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mpv/common/playlist_parser.c

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/*
* This file is part of MPlayer.
*
* MPlayer 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 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Warning: this is outdated, crappy code. It is used only for --playlist.
* New or cleaned up code should be added to demux_playlist.c instead.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <limits.h>
#include "talloc.h"
#include "asxparser.h"
#include "playlist.h"
#include "playlist_parser.h"
#include "stream/stream.h"
#include "demux/demux.h"
#include "common/msg.h"
#include "options/path.h"
#define BUF_STEP 1024
#define WHITES " \n\r\t"
typedef struct play_tree_parser {
struct stream *stream;
char *buffer,*iter,*line;
int buffer_size , buffer_end;
int keep;
struct playlist *pl;
} play_tree_parser_t;
static void
strstrip(char* str) {
char* i;
if (str==NULL)
return;
for(i = str ; i[0] != '\0' && strchr(WHITES,i[0]) != NULL; i++)
/* NOTHING */;
if(i[0] != '\0') {
memmove(str,i,strlen(i) + 1);
for(i = str + strlen(str) - 1 ; strchr(WHITES,i[0]) != NULL; i--)
/* NOTHING */;
i[1] = '\0';
} else
str[0] = '\0';
}
static char*
play_tree_parser_get_line(play_tree_parser_t* p) {
char *end,*line_end;
int r,resize = 0;
if(p->buffer == NULL) {
p->buffer = malloc(BUF_STEP);
p->buffer_size = BUF_STEP;
p->buffer[0] = 0;
p->iter = p->buffer;
}
if(p->stream->eof && (p->buffer_end == 0 || p->iter[0] == '\0'))
return NULL;
assert(p->buffer_end < p->buffer_size);
assert(!p->buffer[p->buffer_end]);
while(1) {
if(resize) {
char *tmp;
r = p->iter - p->buffer;
end = p->buffer + p->buffer_end;
if (p->buffer_size > INT_MAX - BUF_STEP)
break;
tmp = realloc(p->buffer, p->buffer_size + BUF_STEP);
if (!tmp)
break;
p->buffer = tmp;
p->iter = p->buffer + r;
p->buffer_size += BUF_STEP;
resize = 0;
}
if(p->buffer_size - p->buffer_end > 1 && ! p->stream->eof) {
r = stream_read(p->stream,p->buffer + p->buffer_end,p->buffer_size - p->buffer_end - 1);
if(r > 0) {
p->buffer_end += r;
assert(p->buffer_end < p->buffer_size);
p->buffer[p->buffer_end] = '\0';
while(strlen(p->buffer + p->buffer_end - r) != r)
p->buffer[p->buffer_end - r + strlen(p->buffer + p->buffer_end - r)] = '\n';
}
assert(!p->buffer[p->buffer_end]);
}
end = strchr(p->iter,'\n');
if(!end) {
if(p->stream->eof) {
end = p->buffer + p->buffer_end;
break;
}
resize = 1;
continue;
}
break;
}
line_end = (end > p->iter && *(end-1) == '\r') ? end-1 : end;
if(line_end - p->iter >= 0)
p->line = realloc(p->line, line_end - p->iter + 1);
else
return NULL;
if(line_end - p->iter > 0)
strncpy(p->line,p->iter,line_end - p->iter);
p->line[line_end - p->iter] = '\0';
if(end[0] != '\0')
end++;
if(!p->keep) {
if(end[0] != '\0') {
p->buffer_end -= end-p->iter;
memmove(p->buffer,end,p->buffer_end);
} else
p->buffer_end = 0;
p->buffer[p->buffer_end] = '\0';
p->iter = p->buffer;
} else
p->iter = end;
return p->line;
}
static void
play_tree_parser_reset(play_tree_parser_t* p) {
p->iter = p->buffer;
}
static void
play_tree_parser_stop_keeping(play_tree_parser_t* p) {
p->keep = 0;
if(p->iter && p->iter != p->buffer) {
p->buffer_end -= p->iter -p->buffer;
