| /* |
| * 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 libavcodec/eatgq.c |
| * Electronic Arts TGQ Video Decoder |
| * @author Peter Ross <pross@xvid.org> |
| * |
| * Technical details here: |
| * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ |
| */ |
| |
| #include "avcodec.h" |
| #define ALT_BITSTREAM_READER_LE |
| #include "bitstream.h" |
| #include "bytestream.h" |
| #include "dsputil.h" |
| #include "aandcttab.h" |
| |
| typedef struct TgqContext { |
| AVCodecContext *avctx; |
| DSPContext dsp; |
| AVFrame frame; |
| int width,height; |
| ScanTable scantable; |
| int qtable[64]; |
| } TgqContext; |
| |
| static av_cold int tgq_decode_init(AVCodecContext *avctx){ |
| TgqContext *s = avctx->priv_data; |
| s->avctx = avctx; |
| if(avctx->idct_algo==FF_IDCT_AUTO) |
| avctx->idct_algo=FF_IDCT_EA; |
| dsputil_init(&s->dsp, avctx); |
| ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct); |
| avctx->time_base = (AVRational){1, 15}; |
| avctx->pix_fmt = PIX_FMT_YUV420P; |
| return 0; |
| } |
| |
| static void tgq_decode_block(TgqContext *s, DCTELEM 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, DCTELEM (*block)[64], int mb_x, int mb_y){ |
| int linesize= s->frame.linesize[0]; |
| uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16; |
| uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8; |
| uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8; |
| |
| s->dsp.idct_put(dest_y , linesize, block[0]); |
| s->dsp.idct_put(dest_y + 8, linesize, block[1]); |
| s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]); |
| s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]); |
| if(!(s->avctx->flags&CODEC_FLAG_GRAY)){ |
| s->dsp.idct_put(dest_cb, s->frame.linesize[1], block[4]); |
| s->dsp.idct_put(dest_cr, s->frame.linesize[2], block[5]); |
| } |
| } |
| |
| static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int 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, int mb_x, int mb_y, const int8_t *dc) |
| { |
| int linesize= s->frame.linesize[0]; |
| uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16; |
| uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8; |
| uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->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&CODEC_FLAG_GRAY)) { |
| tgq_dconly(s,dest_cb, s->frame.linesize[1], dc[4]); |
| tgq_dconly(s,dest_cr, s->frame.linesize[2], dc[5]); |
| } |
| } |
| |
| static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x, const int8_t **bs, const int8_t *buf_end){ |
| int mode; |
| int i; |
| int8_t dc[6]; |
| DCTELEM block[6][64]; |
| |
| mode = bytestream_get_byte((const uint8_t**)bs); |
| if (mode>buf_end-*bs) { |
| av_log(s->avctx, AV_LOG_ERROR, "truncated macroblock\n"); |
| return; |
| } |
| |
| if (mode>12) { |
| GetBitContext gb; |
| init_get_bits(&gb, *bs, mode*8); |
| for(i=0; i<6; i++) |
| tgq_decode_block(s, block[i], &gb); |
| tgq_idct_put_mb(s, block, mb_x, mb_y); |
| }else{ |
| if (mode==3) { |
| memset(dc, (*bs)[0], 4); |
| dc[4] = (*bs)[1]; |
| dc[5] = (*bs)[2]; |
| }else if (mode==6) { |
| memcpy(dc, *bs, 6); |
| }else if (mode==12) { |
| for(i=0; i<6; i++) |
| dc[i] = (*bs)[i*2]; |
| }else{ |
| av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode); |
| } |
| tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc); |
| } |
| *bs += mode; |
| } |
| |
| 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++) |
| if (s->avctx->idct_algo==FF_IDCT_EA) |
| s->qtable[j*8+i] = ((a*(j+i)/(7+7) + b)*ff_inv_aanscales[j*8+i])>>(14-4); |
| else |
| s->qtable[j*8+i] = (a*(j+i)/(7+7) + b)<<3; |
| } |
| |
| static int tgq_decode_frame(AVCodecContext *avctx, |
| void *data, int *data_size, |
| const uint8_t *buf, int buf_size){ |
| const uint8_t *buf_start = buf; |
| const uint8_t *buf_end = buf + buf_size; |
| TgqContext *s = avctx->priv_data; |
| int x,y; |
| |
| int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF; |
| buf += 8; |
| |
| if(8>buf_end-buf) { |
| av_log(avctx, AV_LOG_WARNING, "truncated header\n"); |
| return -1; |
| } |
| s->width = big_endian ? AV_RB16(&buf[0]) : AV_RL16(&buf[0]); |
| s->height = big_endian ? AV_RB16(&buf[2]) : AV_RL16(&buf[2]); |
| |
| if (s->avctx->width!=s->width || s->avctx->height!=s->height) { |
| avcodec_set_dimensions(s->avctx, s->width, s->height); |
| if (s->frame.data[0]) |
| avctx->release_buffer(avctx, &s->frame); |
| } |
| tgq_calculate_qtable(s, buf[4]); |
| buf += 8; |
| |
| if (!s->frame.data[0]) { |
| s->frame.key_frame = 1; |
| s->frame.pict_type = FF_I_TYPE; |
| s->frame.buffer_hints = FF_BUFFER_HINTS_VALID; |
| if (avctx->get_buffer(avctx, &s->frame)) { |
| av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
| return -1; |
| } |
| } |
| |
| for (y=0; y<(avctx->height+15)/16; y++) |
| for (x=0; x<(avctx->width+15)/16; x++) |
| tgq_decode_mb(s, y, x, (const int8_t**)&buf, (const int8_t*)buf_end); |
| |
| *data_size = sizeof(AVFrame); |
| *(AVFrame*)data = s->frame; |
| |
| return buf-buf_start; |
| } |
| |
| static av_cold int tgq_decode_end(AVCodecContext *avctx){ |
| TgqContext *s = avctx->priv_data; |
| if (s->frame.data[0]) |
| s->avctx->release_buffer(avctx, &s->frame); |
| return 0; |
| } |
| |
| AVCodec eatgq_decoder = { |
| "eatgq", |
| CODEC_TYPE_VIDEO, |
| CODEC_ID_TGQ, |
| sizeof(TgqContext), |
| tgq_decode_init, |
| NULL, |
| tgq_decode_end, |
| tgq_decode_frame, |
| CODEC_CAP_DR1, |
| .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"), |
| }; |
