X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Ffile.c;h=2837e9f150e05db0df5f1567ca46859be60e5835;hb=929ec39ec4497827f7530f2aaa31646ef35462ee;hp=3c3f42f4dfc3db7a6c3df3d6dc676fb986b5f593;hpb=defb0009cff57d66fe952915917864cc5b3a417f;p=ffmpeg diff --git a/libavformat/file.c b/libavformat/file.c index 3c3f42f4dfc..2837e9f150e 100644 --- a/libavformat/file.c +++ b/libavformat/file.c @@ -1,107 +1,158 @@ /* - * Buffered file io for ffmpeg system + * buffered file I/O * Copyright (c) 2001 Fabrice Bellard * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav 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, + * Libav 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 + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/avstring.h" +#include "libavutil/internal.h" +#include "libavutil/opt.h" #include "avformat.h" #include -#if HAVE_SETMODE +#if HAVE_IO_H #include #endif +#if HAVE_UNISTD_H #include +#endif #include #include #include "os_support.h" +#include "url.h" /* standard file protocol */ +typedef struct FileContext { + const AVClass *class; + int fd; + int trunc; +} FileContext; + +static const AVOption file_options[] = { + { "truncate", "Truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM }, + { NULL } +}; + +static const AVClass file_class = { + .class_name = "file", + .item_name = av_default_item_name, + .option = file_options, + .version = LIBAVUTIL_VERSION_INT, +}; + static int file_read(URLContext *h, unsigned char *buf, int size) { - int fd = (intptr_t) h->priv_data; - return read(fd, buf, size); + FileContext *c = h->priv_data; + return read(c->fd, buf, size); } static int file_write(URLContext *h, const unsigned char *buf, int size) { - int fd = (intptr_t) h->priv_data; - return write(fd, buf, size); + FileContext *c = h->priv_data; + return write(c->fd, buf, size); } static int file_get_handle(URLContext *h) { - return (intptr_t) h->priv_data; + FileContext *c = h->priv_data; + return c->fd; +} + +static int file_check(URLContext *h, int mask) +{ + struct stat st; + int ret = stat(h->filename, &st); + if (ret < 0) + return AVERROR(errno); + + ret |= st.st_mode&S_IRUSR ? mask&AVIO_FLAG_READ : 0; + ret |= st.st_mode&S_IWUSR ? mask&AVIO_FLAG_WRITE : 0; + + return ret; } #if CONFIG_FILE_PROTOCOL static int file_open(URLContext *h, const char *filename, int flags) { + FileContext *c = h->priv_data; 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; + if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) { + access = O_CREAT | O_RDWR; + if (c->trunc) + access |= O_TRUNC; + } else if (flags & AVIO_FLAG_WRITE) { + access = O_CREAT | O_WRONLY; + if (c->trunc) + access |= O_TRUNC; } else { access = O_RDONLY; } #ifdef O_BINARY access |= O_BINARY; #endif - fd = open(filename, access, 0666); + fd = avpriv_open(filename, access, 0666); if (fd == -1) return AVERROR(errno); - h->priv_data = (void *) (intptr_t) fd; + c->fd = fd; return 0; } /* XXX: use llseek */ static int64_t file_seek(URLContext *h, int64_t pos, int whence) { - int fd = (intptr_t) h->priv_data; + FileContext *c = h->priv_data; + int64_t ret; + if (whence == AVSEEK_SIZE) { struct stat st; - int ret = fstat(fd, &st); + + ret = fstat(c->fd, &st); return ret < 0 ? AVERROR(errno) : st.st_size; } - return lseek(fd, pos, whence); + + ret = lseek(c->fd, pos, whence); + + return ret < 0 ? AVERROR(errno) : ret; } static int file_close(URLContext *h) { - int fd = (intptr_t) h->priv_data; - return close(fd); + FileContext *c = h->priv_data; + return close(c->fd); } -URLProtocol file_protocol = { - "file", - file_open, - file_read, - file_write, - file_seek, - file_close, +URLProtocol ff_file_protocol = { + .name = "file", + .url_open = file_open, + .url_read = file_read, + .url_write = file_write, + .url_seek = file_seek, + .url_close = file_close, .url_get_file_handle = file_get_handle, + .url_check = file_check, + .priv_data_size = sizeof(FileContext), + .priv_data_class = &file_class, }; #endif /* CONFIG_FILE_PROTOCOL */ @@ -110,13 +161,14 @@ URLProtocol file_protocol = { static int pipe_open(URLContext *h, const char *filename, int flags) { + FileContext *c = h->priv_data; 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) { + if (flags & AVIO_FLAG_WRITE) { fd = 1; } else { fd = 0; @@ -125,17 +177,19 @@ static int pipe_open(URLContext *h, const char *filename, int flags) #if HAVE_SETMODE setmode(fd, O_BINARY); #endif - h->priv_data = (void *) (intptr_t) fd; + c->fd = fd; h->is_streamed = 1; return 0; } -URLProtocol pipe_protocol = { - "pipe", - pipe_open, - file_read, - file_write, +URLProtocol ff_pipe_protocol = { + .name = "pipe", + .url_open = pipe_open, + .url_read = file_read, + .url_write = file_write, .url_get_file_handle = file_get_handle, + .url_check = file_check, + .priv_data_size = sizeof(FileContext), }; #endif /* CONFIG_PIPE_PROTOCOL */