqContext *s = avctx->priv_data; | |
| GetByteContext gbyte; | |
| 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(&gbyte, buf + 8, buf_size - 8); | |
| if (big_endian) { | |
| s->width = bytestream2_get_be16u(&gbyte); | |
| s->height = bytestream2_get_be16u(&gbyte); | |
| } else { | |
| s->width = bytestream2_get_le16u(&gbyte); | |
| s->height = bytestream2_get_le16u(&gbyte); | |
| } | |
| ret = ff_set_dimensions(s->avctx, s->width, s->height); | |
| if (ret < 0) | |
| return ret; | |
| tgq_calculate_qtable(s, bytestream2_get_byteu(&gbyte)); | |
| bytestream2_skipu(&gbyte, 3); | |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
| return ret; | |
| frame->flags |= AV_FRAME_FLAG_KEY; | |
| 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, &gbyte, frame, y, x) < 0) | |
| return AVERROR_INVALIDDATA; | |
| *got_frame = 1; | |
| return avpkt->size; | |
| } | |
| const FFCodec ff_eatgq_decoder = { | |
| .p.name = "eatgq", | |
| CODEC_LONG_NAME("Electronic Arts TGQ video"), | |
| .p.type = AVMEDIA_TYPE_VIDEO, | |
| .p.id = AV_CODEC_ID_TGQ, | |
| .priv_data_size = sizeof(TgqContext), | |
| .init = tgq_decode_init, | |
| FF_CODEC_DECODE_CB(tgq_decode_frame), | |
| .p.capabilities = AV_CODEC_CAP_DR1, | |
| }; |