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rewrite statefile code for audio devices

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In the words of the original author, it was 'crappy'.  I tend to
agree :)

The code has also been broken for at least the past few months,
and nobody bothered fixing it

The previous format it was overly complex: 5 lines to describe
each device.  The new format is one-line per-device:

audio_device_state:%d:%s

%d - 0 for disabled, any integer for enabled
%s - name of the device as specified in the config file,
whitespace and all

Incompatibilities:

* Output names are now _required_ to be unique.

This is required because the new format relies solely on the
name of the audio device.

Relying on the device IDs internal to MPD was a bad idea
anyways since the user usually has none or very little idea
how they're generated, and adding a new device or removing
one from a config would throw things off completely.

This is also just a Good Idea(TM) because it makes things
less confusing to users when they see it in their clients.

* Output states are not preserved from the previous format.

Not a big deal, since the previous code was never officially
released.  Also, it's been broken for months now, so I doubt
anybody would notice :)

git-svn-id: https://svn.musicpd.org/mpd/trunk@3928 09075e82-0dd4-0310-85a5-a0d7c8717e4f
This commit is contained in:
Eric Wong 2006-03-18 03:58:31 +00:00
parent 6dadabea21
commit a25acbc94f
3 changed files with 95 additions and 112 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

201
src/audio.c
View File

@ -34,18 +34,10 @@
#include <errno.h>
#include <unistd.h>
/* crappy code by qball */
#define AUDIO_STATE_FILE_DEVICE_START "audio_device_start"
#define AUDIO_STATE_FILE_DEVICE_ID "audio_device_id: "
#define AUDIO_STATE_FILE_DEVICE_ENABLED "audio_device_enabled: "
#define AUDIO_STATE_FILE_DEVICE_NAME "audio_device_name: "
#define AUDIO_STATE_FILE_DEVICE_END "audio_device_end"
#define AUDIO_DEVICE_STATE "audio_device_state:"
#define AUDIO_DEVICE_STATE_LEN 19 /* strlen(AUDIO_DEVICE_STATE) */
#define AUDIO_BUFFER_SIZE 2*MAXPATHLEN
/* /crappy code */
static void saveAudioDevicesState();
static AudioFormat audio_format;
@ -104,6 +96,9 @@ void initAudioDriver() {
param = getNextConfigParam(CONF_AUDIO_OUTPUT, param);
do {
AudioOutput *output;
int j;
if(audioOutputArraySize == AUDIO_MAX_DEVICES) {
ERROR("only up to 255 audio output devices are "
"supported");
@ -114,14 +109,25 @@ void initAudioDriver() {
audioOutputArray = realloc(audioOutputArray,
audioOutputArraySize*sizeof(AudioOutput *));
audioOutputArray[i] = newAudioOutput(param);
if(!audioOutputArray[i] && param) {
output = newAudioOutput(param);
if(!output && param) {
ERROR("problems configuring output device defined at "
"line %i\n", param->line);
exit(EXIT_FAILURE);
}
/* require output names to be unique: */
for (j = i - 1; j >= 0; --j) {
if ( !strcmp( output->name,
audioOutputArray[j]->name) ) {
ERROR("output devices with identical "
"names: %s\n",
output->name);
exit(EXIT_FAILURE);
}
}
audioOutputArray[i] = output;
} while((param = getNextConfigParam(CONF_AUDIO_OUTPUT, param)));
}
@ -221,6 +227,7 @@ void finishAudioConfig() {
void finishAudioDriver() {
int i;
saveAudioDevicesState();
for(i = 0; i < audioOutputArraySize; i++) {
finishAudioOutput(audioOutputArray[i]);
}
@ -415,115 +422,97 @@ void printAudioDevices(FILE * fp) {
}
}
/* more qball crappy code */
static char * getStateFile() {
ConfigParam * param = parseConfigFilePath(CONF_STATE_FILE, 0);
if(!param) return NULL;
return param->value;
}
void saveAudioDevicesState() {
static void saveAudioDevicesState() {
char *stateFile;
FILE *fp;
int i;
char * stateFile = getStateFile();
if(stateFile) {
FILE * fp;
while(!(fp = fopen(stateFile,"a")) && errno==EINTR);
if(!fp) {
ERROR("problems opening state file \"%s\" for "
"writing: %s\n", stateFile,
strerror(errno));
return;
if (!(stateFile = getStateFile()))
return;
while(!(fp = fopen(stateFile,"a")) && errno==EINTR);
