forked from etc/pineapple-src
87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2018 Paul B Mahol
|
||
|
|
*
|
||
|
|
* 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 "bsf.h"
|
||
|
|
#include "bsf_internal.h"
|
||
|
|
#include "get_bits.h"
|
||
|
|
#include "ac3_parser_internal.h"
|
||
|
|
|
||
|
|
static int eac3_core_filter(AVBSFContext *ctx, AVPacket *pkt)
|
||
|
|
{
|
||
|
|
AC3HeaderInfo hdr;
|
||
|
|
GetBitContext gbc;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = ff_bsf_get_packet_ref(ctx, pkt);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
ret = init_get_bits8(&gbc, pkt->data, pkt->size);
|
||
|
|
if (ret < 0)
|
||
|
|
goto fail;
|
||
|
|
|
||
|
|
ret = ff_ac3_parse_header(&gbc, &hdr);
|
||
|
|
if (ret < 0) {
|
||
|
|
ret = AVERROR_INVALIDDATA;
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (hdr.frame_type == EAC3_FRAME_TYPE_INDEPENDENT ||
|
||
|
|
hdr.frame_type == EAC3_FRAME_TYPE_AC3_CONVERT) {
|
||
|
|
pkt->size = FFMIN(hdr.frame_size, pkt->size);
|
||
|
|
} else if (hdr.frame_type == EAC3_FRAME_TYPE_DEPENDENT && pkt->size > hdr.frame_size) {
|
||
|
|
AC3HeaderInfo hdr2;
|
||
|
|
|
||
|
|
ret = init_get_bits8(&gbc, pkt->data + hdr.frame_size, pkt->size - hdr.frame_size);
|
||
|
|
if (ret < 0)
|
||
|
|
goto fail;
|
||
|
|
|
||
|
|
ret = ff_ac3_parse_header(&gbc, &hdr2);
|
||
|
|
if (ret < 0) {
|
||
|
|
ret = AVERROR_INVALIDDATA;
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (hdr2.frame_type == EAC3_FRAME_TYPE_INDEPENDENT ||
|
||
|
|
hdr2.frame_type == EAC3_FRAME_TYPE_AC3_CONVERT) {
|
||
|
|
pkt->size -= hdr.frame_size;
|
||
|
|
pkt->data += hdr.frame_size;
|
||
|
|
} else {
|
||
|
|
pkt->size = 0;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
pkt->size = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
fail:
|
||
|
|
av_packet_unref(pkt);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const enum AVCodecID codec_ids[] = {
|
||
|
|
AV_CODEC_ID_EAC3, AV_CODEC_ID_NONE,
|
||
|
|
};
|
||
|
|
|
||
|
|
const AVBitStreamFilter ff_eac3_core_bsf = {
|
||
|
|
.name = "eac3_core",
|
||
|
|
.filter = eac3_core_filter,
|
||
|
|
.codec_ids = codec_ids,
|
||
|
|
};
|