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FFmpeg/libavcodec/sp5xdec.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

124 lines
3.7 KiB
C

/*
* Sunplus JPEG decoder (SP5X)
* Copyright (c) 2003 Alex Beregszaszi
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Sunplus JPEG decoder (SP5X).
*/
#include "avcodec.h"
#include "internal.h"
#include "mjpeg.h"
#include "mjpegdec.h"
#include "sp5x.h"
int ff_sp5x_process_packet(AVCodecContext *avctx, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AVBufferRef *buf_recoded;
uint8_t *recoded;
int i = 0, j = 0;
if (!avctx->width || !avctx->height)
return -1;
buf_recoded = av_buffer_allocz(buf_size + 1024);
if (!buf_recoded)
return -1;
recoded = buf_recoded->data;
/* SOI */
recoded[j++] = 0xFF;
recoded[j++] = 0xD8;
memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
memcpy(recoded + j + 5, &sp5x_qscale_five_quant_table[0], 64);
memcpy(recoded + j + 70, &sp5x_qscale_five_quant_table[1], 64);
j += sizeof(sp5x_data_dqt);
memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
j += sizeof(sp5x_data_dht);
memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
AV_WB16(recoded+j+5, avctx->coded_height);
AV_WB16(recoded+j+7, avctx->coded_width);
j += sizeof(sp5x_data_sof);
memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
j += sizeof(sp5x_data_sos);
if(avctx->codec_id==AV_CODEC_ID_AMV)
for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
recoded[j++] = buf[i];
else
for (i = 14; i < buf_size && j < buf_size+1024-3; i++)
{
recoded[j++] = buf[i];
if (buf[i] == 0xff)
recoded[j++] = 0;
}
/* EOI */
recoded[j++] = 0xFF;
recoded[j++] = 0xD9;
av_buffer_unref(&avpkt->buf);
avpkt->buf = buf_recoded;
avpkt->data = recoded;
avpkt->size = j;
return 0;
}
#if CONFIG_SP5X_DECODER
const AVCodec ff_sp5x_decoder = {
.name = "sp5x",
.long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_SP5X,
.priv_data_size = sizeof(MJpegDecodeContext),
.init = ff_mjpeg_decode_init,
.close = ff_mjpeg_decode_end,
.receive_frame = ff_mjpeg_receive_frame,
.capabilities = AV_CODEC_CAP_DR1,
.max_lowres = 3,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP |
FF_CODEC_CAP_SETS_PKT_DTS,
};
#endif
#if CONFIG_AMV_DECODER
const AVCodec ff_amv_decoder = {
.name = "amv",
.long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_AMV,
.priv_data_size = sizeof(MJpegDecodeContext),
.init = ff_mjpeg_decode_init,
.close = ff_mjpeg_decode_end,
.receive_frame = ff_mjpeg_receive_frame,
.max_lowres = 3,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP |
FF_CODEC_CAP_SETS_PKT_DTS,
};
#endif