yading@10: /*
yading@10:  * Electronic Arts TQI Video Decoder
yading@10:  * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Electronic Arts TQI Video Decoder
yading@10:  * @author Peter Ross <pross@xvid.org>
yading@10:  * @see http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "get_bits.h"
yading@10: #include "aandcttab.h"
yading@10: #include "eaidct.h"
yading@10: #include "internal.h"
yading@10: #include "mpeg12.h"
yading@10: #include "mpegvideo.h"
yading@10: 
yading@10: typedef struct TqiContext {
yading@10:     MpegEncContext s;
yading@10:     void *bitstream_buf;
yading@10:     unsigned int bitstream_buf_size;
yading@10:     DECLARE_ALIGNED(16, int16_t, block)[6][64];
yading@10: } TqiContext;
yading@10: 
yading@10: static av_cold int tqi_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     TqiContext *t = avctx->priv_data;
yading@10:     MpegEncContext *s = &t->s;
yading@10:     s->avctx = avctx;
yading@10:     ff_dsputil_init(&s->dsp, avctx);
yading@10:     ff_init_scantable_permutation(s->dsp.idct_permutation, FF_NO_IDCT_PERM);
yading@10:     ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
yading@10:     s->qscale = 1;
yading@10:     avctx->time_base = (AVRational){1, 15};
yading@10:     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
yading@10:     ff_mpeg12_init_vlcs();
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int tqi_decode_mb(MpegEncContext *s, int16_t (*block)[64])
yading@10: {
yading@10:     int n;
yading@10:     s->dsp.clear_blocks(block[0]);
yading@10:     for (n=0; n<6; n++)
yading@10:         if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
yading@10:             return -1;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64])
yading@10: {
yading@10:     MpegEncContext *s = &t->s;
yading@10:     int linesize = frame->linesize[0];
yading@10:     uint8_t *dest_y  = frame->data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
yading@10:     uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8;
yading@10:     uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8;
yading@10: 
yading@10:     ff_ea_idct_put_c(dest_y                 , linesize, block[0]);
yading@10:     ff_ea_idct_put_c(dest_y              + 8, linesize, block[1]);
yading@10:     ff_ea_idct_put_c(dest_y + 8*linesize    , linesize, block[2]);
yading@10:     ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
yading@10:     if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
yading@10:         ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
yading@10:         ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void tqi_calculate_qtable(MpegEncContext *s, int quant)
yading@10: {
yading@10:     const int qscale = (215 - 2*quant)*5;
yading@10:     int i;
yading@10:     s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
yading@10:     for(i=1; i<64; i++)
yading@10:         s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
yading@10: }
yading@10: 
yading@10: static int tqi_decode_frame(AVCodecContext *avctx,
yading@10:                             void *data, int *got_frame,
yading@10:                             AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size = avpkt->size;
yading@10:     const uint8_t *buf_end = buf+buf_size;
yading@10:     TqiContext *t = avctx->priv_data;
yading@10:     MpegEncContext *s = &t->s;
yading@10:     AVFrame *frame = data;
yading@10:     int ret;
yading@10: 
yading@10:     s->width  = AV_RL16(&buf[0]);
yading@10:     s->height = AV_RL16(&buf[2]);
yading@10:     tqi_calculate_qtable(s, buf[4]);
yading@10:     buf += 8;
yading@10: 
yading@10:     if (s->avctx->width!=s->width || s->avctx->height!=s->height)
yading@10:         avcodec_set_dimensions(s->avctx, s->width, s->height);
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
yading@10:                           buf_end - buf);
yading@10:     if (!t->bitstream_buf)
yading@10:         return AVERROR(ENOMEM);
yading@10:     s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
yading@10:     init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
yading@10: 
yading@10:     s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
yading@10:     for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
yading@10:     for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
yading@10:     {
yading@10:         if (tqi_decode_mb(s, t->block) < 0)
yading@10:             goto end;
yading@10:         tqi_idct_put(t, frame, t->block);
yading@10:     }
yading@10:     end:
yading@10: 
yading@10:     *got_frame = 1;
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static av_cold int tqi_decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     TqiContext *t = avctx->priv_data;
yading@10:     av_free(t->bitstream_buf);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_eatqi_decoder = {
yading@10:     .name           = "eatqi",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_TQI,
yading@10:     .priv_data_size = sizeof(TqiContext),
yading@10:     .init           = tqi_decode_init,
yading@10:     .close          = tqi_decode_end,
yading@10:     .decode         = tqi_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
yading@10: };