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 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 "get_bits.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 void *bitstream_buf; 42 unsigned int bitstream_buf_size; 43 DECLARE_ALIGNED(16, DCTELEM, block)[6][64]; 44} TqiContext; 45 46static av_cold int tqi_decode_init(AVCodecContext *avctx) 47{ 48 TqiContext *t = avctx->priv_data; 49 MpegEncContext *s = &t->s; 50 s->avctx = avctx; 51 if(avctx->idct_algo==FF_IDCT_AUTO) 52 avctx->idct_algo=FF_IDCT_EA; 53 dsputil_init(&s->dsp, avctx); 54 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct); 55 s->qscale = 1; 56 avctx->time_base = (AVRational){1, 15}; 57 avctx->pix_fmt = PIX_FMT_YUV420P; 58 ff_mpeg12_init_vlcs(); 59 return 0; 60} 61 62static void tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64]) 63{ 64 int n; 65 s->dsp.clear_blocks(block[0]); 66 for (n=0; n<6; n++) 67 ff_mpeg1_decode_block_intra(s, block[n], n); 68} 69 70static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64]) 71{ 72 MpegEncContext *s = &t->s; 73 int linesize= t->frame.linesize[0]; 74 uint8_t *dest_y = t->frame.data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16; 75 uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8; 76 uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8; 77 78 s->dsp.idct_put(dest_y , linesize, block[0]); 79 s->dsp.idct_put(dest_y + 8, linesize, block[1]); 80 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]); 81 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]); 82 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) { 83 s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]); 84 s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]); 85 } 86} 87 88static void tqi_calculate_qtable(MpegEncContext *s, int quant) 89{ 90 const int qscale = (215 - 2*quant)*5; 91 int i; 92 if (s->avctx->idct_algo==FF_IDCT_EA) { 93 s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11; 94 for(i=1; i<64; i++) 95 s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14; 96 }else{ 97 s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0]; 98 for(i=1; i<64; i++) 99 s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3; 100 } 101} 102 103static int tqi_decode_frame(AVCodecContext *avctx, 104 void *data, int *data_size, 105 AVPacket *avpkt) 106{ 107 const uint8_t *buf = avpkt->data; 108 int buf_size = avpkt->size; 109 const uint8_t *buf_end = buf+buf_size; 110 TqiContext *t = avctx->priv_data; 111 MpegEncContext *s = &t->s; 112 113 s->width = AV_RL16(&buf[0]); 114 s->height = AV_RL16(&buf[2]); 115 tqi_calculate_qtable(s, buf[4]); 116 buf += 8; 117 118 if (t->frame.data[0]) 119 avctx->release_buffer(avctx, &t->frame); 120 121 if (s->avctx->width!=s->width || s->avctx->height!=s->height) 122 avcodec_set_dimensions(s->avctx, s->width, s->height); 123 124 if(avctx->get_buffer(avctx, &t->frame) < 0) { 125 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 126 return -1; 127 } 128 129 av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE); 130 if (!t->bitstream_buf) 131 return AVERROR(ENOMEM); 132 s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4); 133 init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf)); 134 135 s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0; 136 for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++) 137 for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++) 138 { 139 tqi_decode_mb(s, t->block); 140 tqi_idct_put(t, t->block); 141 } 142 143 *data_size = sizeof(AVFrame); 144 *(AVFrame*)data = t->frame; 145 return buf_size; 146} 147 148static av_cold int tqi_decode_end(AVCodecContext *avctx) 149{ 150 TqiContext *t = avctx->priv_data; 151 if(t->frame.data[0]) 152 avctx->release_buffer(avctx, &t->frame); 153 av_free(t->bitstream_buf); 154 return 0; 155} 156 157AVCodec eatqi_decoder = { 158 "eatqi", 159 AVMEDIA_TYPE_VIDEO, 160 CODEC_ID_TQI, 161 sizeof(TqiContext), 162 tqi_decode_init, 163 NULL, 164 tqi_decode_end, 165 tqi_decode_frame, 166 CODEC_CAP_DR1, 167 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"), 168}; 169