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This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
126 lines
3.8 KiB
C
126 lines
3.8 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 "config_components.h"
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#include "avcodec.h"
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#include "codec_internal.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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int ff_sp5x_process_packet(AVCodecContext *avctx, 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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AVBufferRef *buf_recoded;
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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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buf_recoded = av_buffer_allocz(buf_size + 1024);
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if (!buf_recoded)
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return -1;
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recoded = buf_recoded->data;
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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_qscale_five_quant_table[0], 64);
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memcpy(recoded + j + 70, &sp5x_qscale_five_quant_table[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==AV_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+1024-3; 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_buffer_unref(&avpkt->buf);
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avpkt->buf = buf_recoded;
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avpkt->data = recoded;
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avpkt->size = j;
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return 0;
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}
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#if CONFIG_SP5X_DECODER
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const FFCodec ff_sp5x_decoder = {
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.p.name = "sp5x",
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.p.long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_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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FF_CODEC_RECEIVE_FRAME_CB(ff_mjpeg_receive_frame),
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.p.capabilities = AV_CODEC_CAP_DR1,
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.p.max_lowres = 3,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP |
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FF_CODEC_CAP_SETS_PKT_DTS,
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};
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#endif
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#if CONFIG_AMV_DECODER
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const FFCodec ff_amv_decoder = {
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.p.name = "amv",
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.p.long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_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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FF_CODEC_RECEIVE_FRAME_CB(ff_mjpeg_receive_frame),
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.p.max_lowres = 3,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP |
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FF_CODEC_CAP_SETS_PKT_DTS,
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};
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#endif
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