Logging with libvlc

[Moriquendi]

Hi,

I'm developing a Qt application which provides users to watch up to 4 different videos simultaneously. I'm using libvlc api for playing media. Anyway, what I'd like to do is to print vlc logs for each specific player. Same as Tools->Messages and you can view the whole log in the console. So far I can print all the messages using;

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libvlc_log_set(instance->core(), log_cb, NULL);

and in my callback function:

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void log_cb(void *logdata, int level, const libvlc_log_t *ctx, const char *fmt, va_list args) { char message[1024 * 16]; memset(message, 0, sizeof(char) * 1024 * 16); vsnprintf(message, 1024 * 16, fmt, args); int messageLength = strlen(message); int messageBufferLength = utf8_to_wchar_len(message, messageLength, 0); wchar_t *messageBuffer = static_cast<wchar_t *>(calloc(messageBufferLength + 1, sizeof(wchar_t))); utf8_to_wchar(message, messageLength, messageBuffer, messageBufferLength, 0); qDebug()<<QString::fromWCharArray(messageBuffer); free(messageBuffer); }

The problem is; I can not separate 4 different media player logs. In other words, I dont know which log message belongs to which media player. For instance;

"picture might be displayed late (missing 5 ms)" message may belong to Media Player 1 or Media Player 2. How can I filter those messages further? I've used libvlc_log_get_object function as;

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const char *name = ""; const char *header = ""; uintptr_t id = 0; libvlc_log_get_object(ctx,&name,&header,&id); qDebug() << "NAME:"<<name<<",ID:"<<id;

and the result is something like;

NAME: video output,ID: 75860772

But I couldn't relate "ID" with anything since for each different module, it may vary.

Any help would be appreciated.

P.S: I know I can create each player using different VLC instances, and I can define 4 different callback functions and the problem can be solved. But I'd like to use only 1 VLC instance for simplicity and some other concerns.

Cheers.

[Rémi Denis-Courmont]

Logs are per instance - also in VLC itself.