1/* 2 * Electronic Arts TQI Video Decoder 3 * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file eatqi.c 24 * Electronic Arts TQI Video Decoder 25 * by Peter Ross <pross@xvid.org> 26 * 27 * Technical details here: 28 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI 29 */ 30 31#include "avcodec.h" 32#include "bitstream.h" 33#include "dsputil.h" 34#include "aandcttab.h" 35#include "mpeg12.h" 36#include "mpegvideo.h" 37 38typedef struct TqiContext { 39 MpegEncContext s; 40 AVFrame frame; 41 uint8_t *bitstream_buf; 42 unsigned int bitstream_buf_size; 43} TqiContext; 44 45static av_cold int tqi_decode_init(AVCodecContext *avctx) 46{ 47 TqiContext *t = avctx->priv_data; 48 MpegEncContext *s = &t->s; 49 s->avctx = avctx; 50 if(avctx->idct_algo==FF_IDCT_AUTO) 51 avctx->idct_algo=FF_IDCT_EA; 52 dsputil_init(&s->dsp, avctx); 53 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct); 54 s->qscale = 1; 55 avctx->time_base = (AVRational){1, 15}; 56 avctx->pix_fmt = PIX_FMT_YUV420P; 57 ff_mpeg12_init_vlcs(); 58 return 0; 59} 60 61static void tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64]) 62{ 63 int n; 64 s->dsp.clear_blocks(block[0]); 65 for (n=0; n<6; n++) 66 ff_mpeg1_decode_block_intra(s, block[n], n); 67} 68 69static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64]) 70{ 71 MpegEncContext *s = &t->s; 72 int linesize= t->frame.linesize[0]; 73 uint8_t *dest_y = t->frame.data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16; 74 uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8; 75 uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8; 76 77 s->dsp.idct_put(dest_y , linesize, block[0]); 78 s->dsp.idct_put(dest_y + 8, linesize, block[1]); 79 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]); 80 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]); 81 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) { 82 s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]); 83 s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]); 84 } 85} 86 87static void tqi_calculate_qtable(MpegEncContext *s, int quant) 88{ 89 const int qscale = (215 - 2*quant)*5; 90 int i; 91 if (s->avctx->idct_algo==FF_IDCT_EA) { 92 s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11; 93 for(i=1; i<64; i++) 94 s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14; 95 }else{ 96 s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0]; 97 for(i=1; i<64; i++) 98 s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3; 99 } 100} 101 102static int tqi_decode_frame(AVCodecContext *avctx, 103 void *data, int *data_size, 104 const uint8_t *buf, int buf_size) 105{ 106 const uint8_t *buf_end = buf+buf_size; 107 TqiContext *t = avctx->priv_data; 108 MpegEncContext *s = &t->s; 109 DECLARE_ALIGNED_16(DCTELEM, block[6][64]); 110 111 s->width = AV_RL16(&buf[0]); 112 s->height = AV_RL16(&buf[2]); 113 tqi_calculate_qtable(s, buf[4]); 114 buf += 8; 115 116 if (t->frame.data[0]) 117 avctx->release_buffer(avctx, &t->frame); 118 119 if (s->avctx->width!=s->width || s->avctx->height!=s->height) 120 avcodec_set_dimensions(s->avctx, s->width, s->height); 121 122 if(avctx->get_buffer(avctx, &t->frame) < 0) { 123 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 124 return -1; 125 } 126 127 t->bitstream_buf = av_fast_realloc(t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE); 128 if (!t->bitstream_buf) 129 return -1; 130 s->dsp.bswap_buf((uint32_t*)t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4); 131 init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf)); 132 133 s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0; 134 for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++) 135 for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++) 136 { 137 tqi_decode_mb(s, block); 138 tqi_idct_put(t, block); 139 } 140 141 *data_size = sizeof(AVFrame); 142 *(AVFrame*)data = t->frame; 143 return buf_size; 144} 145 146static av_cold int tqi_decode_end(AVCodecContext *avctx) 147{ 148 TqiContext *t = avctx->priv_data; 149 if(t->frame.data[0]) 150 avctx->release_buffer(avctx, &t->frame); 151 av_free(t->bitstream_buf); 152 return 0; 153} 154 155AVCodec eatqi_decoder = { 156 "eatqi", 157 CODEC_TYPE_VIDEO, 158 CODEC_ID_TQI, 159 sizeof(TqiContext), 160 tqi_decode_init, 161 NULL, 162 tqi_decode_end, 163 tqi_decode_frame, 164 CODEC_CAP_DR1, 165 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"), 166}; 167