252 lines
8.2 KiB
C
252 lines
8.2 KiB
C
/*
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* Electronic Arts TGQ Video Decoder
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* Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Electronic Arts TGQ Video Decoder
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* @author Peter Ross <pross@xvid.org>
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*
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* Technical details here:
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* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ
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*/
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#include "avcodec.h"
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#define BITSTREAM_READER_LE
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#include "get_bits.h"
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#include "bytestream.h"
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#include "idctdsp.h"
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#include "aandcttab.h"
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#include "eaidct.h"
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#include "internal.h"
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typedef struct TgqContext {
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AVCodecContext *avctx;
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int width, height;
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ScanTable scantable;
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int qtable[64];
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DECLARE_ALIGNED(16, int16_t, block)[6][64];
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GetByteContext gb;
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} TgqContext;
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static av_cold int tgq_decode_init(AVCodecContext *avctx)
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{
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TgqContext *s = avctx->priv_data;
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uint8_t idct_permutation[64];
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s->avctx = avctx;
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ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE);
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ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
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avctx->time_base = (AVRational){1, 15};
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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return 0;
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}
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static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
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{
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uint8_t *perm = s->scantable.permutated;
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int i, j, value;
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block[0] = get_sbits(gb, 8) * s->qtable[0];
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for (i = 1; i < 64;) {
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switch (show_bits(gb, 3)) {
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case 4:
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block[perm[i++]] = 0;
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case 0:
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block[perm[i++]] = 0;
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skip_bits(gb, 3);
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break;
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case 5:
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case 1:
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skip_bits(gb, 2);
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value = get_bits(gb, 6);
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for (j = 0; j < value; j++)
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block[perm[i++]] = 0;
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break;
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case 6:
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skip_bits(gb, 3);
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block[perm[i]] = -s->qtable[perm[i]];
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i++;
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break;
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case 2:
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skip_bits(gb, 3);
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block[perm[i]] = s->qtable[perm[i]];
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i++;
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break;
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case 7: // 111b
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case 3: // 011b
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skip_bits(gb, 2);
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if (show_bits(gb, 6) == 0x3F) {
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skip_bits(gb, 6);
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block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
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} else {
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block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
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}
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i++;
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break;
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}
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}
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block[0] += 128 << 4;
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}
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static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame,
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int mb_x, int mb_y)
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{
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int linesize = frame->linesize[0];
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uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
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uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
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uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
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ff_ea_idct_put_c(dest_y , linesize, block[0]);
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ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
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ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]);
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ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
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if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
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ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
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ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
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}
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}
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static inline void tgq_dconly(TgqContext *s, unsigned char *dst,
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int dst_stride, int dc)
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{
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int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
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int j;
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for (j = 0; j < 8; j++)
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memset(dst + j * dst_stride, level, 8);
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}
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static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame,
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int mb_x, int mb_y, const int8_t *dc)
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{
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int linesize = frame->linesize[0];
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uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
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uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
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uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
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tgq_dconly(s, dest_y, linesize, dc[0]);
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tgq_dconly(s, dest_y + 8, linesize, dc[1]);
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tgq_dconly(s, dest_y + 8 * linesize, linesize, dc[2]);
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tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]);
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if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
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tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]);
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tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]);
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}
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}
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static void tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x)
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{
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int mode;
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int i;
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int8_t dc[6];
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mode = bytestream2_get_byte(&s->gb);
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if (mode > 12) {
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GetBitContext gb;
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init_get_bits(&gb, s->gb.buffer, FFMIN(s->gb.buffer_end - s->gb.buffer, mode) * 8);
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for (i = 0; i < 6; i++)
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tgq_decode_block(s, s->block[i], &gb);
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tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
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bytestream2_skip(&s->gb, mode);
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} else {
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if (mode == 3) {
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memset(dc, bytestream2_get_byte(&s->gb), 4);
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dc[4] = bytestream2_get_byte(&s->gb);
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dc[5] = bytestream2_get_byte(&s->gb);
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} else if (mode == 6) {
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bytestream2_get_buffer(&s->gb, dc, 6);
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} else if (mode == 12) {
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for (i = 0; i < 6; i++) {
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dc[i] = bytestream2_get_byte(&s->gb);
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bytestream2_skip(&s->gb, 1);
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}
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} else {
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av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
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}
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tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
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}
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}
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static void tgq_calculate_qtable(TgqContext *s, int quant)
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{
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int i, j;
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const int a = (14 * (100 - quant)) / 100 + 1;
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const int b = (11 * (100 - quant)) / 100 + 4;
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for (j = 0; j < 8; j++)
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for (i = 0; i < 8; i++)
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s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
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ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
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}
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static int tgq_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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TgqContext *s = avctx->priv_data;
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AVFrame *frame = data;
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int x, y, ret;
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int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
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if (buf_size < 16) {
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av_log(avctx, AV_LOG_WARNING, "truncated header\n");
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return AVERROR_INVALIDDATA;
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}
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bytestream2_init(&s->gb, buf + 8, buf_size - 8);
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if (big_endian) {
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s->width = bytestream2_get_be16u(&s->gb);
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s->height = bytestream2_get_be16u(&s->gb);
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} else {
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s->width = bytestream2_get_le16u(&s->gb);
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s->height = bytestream2_get_le16u(&s->gb);
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}
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ret = ff_set_dimensions(s->avctx, s->width, s->height);
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if (ret < 0)
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return ret;
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tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
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bytestream2_skip(&s->gb, 3);
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return ret;
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}
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frame->key_frame = 1;
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frame->pict_type = AV_PICTURE_TYPE_I;
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for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
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for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
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tgq_decode_mb(s, frame, y, x);
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*got_frame = 1;
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return avpkt->size;
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}
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AVCodec ff_eatgq_decoder = {
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.name = "eatgq",
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.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_TGQ,
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.priv_data_size = sizeof(TgqContext),
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.init = tgq_decode_init,
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.decode = tgq_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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