if(p->buffer_end)
memmove(p->buffer,p->iter,p->buffer_end);
p->buffer[p->buffer_end] = 0;
p->iter = p->buffer;
}
}
static bool parse_asx(play_tree_parser_t* p) {
int comments = 0,get_line = 1;
char* line = NULL;
mp_msg(MSGT_PLAYTREE,MSGL_V,"Trying asx...\n");
while(1) {
if(get_line) {
line = play_tree_parser_get_line(p);
if(!line)
return false;
strstrip(line);
if(line[0] == '\0')
continue;
}
if(!comments) {
if(line[0] != '<') {
mp_msg(MSGT_PLAYTREE,MSGL_DBG2,"First char isn't '<' but '%c'\n",line[0]);
mp_msg(MSGT_PLAYTREE,MSGL_DBG3,"Buffer = [%s]\n",p->buffer);
return false;
} else if(strncmp(line,"<!--",4) == 0) { // Comments
comments = 1;
line += 4;
if(line[0] != '\0' && strlen(line) > 0)
get_line = 0;
} else if(strncasecmp(line,"<ASX",4) == 0) // We got an asx element
break;
else // We don't get an asx
return false;
} else { // Comments
char* c;
c = strchr(line,'-');
if(c) {
if (strncmp(c,"--!>",4) == 0) { // End of comments
comments = 0;
line = c+4;
if(line[0] != '\0') // There is some more data on this line : keep it
get_line = 0;
} else {
line = c+1; // Jump the -
if(line[0] != '\0') // Some more data
get_line = 0;
else // End of line
get_line = 1;
}
} else // No - on this line (or rest of line) : get next one
get_line = 1;
}
}
mp_msg(MSGT_PLAYTREE,MSGL_V,"Detected asx format\n");
// We have an asx : load it in memory and parse
while((line = play_tree_parser_get_line(p)) != NULL)
/* NOTHING */;
mp_msg(MSGT_PLAYTREE,MSGL_DBG3,"Parsing asx file: [%s]\n",p->buffer);
return asx_parse(p->buffer,p->pl);
}
static bool parse_smil(play_tree_parser_t* p) {
int entrymode=0;
char* line,source[512],*pos,*s_start,*s_end,*src_line;
int is_rmsmil = 0;
unsigned int npkt, ttlpkt;
mp_msg(MSGT_PLAYTREE,MSGL_V,"Trying smil playlist...\n");
// Check if smil
while((line = play_tree_parser_get_line(p)) != NULL) {
strstrip(line);
if(line[0] == '\0') // Ignore empties
continue;
if (strncasecmp(line,"<?xml",5)==0) // smil in xml
continue;
if (strncasecmp(line,"<!DOCTYPE smil",13)==0) // smil in xml
continue;
if (strncasecmp(line,"<smil",5)==0 || strncasecmp(line,"<?wpl",5)==0 ||
strncasecmp(line,"(smil-document",14)==0)
break; // smil header found
else
return NULL; //line not smil exit
}
if (!line) return NULL;
mp_msg(MSGT_PLAYTREE,MSGL_V,"Detected smil playlist format\n");
play_tree_parser_stop_keeping(p);
if (strncasecmp(line,"(smil-document",14)==0) {
mp_msg(MSGT_PLAYTREE,MSGL_V,"Special smil-over-realrtsp playlist header\n");
is_rmsmil = 1;
if (sscanf(line, "(smil-document (ver 1.0)(npkt %u)(ttlpkt %u", &npkt, &ttlpkt) != 2) {
mp_msg(MSGT_PLAYTREE,MSGL_WARN,"smil-over-realrtsp: header parsing failure, assuming single packet.\n");
npkt = ttlpkt = 1;
}
if (ttlpkt == 0 || npkt > ttlpkt) {
mp_msg(MSGT_PLAYTREE,MSGL_WARN,"smil-over-realrtsp: bad packet counters (npkk = %u, ttlpkt = %u), assuming single packet.\n",
npkt, ttlpkt);
npkt = ttlpkt = 1;
}
}
//Get entries from smil
src_line = line;
line = NULL;
do {
strstrip(src_line);
free(line);
line = NULL;
/* If we're parsing smil over realrtsp and this is not the last packet and
* this is the last line in the packet (terminating with ") ) we must get
* the next line, strip the header, and concatenate it to the current line.
