lavf: add subfile protocol.
This commit is contained in:
parent
bc6901c949
commit
97e87e09c8
@ -32,6 +32,7 @@ version 2.2:
|
||||
- Support DNx444
|
||||
- libx265 encoder
|
||||
- dejudder filter
|
||||
- subfile protocol
|
||||
|
||||
|
||||
version 2.1:
|
||||
|
@ -951,6 +951,30 @@ this binary block are used as master key, the following 14 bytes are
|
||||
used as master salt.
|
||||
@end table
|
||||
|
||||
@section subfile
|
||||
|
||||
Virtually extract a segment of a file or another stream.
|
||||
The underlying stream must be seekable.
|
||||
|
||||
Accepted options:
|
||||
@table @option
|
||||
@item start
|
||||
Start offset of the extracted segment, in bytes.
|
||||
@item end
|
||||
End offset of the extracted segment, in bytes.
|
||||
@end table
|
||||
|
||||
Examples:
|
||||
|
||||
Extract a chapter from a DVD VOB file (start and end sectors obtained
|
||||
externally and multiplied by 2048):
|
||||
@example
|
||||
subfile,,start,153391104,end,268142592,,:/media/dvd/VIDEO_TS/VTS_08_1.VOB
|
||||
@end example
|
||||
|
||||
Play an AVI file directly from a TAR archive:
|
||||
subfile,,start,183241728,end,366490624,,:archive.tar
|
||||
|
||||
@section tcp
|
||||
|
||||
Transmission Control Protocol.
|
||||
|
@ -464,6 +464,7 @@ OBJS-$(CONFIG_RTMPTS_PROTOCOL) += rtmpproto.o rtmppkt.o
|
||||
OBJS-$(CONFIG_RTP_PROTOCOL) += rtpproto.o
|
||||
OBJS-$(CONFIG_SCTP_PROTOCOL) += sctp.o
|
||||
OBJS-$(CONFIG_SRTP_PROTOCOL) += srtpproto.o srtp.o
|
||||
OBJS-$(CONFIG_SUBFILE_PROTOCOL) += subfile.o
|
||||
OBJS-$(CONFIG_TCP_PROTOCOL) += tcp.o
|
||||
OBJS-$(CONFIG_TLS_PROTOCOL) += tls.o
|
||||
OBJS-$(CONFIG_UDP_PROTOCOL) += udp.o
|
||||
|
@ -338,6 +338,7 @@ void av_register_all(void)
|
||||
REGISTER_PROTOCOL(RTP, rtp);
|
||||
REGISTER_PROTOCOL(SCTP, sctp);
|
||||
REGISTER_PROTOCOL(SRTP, srtp);
|
||||
REGISTER_PROTOCOL(SUBFILE, subfile);
|
||||
REGISTER_PROTOCOL(TCP, tcp);
|
||||
REGISTER_PROTOCOL(TLS, tls);
|
||||
REGISTER_PROTOCOL(UDP, udp);
|
||||
|
147
libavformat/subfile.c
Normal file
147
libavformat/subfile.c
Normal file
@ -0,0 +1,147 @@
|
||||
/*
|
||||
* Copyright (c) 2014 Nicolas George
|
||||
*
|
||||
* 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/avassert.h"
|
||||
#include "libavutil/avstring.h"
|
||||
#include "libavutil/opt.h"
|
||||
#include "avformat.h"
|
||||
#include "url.h"
|
||||
|
||||
typedef struct SubfileContext {
|
||||
const AVClass *class;
|
||||
URLContext *h;
|
||||
int64_t start;
|
||||
int64_t end;
|
||||
int64_t pos;
|
||||
} SubfileContext;
|
||||
|
||||
#define OFFSET(field) offsetof(SubfileContext, field)
|
||||
#define D AV_OPT_FLAG_DECODING_PARAM
|
||||
|
||||
static const AVOption subfile_options[] = {
|
||||
{ "start", "start offset", OFFSET(start), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, D },
|
||||
{ "end", "end offset", OFFSET(end), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, D },
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
#undef OFFSET
|
||||
#undef D
|
||||
|
||||
static const AVClass subfile_class = {
|
||||
.class_name = "subfile",
|
||||