if(!fp) {
ERROR("problems opening state file \"%s\" for "
"writing: %s\n", stateFile, strerror(errno));
return;
}
assert(audioOutputArraySize != 0);
for (i = audioOutputArraySize - 1; i >= 0; --i) {
myfprintf(fp, AUDIO_DEVICE_STATE "%d:%s\n",
(int)pdAudioDevicesEnabled[i],
audioOutputArray[i]->name);
}
while(fclose(fp) && errno==EINTR);
}
static void parse_audio_device_state(FILE *fp)
{
char buffer[AUDIO_BUFFER_SIZE];
int i;
assert(audioOutputArraySize != 0);
while (myFgets(buffer,AUDIO_BUFFER_SIZE,fp)) {
char *c, *name;
if (strncmp(buffer,AUDIO_DEVICE_STATE,AUDIO_DEVICE_STATE_LEN))
continue;
c = strchr(buffer,':');
if (!c || !(++c))
goto errline;
name = strchr(c,':');
if (!name || !(++name))
goto errline;
for (i = audioOutputArraySize - 1; i >= 0; --i) {
if (!strcmp(name, audioOutputArray[i]->name)) {
pdAudioDevicesEnabled[i] = atoi(c);
break;
}
}
for(i = 0; i < audioOutputArraySize; i++) {
myfprintf(fp, "%s\n", AUDIO_STATE_FILE_DEVICE_START);
myfprintf(fp, "%s%i\n", AUDIO_STATE_FILE_DEVICE_ID, i);
myfprintf(fp, "%s%s\n", AUDIO_STATE_FILE_DEVICE_NAME, audioOutputArray[i]->name);
myfprintf(fp, "%s%i\n", AUDIO_STATE_FILE_DEVICE_ENABLED,(int)pdAudioDevicesEnabled[i]);
myfprintf(fp, "%s\n", AUDIO_STATE_FILE_DEVICE_END);
}
while(fclose(fp) && errno==EINTR);
continue;
errline:
/* nonfatal */
ERROR("invalid line in state_file: %s\n", buffer);
}
}
void readAudioDevicesState() {
char * stateFile = getStateFile();
char *stateFile;
FILE *fp;
struct stat st;
if(stateFile) {
char buffer[AUDIO_BUFFER_SIZE];
if(stat(stateFile,&st)<0) {
DEBUG("failed to stat state file\n");
return;
}
if(!S_ISREG(st.st_mode)) {
ERROR("state file \"%s\" is not a regular "
"file\n",stateFile);
exit(EXIT_FAILURE);
}
fp = fopen(stateFile,"r");
if(!fp) {
ERROR("problems opening state file \"%s\" for "
"reading: %s\n", stateFile,
strerror(errno));
exit(EXIT_FAILURE);
}
while(myFgets(buffer,AUDIO_BUFFER_SIZE,fp)) {
if(strncmp(buffer,AUDIO_STATE_FILE_DEVICE_START, strlen(AUDIO_STATE_FILE_DEVICE_START))==0) {
char *name = NULL;
int id = -1;
int enabled = 1;
if(!myFgets(buffer,AUDIO_BUFFER_SIZE,fp)) {
ERROR("error parsing state file \"%s\"\n", stateFile);
exit(EXIT_FAILURE);
}
while(strcmp(buffer,AUDIO_STATE_FILE_DEVICE_END)) {
if(strncmp(buffer,AUDIO_STATE_FILE_DEVICE_ID, strlen(AUDIO_STATE_FILE_DEVICE_ID)) == 0 ) {
if(strlen(buffer) > strlen(AUDIO_STATE_FILE_DEVICE_ID))
{
id = atoi(&buffer[strlen(AUDIO_STATE_FILE_DEVICE_ID)]);
}
}
if(strncmp(buffer,AUDIO_STATE_FILE_DEVICE_ENABLED, strlen(AUDIO_STATE_FILE_DEVICE_ENABLED)) == 0 ) {
if(strlen(buffer) > strlen(AUDIO_STATE_FILE_DEVICE_ENABLED))
{
enabled = atoi(&buffer[strlen(AUDIO_STATE_FILE_DEVICE_ENABLED)]);
}
}
if(!myFgets(buffer,AUDIO_BUFFER_SIZE,fp)) {
ERROR("error parsing state file \"%s\"\n", stateFile);
exit(EXIT_FAILURE);
}
}
if(id != -1)
{
/* search for same name here, can we trust id? */
if(id < audioOutputArraySize)
{
pdAudioDevicesEnabled[id] = enabled;
}
}
if(name != NULL)
{
free(name);
}
}
}
fclose(fp);
if (!(stateFile = getStateFile()))
return;
if(stat(stateFile,&st)<0) {
DEBUG("failed to stat state file\n");
return;
}
if(!S_ISREG(st.st_mode)) {
ERROR("state file \"%s\" is not a regular file\n",
stateFile);
exit(EXIT_FAILURE);
}
fp = fopen(stateFile,"r");
if(!fp) {
ERROR("problems opening state file \"%s\" for "
"reading: %s\n", stateFile,
strerror(errno));
exit(EXIT_FAILURE);
}
parse_audio_device_state(fp);
fclose(fp);
}

2
src/audio.h
View File

@ -75,8 +75,6 @@ int disableAudioDevice(FILE * fp, int device);
void printAudioDevices(FILE * fp);
/* qball's crappy code */
void readAudioDevicesState();
void saveAudioDevicesState();
#endif

4
src/main.c
View File

@ -300,7 +300,6 @@ void startMainProcess() {
if(pid>0) {
initInputStream();
initReplayGainState();
/* qball crappy code */
readAudioDevicesState();
/* free stuff we don't need */
@ -317,9 +316,6 @@ void startMainProcess() {
finishAudioConfig();
finishAudioDriver();
/* qball crappy code */
saveAudioDevicesState();
finishPaths();
kill(mainPid, SIGTERM);