mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
b800327f4c
This commit does for AVInputFormat what commit59c9dc82f4did for AVOutputFormat: It adds a new type FFInputFormat, moves all the internals of AVInputFormat to it and adds a now reduced AVInputFormat as first member. This does not affect/improve extensibility of both public or private fields for demuxers (it is still a mess due to lavd). This is possible since50f34172e0(which removed the last usage of an internal field of AVInputFormat in fftools). (Hint: tools/probetest.c accesses the internals of FFInputFormat as well, but given that it is a testing tool this is not considered a problem.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/*
|
|
* Creative Voice File demuxer.
|
|
* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
|
|
*
|
|
* 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 "demux.h"
|
|
#include "voc.h"
|
|
#include "internal.h"
|
|
|
|
static int voc_probe(const AVProbeData *p)
|
|
{
|
|
int version, check;
|
|
|
|
if (memcmp(p->buf, ff_voc_magic, sizeof(ff_voc_magic) - 1))
|
|
return 0;
|
|
version = AV_RL16(p->buf + 22);
|
|
check = AV_RL16(p->buf + 24);
|
|
if (~version + 0x1234 != check)
|
|
return 10;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int voc_read_header(AVFormatContext *s)
|
|
{
|
|
VocDecContext *voc = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int header_size;
|
|
|
|
avio_skip(pb, 20);
|
|
header_size = avio_rl16(pb) - 22;
|
|
if (header_size != 4) {
|
|
av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size);
|
|
return AVERROR(ENOSYS);
|
|
}
|
|
avio_skip(pb, header_size);
|
|
|
|
s->ctx_flags |= AVFMTCTX_NOHEADER;
|
|
|
|
voc->remaining_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
if (!s->nb_streams) {
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
}
|
|
return ff_voc_get_packet(s, pkt, s->streams[0], 0);
|
|
}
|
|
|
|
static int voc_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t timestamp, int flags)
|
|
{
|
|
VocDecContext *voc = s->priv_data;
|
|
AVStream *st;
|
|
FFStream *sti;
|
|
int index;
|
|
|
|
if (s->nb_streams < 1) {
|
|
av_log(s, AV_LOG_ERROR, "cannot seek while no stream was found yet\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
st = s->streams[stream_index];
|
|
sti = ffstream(st);
|
|
index = av_index_search_timestamp(st, timestamp, flags);
|
|
|
|
if (index >= 0 && index < sti->nb_index_entries - 1) {
|
|
const AVIndexEntry *const e = &sti->index_entries[index];
|
|
avio_seek(s->pb, e->pos, SEEK_SET);
|
|
voc->pts = e->timestamp;
|
|
voc->remaining_size = e->size;
|
|
return 0;
|
|
} else if (sti->nb_index_entries && sti->index_entries[0].timestamp <= timestamp) {
|
|
const AVIndexEntry *const e = &sti->index_entries[sti->nb_index_entries - 1];
|
|
// prepare context for seek_frame_generic()
|
|
voc->pts = e->timestamp;
|
|
voc->remaining_size = e->size;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
const FFInputFormat ff_voc_demuxer = {
|
|
.p.name = "voc",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("Creative Voice"),
|
|
.p.codec_tag = ff_voc_codec_tags_list,
|
|
.priv_data_size = sizeof(VocDecContext),
|
|
.read_probe = voc_probe,
|
|
.read_header = voc_read_header,
|
|
.read_packet = voc_read_packet,
|
|
.read_seek = voc_read_seek,
|
|
};
|