mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
fed0282508
Do this by allocating AVFormatContext together with the data that is currently in AVFormatInternal; or rather: Put AVFormatContext at the beginning of a new structure called FFFormatContext (which encompasses more than just the internal fields and is a proper context in its own right, hence the name) and remove AVFormatInternal altogether. The biggest simplifications occured in avformat_alloc_context(), where one can now simply call avformat_free_context() in case of errors. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
/*
|
|
* HCA demuxer
|
|
* Copyright (c) 2020 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 "libavutil/intreadwrite.h"
|
|
#include "libavcodec/bytestream.h"
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
static int hca_probe(const AVProbeData *p)
|
|
{
|
|
if (AV_RL32(p->buf) != MKTAG('H', 'C', 'A', 0))
|
|
return 0;
|
|
|
|
if (AV_RL32(p->buf + 8) != MKTAG('f', 'm', 't', 0))
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX / 3;
|
|
}
|
|
|
|
static int hca_read_header(AVFormatContext *s)
|
|
{
|
|
AVCodecParameters *par;
|
|
GetByteContext gb;
|
|
AVIOContext *pb = s->pb;
|
|
AVStream *st;
|
|
uint32_t chunk;
|
|
uint16_t version;
|
|
uint32_t block_count;
|
|
uint16_t block_size, data_offset;
|
|
int ret;
|
|
|
|
avio_skip(pb, 4);
|
|
version = avio_rb16(pb);
|
|
|
|
data_offset = avio_rb16(pb);
|
|
if (data_offset <= 8)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
par = st->codecpar;
|
|
ret = ff_alloc_extradata(par, data_offset);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = avio_read(pb, par->extradata + 8, par->extradata_size - 8);
|
|
if (ret < par->extradata_size - 8)
|
|
return AVERROR(EIO);
|
|
AV_WL32(par->extradata, MKTAG('H', 'C', 'A', 0));
|
|
AV_WB16(par->extradata + 4, version);
|
|
AV_WB16(par->extradata + 6, data_offset);
|
|
|
|
bytestream2_init(&gb, par->extradata + 8, par->extradata_size - 8);
|
|
|
|
if (bytestream2_get_le32(&gb) != MKTAG('f', 'm', 't', 0))
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
par->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
par->codec_id = AV_CODEC_ID_HCA;
|
|
par->codec_tag = 0;
|
|
par->channels = bytestream2_get_byte(&gb);
|
|
par->sample_rate = bytestream2_get_be24(&gb);
|
|
block_count = bytestream2_get_be32(&gb);
|
|
bytestream2_skip(&gb, 4);
|
|
chunk = bytestream2_get_le32(&gb);
|
|
if (chunk == MKTAG('c', 'o', 'm', 'p')) {
|
|
block_size = bytestream2_get_be16(&gb);
|
|
} else if (chunk == MKTAG('d', 'e', 'c', 0)) {
|
|
block_size = bytestream2_get_be16(&gb);
|
|
} else {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (block_size < 8)
|
|
return AVERROR_INVALIDDATA;
|
|
par->block_align = block_size;
|
|
st->duration = 1024 * block_count;
|
|
|
|
avio_seek(pb, data_offset, SEEK_SET);
|
|
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hca_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVCodecParameters *par = s->streams[0]->codecpar;
|
|
int ret;
|
|
|
|
ret = av_get_packet(s->pb, pkt, par->block_align);
|
|
pkt->duration = 1024;
|
|
return ret;
|
|
}
|
|
|
|
const AVInputFormat ff_hca_demuxer = {
|
|
.name = "hca",
|
|
.long_name = NULL_IF_CONFIG_SMALL("CRI HCA"),
|
|
.read_probe = hca_probe,
|
|
.read_header = hca_read_header,
|
|
.read_packet = hca_read_packet,
|
|
.extensions = "hca",
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|