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pls_handler.c
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pls_handler.c
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/*
* Audio Scheduler - An audio clip scheduler for use in radio broadcasting
* Playlist data handler
*
* Copyright (C) 2016 Nick Kossifidis <[email protected]>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "scheduler.h"
#include "utils.h"
#include <stdlib.h> /* For malloc/realloc/free */
#include <string.h> /* For strncmp() and strchr() */
#include <stdio.h> /* For FILE handling */
#include <limits.h> /* For PATH_MAX */
enum pls_type {
TYPE_PLS = 1,
TYPE_M3U = 2,
};
/*********\
* HELPERS *
\*********/
static int
pls_check_type(char* filepath)
{
int filepath_len = 0;
int type = -1;
char* ext = NULL;
filepath_len = strnlen(filepath, PATH_MAX);
ext = filepath + filepath_len + 1 - 4;
if(!strncmp(ext, "pls", 4))
type = TYPE_PLS;
else if(!strncmp(ext, "m3u", 4))
type = TYPE_M3U;
else
utils_err(PLS, "Unknown file type: %s\n", filepath);
return type;
}
static void
pls_files_cleanup_internal(char** files, int num_files)
{
if(!files)
return;
while(num_files > 0) {
free(files[num_files - 1]);
num_files--;
}
free(files);
}
static int
pls_add_file(char* filepath, char ***files, int *num_files)
{
int len = 0;
int ret = 0;
char* file = NULL;
char** temp = NULL;
utils_trim_string(filepath);
/* Is it a file that we can read ?
* Note that M3Us may also contain
* folders, this is not supported here
* for now */
if(!utils_is_readable_file(filepath))
goto cleanup;
/* Get size of the filepath string, including
* null terminator */
len = strnlen(filepath, PATH_MAX);
len++;
file = (char*) malloc(len);
if(!file) {
utils_err(PLS, "Could not allocate filename on files array\n");
ret = -1;
goto cleanup;
}
memcpy(file, filepath, len);
temp = realloc(*files, ((*num_files) + 1) * sizeof(char*));
if(!temp) {
utils_err(PLS, "Could not expand files array\n");
free(file);
ret = -1;
goto cleanup;
}
*files = temp;
(*files)[(*num_files)] = file;
utils_dbg(PLS, "Added file: %s\n", (*files)[(*num_files)]);
(*num_files)++;
cleanup:
if(ret < 0) {
pls_files_cleanup_internal(*files, (*num_files));
(*num_files) = 0;
*files = NULL;
}
return ret;
}
static inline void
pls_file_swap(char** items, int x, int y)
{
char* tmp = items[x];
items[x] = items[y];
items[y] = tmp;
}
/**********\
* SHUFFLER *
\**********/
int
pls_shuffle(struct playlist* pls)
{
unsigned int next_file_idx = 0;
int target_slot = 0;
/* Shuffle playlist using Durstenfeld's algorithm:
* Pick a random number from the remaining ones,
* and stack it up the end of the array. */
for (target_slot = pls->num_items-1; target_slot > 0; target_slot--) {
next_file_idx = utils_get_random_uint() % target_slot;
pls_file_swap(pls->items, next_file_idx, target_slot);
}
if(utils_is_debug_enabled(SHUF)) {
utils_dbg(SHUF, "--== Shuffled list ==--\n");
int i = 0;
for(i = 0; i < pls->num_items; i++)
utils_dbg(SHUF|SKIP, "%i %s\n", i, pls->items[i]);
}
return 0;
}
/**************\
* ENTRY POINTS *
\**************/
void
pls_files_cleanup(struct playlist* pls)
{
pls_files_cleanup_internal(pls->items, pls->num_items);
}
int
pls_process(struct playlist* pls)
{
char line[PATH_MAX] = {0};
char* delim = NULL;
FILE *pls_file = NULL;
int type = 0;
int ret = 0;
/* Sanity checks */
if(pls->filepath == NULL) {
utils_err(PLS, "Called with null argument\n");
ret = -1;
goto cleanup;
}
ret = pls_check_type(pls->filepath);
if(ret < 0)
goto cleanup;
type = ret;
if(!utils_is_readable_file(pls->filepath)) {
ret = -1;
goto cleanup;
}
/* Store mtime for later checks */
pls->last_mtime = utils_get_mtime(pls->filepath);
if(!pls->last_mtime) {
ret = -1;
goto cleanup;
}
/* Open playlist file and start parsing its contents */
pls_file = fopen(pls->filepath, "rb");
if (pls_file == NULL) {
utils_perr(PLS, "Couldn't open file %s", pls->filepath);
ret = -1;
goto cleanup;
}
switch(type) {
case TYPE_PLS:
/* Grab the first line and see if it's the expected header */
if(fgets(line, PATH_MAX, pls_file) != NULL) {
utils_trim_string(line);
if(strncmp(line, "[playlist]", 11)) {
utils_err(PLS, "Invalid header on %s: %s\n",
pls->filepath, line);
ret = -1;
goto cleanup;
}
}
while(fgets(line, PATH_MAX, pls_file) != NULL) {
/* Not a file */
if(strncmp(line, "File", 4))
continue;
delim = strchr(line, '=');
delim++;
ret = pls_add_file(delim, &pls->items, &pls->num_items);
if(ret < 0) {
ret = -1;
goto cleanup;
}
}
break;
case TYPE_M3U:
while(fgets(line, PATH_MAX, pls_file) != NULL) {
/* EXTINF etc */
if(line[0] == '#')
continue;
delim = strchr(line, '=');
delim++;
ret = pls_add_file(line, &pls->items, &pls->num_items);
if(ret < 0) {
ret = -1;
goto cleanup;
}
}
break;
default:
/* Shouldn't reach this */
ret = -1;
goto cleanup;
}
/* Shuffle contents if needed */
if(pls->shuffle) {
ret = pls_shuffle(pls);
if(ret < 0) {
utils_err(PLS, "Shuffling failed for %s\n", pls->filepath);
goto cleanup;
}
}
utils_dbg(PLS, "Got %i files from %s\n", pls->num_items, pls->filepath);
cleanup:
if(pls_file)
fclose(pls_file);
if(ret < 0) {
if(pls->items)
pls_files_cleanup_internal(pls->items, pls->num_items);
pls->num_items = 0;
}
return ret;
}
int
pls_reload_if_needed(struct playlist* pls)
{
time_t mtime = utils_get_mtime(pls->filepath);
if(!mtime) {
utils_err(PLS, "Unable to check mtime for %s\n", pls->filepath);
return -1;
}
/* mtime didn't change, no need to reload */
if(mtime == pls->last_mtime)
return 0;
utils_info(PLS, "Got different mtime, reloading %s\n", pls->filepath);
/* Re-load playlist */
pls_files_cleanup(pls);
return pls_process(pls);
}