Wed Oct 28 11:45:41 2009

Asterisk developer's documentation


res_convert.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 2005, 2006, Digium, Inc.
00005  *
00006  * redice li <redice_li@yahoo.com>
00007  * Russell Bryant <russell@digium.com>
00008  *
00009  * See http://www.asterisk.org for more information about
00010  * the Asterisk project. Please do not directly contact
00011  * any of the maintainers of this project for assistance;
00012  * the project provides a web site, mailing lists and IRC
00013  * channels for your use.
00014  *
00015  * This program is free software, distributed under the terms of
00016  * the GNU General Public License Version 2. See the LICENSE file
00017  * at the top of the source tree.
00018  */
00019 
00020 /*! \file
00021  * 
00022  * \brief file format conversion CLI command using Asterisk formats and translators
00023  *
00024  * \author redice li <redice_li@yahoo.com>
00025  * \author Russell Bryant <russell@digium.com>
00026  *
00027  */ 
00028 
00029 #include "asterisk.h"
00030 
00031 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 196865 $")
00032 
00033 #include "asterisk/channel.h"
00034 #include "asterisk/module.h"
00035 #include "asterisk/cli.h"
00036 #include "asterisk/file.h"
00037 
00038 /*! \brief Split the filename to basename and extension */
00039 static int split_ext(char *filename, char **name, char **ext)
00040 {
00041    *name = *ext = filename;
00042    
00043    if ((*ext = strrchr(filename, '.'))) {
00044       **ext = '\0';
00045       (*ext)++;
00046    }
00047 
00048    if (ast_strlen_zero(*name) || ast_strlen_zero(*ext))
00049       return -1;
00050 
00051    return 0;
00052 }
00053 
00054 /*! 
00055  * \brief Convert a file from one format to another 
00056  * \param e CLI entry
00057  * \param cmd command number
00058  * \param a list of cli arguments
00059  * \retval CLI_SUCCESS on success.
00060  * \retval CLI_SHOWUSAGE or CLI_FAILURE on failure.
00061 */
00062 static char *handle_cli_file_convert(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00063 {
00064    char *ret = CLI_FAILURE;
00065    struct ast_filestream *fs_in = NULL, *fs_out = NULL;
00066    struct ast_frame *f;
00067    struct timeval start;
00068    int cost;
00069    char *file_in = NULL, *file_out = NULL;
00070    char *name_in, *ext_in, *name_out, *ext_out;
00071 
00072    switch (cmd) {
00073    case CLI_INIT:
00074       e->command = "file convert";
00075       e->usage =
00076          "Usage: file convert <file_in> <file_out>\n"
00077          "       Convert from file_in to file_out. If an absolute path\n"
00078          "       is not given, the default Asterisk sounds directory\n"
00079          "       will be used.\n\n"
00080          "       Example:\n"
00081          "           file convert tt-weasels.gsm tt-weasels.ulaw\n";
00082       return NULL;
00083    case CLI_GENERATE:
00084       return NULL;
00085    }
00086    
00087    /* ugly, can be removed when CLI entries have ast_module pointers */
00088    ast_module_ref(ast_module_info->self);
00089 
00090    if (a->argc != 4 || ast_strlen_zero(a->argv[2]) || ast_strlen_zero(a->argv[3])) {
00091       ret = CLI_SHOWUSAGE;
00092       goto fail_out; 
00093    }
00094 
00095    file_in = ast_strdupa(a->argv[2]);
00096    file_out = ast_strdupa(a->argv[3]);
00097 
00098    if (split_ext(file_in, &name_in, &ext_in)) {
00099       ast_cli(a->fd, "'%s' is an invalid filename!\n", a->argv[2]);
00100       goto fail_out;
00101    }
00102    if (!(fs_in = ast_readfile(name_in, ext_in, NULL, O_RDONLY, 0, 0))) {
00103       ast_cli(a->fd, "Unable to open input file: %s\n", a->argv[2]);
00104       goto fail_out;
00105    }
00106    
00107    if (split_ext(file_out, &name_out, &ext_out)) {
00108       ast_cli(a->fd, "'%s' is an invalid filename!\n", a->argv[3]);
00109       goto fail_out;
00110    }
00111    if (!(fs_out = ast_writefile(name_out, ext_out, NULL, O_CREAT|O_TRUNC|O_WRONLY, 0, AST_FILE_MODE))) {
00112       ast_cli(a->fd, "Unable to open output file: %s\n", a->argv[3]);
00113       goto fail_out;
00114    }
00115 
00116    start = ast_tvnow();
00117    
00118    while ((f = ast_readframe(fs_in))) {
00119       if (ast_writestream(fs_out, f)) {
00120          ast_frfree(f);
00121          ast_cli(a->fd, "Failed to convert %s.%s to %s.%s!\n", name_in, ext_in, name_out, ext_out);
00122          goto fail_out;
00123       }
00124       ast_frfree(f);
00125    }
00126 
00127    cost = ast_tvdiff_ms(ast_tvnow(), start);
00128    ast_cli(a->fd, "Converted %s.%s to %s.%s in %dms\n", name_in, ext_in, name_out, ext_out, cost);
00129    ret = CLI_SUCCESS;
00130 
00131 fail_out:
00132    if (fs_out) {
00133       ast_closestream(fs_out);
00134       if (ret != CLI_SUCCESS)
00135          ast_filedelete(name_out, ext_out);
00136    }
00137 
00138    if (fs_in) 
00139       ast_closestream(fs_in);
00140 
00141    ast_module_unref(ast_module_info->self);
00142 
00143    return ret;
00144 }
00145 
00146 static struct ast_cli_entry cli_convert[] = {
00147    AST_CLI_DEFINE(handle_cli_file_convert, "Convert audio file")
00148 };
00149 
00150 static int unload_module(void)
00151 {
00152    ast_cli_unregister_multiple(cli_convert, sizeof(cli_convert) / sizeof(struct ast_cli_entry));
00153    return 0;
00154 }
00155 
00156 static int load_module(void)
00157 {
00158    ast_cli_register_multiple(cli_convert, sizeof(cli_convert) / sizeof(struct ast_cli_entry));
00159    return AST_MODULE_LOAD_SUCCESS;
00160 }
00161 
00162 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "File format conversion CLI command");

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