.item_name = av_default_item_name,
|
||||
.option = subfile_options,
|
||||
.version = LIBAVUTIL_VERSION_INT,
|
||||
};
|
||||
|
||||
static int slave_seek(URLContext *h)
|
||||
{
|
||||
SubfileContext *c = h->priv_data;
|
||||
int64_t ret;
|
||||
|
||||
if ((ret = ffurl_seek(c->h, c->pos, SEEK_SET)) != c->pos) {
|
||||
if (ret >= 0)
|
||||
ret = AVERROR_BUG;
|
||||
av_log(h, AV_LOG_ERROR, "Impossible to seek in file: %s\n",
|
||||
av_err2str(ret));
|
||||
return ret;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int subfile_open(URLContext *h, const char *filename, int flags,
|
||||
AVDictionary **options)
|
||||
{
|
||||
SubfileContext *c = h->priv_data;
|
||||
int ret;
|
||||
|
||||
if (c->end <= c->start) {
|
||||
av_log(h, AV_LOG_ERROR, "end before start\n");
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
av_strstart(filename, "subfile:", &filename);
|
||||
ret = ffurl_open(&c->h, filename, flags, &h->interrupt_callback, options);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
c->pos = c->start;
|
||||
if ((ret = slave_seek(h)) < 0) {
|
||||
ffurl_close(c->h);
|
||||
return ret;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int subfile_close(URLContext *h)
|
||||
{
|
||||
SubfileContext *c = h->priv_data;
|
||||
return ffurl_close(c->h);
|
||||
}
|
||||
|
||||
static int subfile_read(URLContext *h, unsigned char *buf, int size)
|
||||
{
|
||||
SubfileContext *c = h->priv_data;
|
||||
int64_t rest = c->end - c->pos;
|
||||
int ret;
|
||||
|
||||
if (rest <= 0)
|
||||
return 0;
|
||||
size = FFMIN(size, rest);
|
||||
ret = ffurl_read(c->h, buf, size);
|
||||
if (ret >= 0)
|
||||
c->pos += ret;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int64_t subfile_seek(URLContext *h, int64_t pos, int whence)
|
||||
{
|
||||
SubfileContext *c = h->priv_data;
|
||||
int64_t new_pos = -1;
|
||||
int ret;
|
||||
|
||||
if (whence == AVSEEK_SIZE)
|
||||
return c->end - c->start;
|
||||
switch (whence) {
|
||||
case SEEK_SET:
|
||||
new_pos = c->start + pos;
|
||||
break;
|
||||
case SEEK_CUR:
|
||||
new_pos += pos;
|
||||
break;
|
||||
case SEEK_END:
|
||||
new_pos = c->end + c->pos;
|
||||
break;
|
||||
}
|
||||
if (new_pos < c->start)
|
||||
return AVERROR(EINVAL);
|
||||
c->pos = new_pos;
|
||||
if ((ret = slave_seek(h)) < 0)
|
||||
return ret;
|
||||
return c->pos - c->start;
|
||||
}
|
||||
|
||||
URLProtocol ff_subfile_protocol = {
|
||||
.name = "subfile",
|
||||
.url_open2 = subfile_open,
|
||||
.url_read = subfile_read,
|
||||
.url_seek = subfile_seek,
|
||||
.url_close = subfile_close,
|
||||
.priv_data_size = sizeof(SubfileContext),
|
||||
.priv_data_class = &subfile_class,
|
||||
};
|
@ -30,8 +30,8 @@
|
||||
#include "libavutil/version.h"
|
||||
|
||||
#define LIBAVFORMAT_VERSION_MAJOR 55
|
||||
#define LIBAVFORMAT_VERSION_MINOR 33
|
||||
#define LIBAVFORMAT_VERSION_MICRO 101
|
||||
#define LIBAVFORMAT_VERSION_MINOR 34
|
||||
#define LIBAVFORMAT_VERSION_MICRO 100
|
||||
|
||||
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
|
||||
LIBAVFORMAT_VERSION_MINOR, \
|
||||
|
Loading…
Reference in New Issue
Block a user