Libav 0.7.1
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00001 /* 00002 * Electronic Arts TQI Video Decoder 00003 * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org> 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00031 #include "avcodec.h" 00032 #include "get_bits.h" 00033 #include "dsputil.h" 00034 #include "aandcttab.h" 00035 #include "mpeg12.h" 00036 #include "mpegvideo.h" 00037 00038 typedef struct TqiContext { 00039 MpegEncContext s; 00040 AVFrame frame; 00041 void *bitstream_buf; 00042 unsigned int bitstream_buf_size; 00043 DECLARE_ALIGNED(16, DCTELEM, block)[6][64]; 00044 } TqiContext; 00045 00046 static av_cold int tqi_decode_init(AVCodecContext *avctx) 00047 { 00048 TqiContext *t = avctx->priv_data; 00049 MpegEncContext *s = &t->s; 00050 s->avctx = avctx; 00051 if(avctx->idct_algo==FF_IDCT_AUTO) 00052 avctx->idct_algo=FF_IDCT_EA; 00053 dsputil_init(&s->dsp, avctx); 00054 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct); 00055 s->qscale = 1; 00056 avctx->time_base = (AVRational){1, 15}; 00057 avctx->pix_fmt = PIX_FMT_YUV420P; 00058 ff_mpeg12_init_vlcs(); 00059 return 0; 00060 } 00061 00062 static int tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64]) 00063 { 00064 int n; 00065 s->dsp.clear_blocks(block[0]); 00066 for (n=0; n<6; n++) 00067 if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0) 00068 return -1; 00069 00070 return 0; 00071 } 00072 00073 static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64]) 00074 { 00075 MpegEncContext *s = &t->s; 00076 int linesize= t->frame.linesize[0]; 00077 uint8_t *dest_y = t->frame.data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16; 00078 uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8; 00079 uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8; 00080 00081 s->dsp.idct_put(dest_y , linesize, block[0]); 00082 s->dsp.idct_put(dest_y + 8, linesize, block[1]); 00083 s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]); 00084 s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]); 00085 if(!(s->avctx->flags&CODEC_FLAG_GRAY)) { 00086 s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]); 00087 s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]); 00088 } 00089 } 00090 00091 static void tqi_calculate_qtable(MpegEncContext *s, int quant) 00092 { 00093 const int qscale = (215 - 2*quant)*5; 00094 int i; 00095 if (s->avctx->idct_algo==FF_IDCT_EA) { 00096 s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11; 00097 for(i=1; i<64; i++) 00098 s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14; 00099 }else{ 00100 s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0]; 00101 for(i=1; i<64; i++) 00102 s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3; 00103 } 00104 } 00105 00106 static int tqi_decode_frame(AVCodecContext *avctx, 00107 void *data, int *data_size, 00108 AVPacket *avpkt) 00109 { 00110 const uint8_t *buf = avpkt->data; 00111 int buf_size = avpkt->size; 00112 const uint8_t *buf_end = buf+buf_size; 00113 TqiContext *t = avctx->priv_data; 00114 MpegEncContext *s = &t->s; 00115 00116 s->width = AV_RL16(&buf[0]); 00117 s->height = AV_RL16(&buf[2]); 00118 tqi_calculate_qtable(s, buf[4]); 00119 buf += 8; 00120 00121 if (t->frame.data[0]) 00122 avctx->release_buffer(avctx, &t->frame); 00123 00124 if (s->avctx->width!=s->width || s->avctx->height!=s->height) 00125 avcodec_set_dimensions(s->avctx, s->width, s->height); 00126 00127 if(avctx->get_buffer(avctx, &t->frame) < 0) { 00128 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 00129 return -1; 00130 } 00131 00132 av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE); 00133 if (!t->bitstream_buf) 00134 return AVERROR(ENOMEM); 00135 s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4); 00136 init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf)); 00137 00138 s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0; 00139 for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++) 00140 for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++) 00141 { 00142 if (tqi_decode_mb(s, t->block) < 0) 00143 break; 00144 tqi_idct_put(t, t->block); 00145 } 00146 00147 *data_size = sizeof(AVFrame); 00148 *(AVFrame*)data = t->frame; 00149 return buf_size; 00150 } 00151 00152 static av_cold int tqi_decode_end(AVCodecContext *avctx) 00153 { 00154 TqiContext *t = avctx->priv_data; 00155 if(t->frame.data[0]) 00156 avctx->release_buffer(avctx, &t->frame); 00157 av_free(t->bitstream_buf); 00158 return 0; 00159 } 00160 00161 AVCodec ff_eatqi_decoder = { 00162 "eatqi", 00163 AVMEDIA_TYPE_VIDEO, 00164 CODEC_ID_TQI, 00165 sizeof(TqiContext), 00166 tqi_decode_init, 00167 NULL, 00168 tqi_decode_end, 00169 tqi_decode_frame, 00170 CODEC_CAP_DR1, 00171 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"), 00172 };