yading@10: /*
yading@10:  * Sunplus JPEG decoder (SP5X)
yading@10:  * Copyright (c) 2003 Alex Beregszaszi
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 Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Sunplus JPEG decoder (SP5X).
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "mjpeg.h"
yading@10: #include "mjpegdec.h"
yading@10: #include "sp5x.h"
yading@10: 
yading@10: 
yading@10: static int sp5x_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:     AVPacket avpkt_recoded;
yading@10:     const int qscale = 5;
yading@10:     uint8_t *recoded;
yading@10:     int i = 0, j = 0;
yading@10: 
yading@10:     if (!avctx->width || !avctx->height)
yading@10:         return -1;
yading@10: 
yading@10:     recoded = av_mallocz(buf_size + 1024);
yading@10:     if (!recoded)
yading@10:         return -1;
yading@10: 
yading@10:     /* SOI */
yading@10:     recoded[j++] = 0xFF;
yading@10:     recoded[j++] = 0xD8;
yading@10: 
yading@10:     memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
yading@10:     memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
yading@10:     memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
yading@10:     j += sizeof(sp5x_data_dqt);
yading@10: 
yading@10:     memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
yading@10:     j += sizeof(sp5x_data_dht);
yading@10: 
yading@10:     memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
yading@10:     AV_WB16(recoded+j+5, avctx->coded_height);
yading@10:     AV_WB16(recoded+j+7, avctx->coded_width);
yading@10:     j += sizeof(sp5x_data_sof);
yading@10: 
yading@10:     memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
yading@10:     j += sizeof(sp5x_data_sos);
yading@10: 
yading@10:     if(avctx->codec_id==AV_CODEC_ID_AMV)
yading@10:         for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
yading@10:             recoded[j++] = buf[i];
yading@10:     else
yading@10:     for (i = 14; i < buf_size && j < buf_size+1024-3; i++)
yading@10:     {
yading@10:         recoded[j++] = buf[i];
yading@10:         if (buf[i] == 0xff)
yading@10:             recoded[j++] = 0;
yading@10:     }
yading@10: 
yading@10:     /* EOI */
yading@10:     recoded[j++] = 0xFF;
yading@10:     recoded[j++] = 0xD9;
yading@10: 
yading@10:     av_init_packet(&avpkt_recoded);
yading@10:     avpkt_recoded.data = recoded;
yading@10:     avpkt_recoded.size = j;
yading@10:     i = ff_mjpeg_decode_frame(avctx, data, got_frame, &avpkt_recoded);
yading@10: 
yading@10:     av_free(recoded);
yading@10: 
yading@10:     return i < 0 ? i : avpkt->size;
yading@10: }
yading@10: 
yading@10: #if CONFIG_SP5X_DECODER
yading@10: AVCodec ff_sp5x_decoder = {
yading@10:     .name           = "sp5x",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_SP5X,
yading@10:     .priv_data_size = sizeof(MJpegDecodeContext),
yading@10:     .init           = ff_mjpeg_decode_init,
yading@10:     .close          = ff_mjpeg_decode_end,
yading@10:     .decode         = sp5x_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .max_lowres     = 3,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
yading@10: };
yading@10: #endif
yading@10: #if CONFIG_AMV_DECODER
yading@10: AVCodec ff_amv_decoder = {
yading@10:     .name           = "amv",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_AMV,
yading@10:     .priv_data_size = sizeof(MJpegDecodeContext),
yading@10:     .init           = ff_mjpeg_decode_init,
yading@10:     .close          = ff_mjpeg_decode_end,
yading@10:     .decode         = sp5x_decode_frame,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("AMV Video"),
yading@10: };
yading@10: #endif