*/
if (is_rmsmil && npkt != ttlpkt && strstr(src_line,"\")")) {
char *payload;
line = strdup(src_line);
if(!(src_line = play_tree_parser_get_line(p))) {
mp_msg(MSGT_PLAYTREE,MSGL_WARN,"smil-over-realrtsp: can't get line from packet %u/%u.\n", npkt, ttlpkt);
break;
}
strstrip(src_line);
// Skip header, packet starts after "
if(!(payload = strchr(src_line,'\"'))) {
mp_msg(MSGT_PLAYTREE,MSGL_WARN,"smil-over-realrtsp: can't find start of packet, using complete line.\n");
payload = src_line;
} else
payload++;
// Skip ") at the end of the last line from the current packet
line[strlen(line)-2] = 0;
line = realloc(line, strlen(line)+strlen(payload)+1);
strcat (line, payload);
npkt++;
} else
line = strdup(src_line);
/* Unescape \" to " for smil-over-rtsp */
if (is_rmsmil && line[0] != '\0') {
int i, j;
for (i = 0; i < strlen(line); i++)
if (line[i] == '\\' && line[i+1] == '"')
for (j = i; line[j]; j++)
line[j] = line[j+1];
}
pos = line;
while (pos) {
if (!entrymode) { // all entries filled so far
while ((pos=strchr(pos, '<'))) {
if (strncasecmp(pos,"<video",6)==0 || strncasecmp(pos,"<audio",6)==0 || strncasecmp(pos,"<media",6)==0) {
entrymode=1;
break; // Got a valid tag, exit '<' search loop
}
pos++;
}
}
if (entrymode) { //Entry found but not yet filled
pos = strstr(pos,"src="); // Is source present on this line
if (pos != NULL) {
entrymode=0;
if (pos[4] != '"' && pos[4] != '\'') {
mp_msg(MSGT_PLAYTREE,MSGL_V,"Unknown delimiter %c in source line %s\n", pos[4], line);
break;
}
s_start=pos+5;
s_end=strchr(s_start,pos[4]);
if (s_end == NULL) {
mp_msg(MSGT_PLAYTREE,MSGL_V,"Error parsing this source line %s\n",line);
break;
}
if (s_end-s_start> 511) {
mp_msg(MSGT_PLAYTREE,MSGL_V,"Cannot store such a large source %s\n",line);
break;
}
strncpy(source,s_start,s_end-s_start);
source[(s_end-s_start)]='\0'; // Null terminate
playlist_add_file(p->pl, source);
pos = s_end;
}
}
}
} while((src_line = play_tree_parser_get_line(p)) != NULL);
free(line);
return true;
}
static bool parse_textplain(play_tree_parser_t* p) {
char* line;
mp_msg(MSGT_PLAYTREE,MSGL_V,"Trying plaintext playlist...\n");
play_tree_parser_stop_keeping(p);
while((line = play_tree_parser_get_line(p)) != NULL) {
strstrip(line);
if(line[0] == '\0' || line[0] == '#' || (line[0] == '/' && line[1] == '/'))
continue;
playlist_add_file(p->pl,line);
}
return true;
}
/**
* \brief decode the base64 used in nsc files
* \param in input string, 0-terminated
* \param buf output buffer, must point to memory suitable for realloc,
* will be NULL on failure.
* \return decoded length in bytes
*/
static int decode_nsc_base64(char *in, char **buf) {
int i, j, n;
if (in[0] != '0' || in[1] != '2')
goto err_out;
in += 2; // skip prefix
if (strlen(in) < 16) // error out if nothing to decode
goto err_out;
in += 12; // skip encoded string length
n = strlen(in) / 4;
*buf = realloc(*buf, n * 3);
for (i = 0; i < n; i++) {
uint8_t c[4];
for (j = 0; j < 4; j++) {
c[j] = in[4 * i + j];
if (c[j] >= '0' && c[j] <= '9') c[j] += 0 - '0';
else if (c[j] >= 'A' && c[j] <= 'Z') c[j] += 10 - 'A';
else if (c[j] >= 'a' && c[j] <= 'z') c[j] += 36 - 'a';
else if (c[j] == '{') c[j] = 62;
else if (c[j] == '}') c[j] = 63;
else {
mp_msg(MSGT_PLAYTREE, MSGL_ERR, "Invalid character %c (0x%02"PRIx8")\n", c[j], c[j]);
goto err_out;
}
}
(*buf)[3 * i] = (c[0] << 2) | (c[1] >> 4);
(*buf)[3 * i + 1] = (c[1] << 4) | (c[2] >> 2);
(*buf)[3 * i + 2] = (c[2] << 6) | c[3];
}
return 3 * n;
err_out:
free(*buf);
*buf = NULL;
