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70d54392f5
The new lowres support is limited to decoders where lowres decoding is possible in high quality. I was not able to measure any speed difference, but if one is found the 2-3 lines that might affect speed can be made compile time conditional Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/*
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* Sunplus JPEG decoder (SP5X)
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* Copyright (c) 2003 Alex Beregszaszi
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Sunplus JPEG decoder (SP5X).
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*/
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#include "avcodec.h"
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#include "mjpeg.h"
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#include "mjpegdec.h"
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#include "sp5x.h"
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static int sp5x_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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AVPacket avpkt_recoded;
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const int qscale = 5;
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uint8_t *recoded;
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int i = 0, j = 0;
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if (!avctx->width || !avctx->height)
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return -1;
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recoded = av_mallocz(buf_size + 1024);
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if (!recoded)
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return -1;
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/* SOI */
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recoded[j++] = 0xFF;
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recoded[j++] = 0xD8;
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memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
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memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
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memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
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j += sizeof(sp5x_data_dqt);
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memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
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j += sizeof(sp5x_data_dht);
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memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
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AV_WB16(recoded+j+5, avctx->coded_height);
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AV_WB16(recoded+j+7, avctx->coded_width);
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j += sizeof(sp5x_data_sof);
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memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
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j += sizeof(sp5x_data_sos);
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if(avctx->codec_id==CODEC_ID_AMV)
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for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
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recoded[j++] = buf[i];
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else
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for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
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{
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recoded[j++] = buf[i];
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if (buf[i] == 0xff)
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recoded[j++] = 0;
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}
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/* EOI */
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recoded[j++] = 0xFF;
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recoded[j++] = 0xD9;
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av_init_packet(&avpkt_recoded);
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avpkt_recoded.data = recoded;
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avpkt_recoded.size = j;
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i = ff_mjpeg_decode_frame(avctx, data, data_size, &avpkt_recoded);
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av_free(recoded);
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return i;
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}
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AVCodec ff_sp5x_decoder = {
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.name = "sp5x",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_SP5X,
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.priv_data_size = sizeof(MJpegDecodeContext),
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.init = ff_mjpeg_decode_init,
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.close = ff_mjpeg_decode_end,
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.decode = sp5x_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.max_lowres = 3,
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.long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
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};
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AVCodec ff_amv_decoder = {
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.name = "amv",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_AMV,
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.priv_data_size = sizeof(MJpegDecodeContext),
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.init = ff_mjpeg_decode_init,
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.close = ff_mjpeg_decode_end,
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.decode = sp5x_decode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
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};
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