PeerStreamer

/*

 * Buffered file io for ffmpeg system

 * Copyright (c) 2001 Fabrice Bellard

 *

 * 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/avstring.h"

#include "avformat.h"

#include <fcntl.h>

#if HAVE_SETMODE

#include <io.h>

#endif

#include <unistd.h>

#include <sys/stat.h>

#include <sys/time.h>

#include <stdlib.h>

#include "os_support.h"

/* standard file protocol */

static int file_open(URLContext *h, const char *filename, int flags)

{

    int access;

    int fd;

    av_strstart(filename, "file:", &filename);

    if (flags & URL_RDWR) {

        access = O_CREAT | O_TRUNC | O_RDWR;

    } else if (flags & URL_WRONLY) {

        access = O_CREAT | O_TRUNC | O_WRONLY;

    } else {

        access = O_RDONLY;

    }

#ifdef O_BINARY

    access |= O_BINARY;

#endif

    fd = open(filename, access, 0666);

    if (fd == -1)

        return AVERROR(ENOENT);

    h->priv_data = (void *) (intptr_t) fd;

    return 0;

}

static int file_read(URLContext *h, unsigned char *buf, int size)

{

    int fd = (intptr_t) h->priv_data;

    return read(fd, buf, size);

}

static int file_write(URLContext *h, unsigned char *buf, int size)

{

    int fd = (intptr_t) h->priv_data;

    return write(fd, buf, size);

}

/* XXX: use llseek */

static int64_t file_seek(URLContext *h, int64_t pos, int whence)

{

    int fd = (intptr_t) h->priv_data;

    if (whence == AVSEEK_SIZE) {

        struct stat st;

        int ret = fstat(fd, &st);

        return ret < 0 ? AVERROR(errno) : st.st_size;

    }

    return lseek(fd, pos, whence);

}

static int file_close(URLContext *h)

{

    int fd = (intptr_t) h->priv_data;

    return close(fd);

}

static int file_get_handle(URLContext *h)

{

    return (intptr_t) h->priv_data;

}

URLProtocol file_protocol = {

    "file",

    file_open,

    file_read,

    file_write,

    file_seek,

    file_close,

    .url_get_file_handle = file_get_handle,

};

/* pipe protocol */

static int pipe_open(URLContext *h, const char *filename, int flags)

{

    int fd;

    char *final;

    av_strstart(filename, "pipe:", &filename);

    fd = strtol(filename, &final, 10);

    if((filename == final) || *final ) {/* No digits found, or something like 10ab */

        if (flags & URL_WRONLY) {

            fd = 1;

        } else {

            fd = 0;

        }

    }

#if HAVE_SETMODE

    setmode(fd, O_BINARY);

#endif

    h->priv_data = (void *) (intptr_t) fd;

    h->is_streamed = 1;

    return 0;

}

URLProtocol pipe_protocol = {

    "pipe",

    pipe_open,

    file_read,

    file_write,

    .url_get_file_handle = file_get_handle,

};