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251 lines
8.3 KiB
251 lines
8.3 KiB
/* |
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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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#define BITSTREAM_READER_LE |
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#include "aandcttab.h" |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "eaidct.h" |
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#include "get_bits.h" |
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#include "idctdsp.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->framerate = (AVRational){ 15, 1 }; |
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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 & AV_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 & AV_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 = AV_CODEC_CAP_DR1, |
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};
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