return 0;
}
/**
* \brief "converts" utf16 to ascii by just discarding every second byte
* \param buf buffer to convert
* \param len lenght of buffer, must be > 0
*/
static void utf16_to_ascii(char *buf, int len) {
int i;
if (len <= 0) return;
for (i = 0; i < len / 2; i++)
buf[i] = buf[i * 2];
buf[i] = 0; // just in case
}
static bool parse_nsc(play_tree_parser_t* p) {
char *line, *addr = NULL, *url, *unicast_url = NULL;
int port = 0;
mp_msg(MSGT_PLAYTREE,MSGL_V,"Trying nsc playlist...\n");
while((line = play_tree_parser_get_line(p)) != NULL) {
strstrip(line);
if(!line[0]) // Ignore empties
continue;
if (strncasecmp(line,"[Address]", 9) == 0)
break; // nsc header found
else
return false;
}
mp_msg(MSGT_PLAYTREE,MSGL_V,"Detected nsc playlist format\n");
play_tree_parser_stop_keeping(p);
while ((line = play_tree_parser_get_line(p)) != NULL) {
strstrip(line);
if (!line[0])
continue;
if (strncasecmp(line, "Unicast URL=", 12) == 0) {
int len = decode_nsc_base64(&line[12], &unicast_url);
if (len <= 0)
mp_msg(MSGT_PLAYTREE, MSGL_WARN, "[nsc] Unsupported Unicast URL encoding\n");
else
utf16_to_ascii(unicast_url, len);
} else if (strncasecmp(line, "IP Address=", 11) == 0) {
int len = decode_nsc_base64(&line[11], &addr);
if (len <= 0)
mp_msg(MSGT_PLAYTREE, MSGL_WARN, "[nsc] Unsupported IP Address encoding\n");
else
utf16_to_ascii(addr, len);
} else if (strncasecmp(line, "IP Port=", 8) == 0) {
port = strtol(&line[8], NULL, 0);
}
}
bool success = false;
if (unicast_url)
url = strdup(unicast_url);
else if (addr && port) {
url = malloc(strlen(addr) + 7 + 20 + 1);
sprintf(url, "http://%s:%i", addr, port);
} else
goto err_out;
playlist_add_file(p->pl, url);
free(url);
success = true;
err_out:
free(addr);
free(unicast_url);
return success;
}
static struct playlist *do_parse(struct stream* stream, bool forced);
struct playlist *playlist_parse_file(const char *file, struct MPOpts *opts)
{
stream_t *stream = stream_open(file, opts);
if(!stream) {
mp_msg(MSGT_PLAYTREE,MSGL_ERR,
"Error while opening playlist file %s: %s\n",
file, strerror(errno));
return false;
}
mp_msg(MSGT_PLAYTREE, MSGL_V,
"Parsing playlist file %s...\n", file);
struct playlist *ret = do_parse(stream, true);
free_stream(stream);
if (ret)
playlist_add_base_path(ret, mp_dirname(file));
return ret;
}
typedef bool (*parser_fn)(play_tree_parser_t *);
static const parser_fn pl_parsers[] = {
parse_asx,
parse_smil,
parse_nsc,
parse_textplain
};
static struct playlist *do_parse(struct stream* stream, bool forced)
{
play_tree_parser_t p = {
.stream = stream,
.pl = talloc_zero(NULL, struct playlist),
.keep = 1,
};
bool success = false;
struct demuxer *pl_demux = demux_open(stream, "playlist", NULL, stream->opts);
if (pl_demux && pl_demux->playlist) {
playlist_transfer_entries(p.pl, pl_demux->playlist);
success = true;
}
free_demuxer(pl_demux);
if (!success && play_tree_parser_get_line(&p) != NULL) {
for (int n = 0; n < sizeof(pl_parsers) / sizeof(pl_parsers[0]); n++) {
play_tree_parser_reset(&p);
if (pl_parsers[n] == parse_textplain && !forced)
break;
if (pl_parsers[n](&p)) {
success = true;
break;
}
}
}
if(success)
mp_msg(MSGT_PLAYTREE,MSGL_V,"Playlist successfully parsed\n");
else {
mp_msg(MSGT_PLAYTREE,((forced==1)?MSGL_ERR:MSGL_V),"Error while parsing playlist\n");
talloc_free(p.pl);
p.pl = NULL;
}
if (p.pl && !p.pl->first)
mp_msg(MSGT_PLAYTREE,((forced==1)?MSGL_WARN:MSGL_V),"Warning: empty playlist\n");
return p.pl;
}
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