/* * Electronic Arts TQI Video Decoder * Copyright (c) 2007-2009 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 eatqi.c * Electronic Arts TQI Video Decoder * by Peter Ross <pross@xvid.org> * * Technical details here: * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI */ #include "avcodec.h" #include "bitstream.h" #include "dsputil.h" #include "aandcttab.h" #include "mpeg12.h" #include "mpegvideo.h" typedef struct TqiContext { MpegEncContext s; AVFrame frame; uint8_t *bitstream_buf; unsigned int bitstream_buf_size; DECLARE_ALIGNED_16(DCTELEM, block[6][64]); } TqiContext; static av_cold int tqi_decode_init(AVCodecContext *avctx) { TqiContext *t = avctx->priv_data; MpegEncContext *s = &t->s; 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->intra_scantable, ff_zigzag_direct); s->qscale = 1; avctx->time_base = (AVRational){1, 15}; avctx->pix_fmt = PIX_FMT_YUV420P; ff_mpeg12_init_vlcs(); return 0; } static int tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64]) { int n; s->dsp.clear_blocks(block[0]); for (n=0; n<6; n++) if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0) return -1; return 0; } static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64]) { MpegEncContext *s = &t->s; int linesize= t->frame.linesize[0]; uint8_t *dest_y = t->frame.data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16; uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8; uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->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, t->frame.linesize[1], block[4]); s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]); } } static void tqi_calculate_qtable(MpegEncContext *s, int quant) { const int qscale = (215 - 2*quant)*5; int i; if (s->avctx->idct_algo==FF_IDCT_EA) { s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11; for(i=1; i<64; i++) s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14; }else{ s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0]; for(i=1; i<64; i++) s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3; } } static int tqi_decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size) { const uint8_t *buf_end = buf+buf_size; TqiContext *t = avctx->priv_data; MpegEncContext *s = &t->s; s->width = AV_RL16(&buf[0]); s->height = AV_RL16(&buf[2]); tqi_calculate_qtable(s, buf[4]); buf += 8; if (t->frame.data[0]) avctx->release_buffer(avctx, &t->frame); if (s->avctx->width!=s->width || s->avctx->height!=s->height) avcodec_set_dimensions(s->avctx, s->width, s->height); if(avctx->get_buffer(avctx, &t->frame) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } t->bitstream_buf = av_fast_realloc(t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE); if (!t->bitstream_buf) return -1; s->dsp.bswap_buf((uint32_t*)t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4); init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf)); s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0; for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++) for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++) { if (tqi_decode_mb(s, t->block) < 0) break; tqi_idct_put(t, t->block); } *data_size = sizeof(AVFrame); *(AVFrame*)data = t->frame; return buf_size; } static av_cold int tqi_decode_end(AVCodecContext *avctx) { TqiContext *t = avctx->priv_data; if(t->frame.data[0]) avctx->release_buffer(avctx, &t->frame); av_free(t->bitstream_buf); return 0; } AVCodec eatqi_decoder = { "eatqi", CODEC_TYPE_VIDEO, CODEC_ID_TQI, sizeof(TqiContext), tqi_decode_init, NULL, tqi_decode_end, tqi_decode_frame, CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"), };