aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* Copyright (c) 2008 Reimar Döffinger
*
* 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
*/
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "bsf.h"
static int text2movsub(AVBSFContext *ctx, AVPacket *out)
{
AVPacket *in;
int ret = 0;
ret = ff_bsf_get_packet(ctx, &in);
if (ret < 0)
return ret;
if (in->size > 0xffff) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
ret = av_new_packet(out, in->size + 2);
if (ret < 0) {
ret = AVERROR(ENOMEM);
goto fail;
}
ret = av_packet_copy_props(out, in);
if (ret < 0)
goto fail;
AV_WB16(out->data, in->size);
memcpy(out->data + 2, in->data, in->size);
fail:
if (ret < 0)
av_packet_unref(out);
av_packet_free(&in);
return ret;
}
const AVBitStreamFilter ff_text2movsub_bsf = {
.name = "text2movsub",
.filter = text2movsub,
};
static int mov2textsub(AVBSFContext *ctx, AVPacket *pkt)
{
int ret = 0;
ret = ff_bsf_get_packet_ref(ctx, pkt);
if (ret < 0)
return ret;
if (pkt->size < 2) {
av_packet_unref(pkt);
return AVERROR_INVALIDDATA;
}
pkt->size = FFMIN(pkt->size - 2, AV_RB16(pkt->data));
pkt->data += 2;
return 0;
}
const AVBitStreamFilter ff_mov2textsub_bsf = {
.name = "mov2textsub",
.filter = mov2textsub,
};
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