MythMusic: add a av_log_callback to avfDecoder to catch any FFmpeg me…

…ssages
MythTV · Apr 17, 2013 · 1b0cd69 · 1b0cd69
1 parent 15674cf
commit 1b0cd69
Showing 1 changed file with 71 additions and 0 deletions.
diff --git a/mythplugins/mythmusic/mythmusic/avfdecoder.cpp b/mythplugins/mythmusic/mythmusic/avfdecoder.cpp
@@ -75,6 +75,73 @@ static int64_t SeekFunc(void *opaque, int64_t offset, int whence)
     return -1;
 }
 
+static void myth_av_log(void *ptr, int level, const char* fmt, va_list vl)
+{
+    if (VERBOSE_LEVEL_NONE)
+        return;
+
+    static QString full_line("");
+    static const int msg_len = 255;
+    static QMutex string_lock;
+    uint64_t   verbose_mask  = VB_GENERAL;
+    LogLevel_t verbose_level = LOG_DEBUG;
+
+    // determine mythtv debug level from av log level
+    switch (level)
+    {
+        case AV_LOG_PANIC:
+            verbose_level = LOG_EMERG;
+            break;
+        case AV_LOG_FATAL:
+            verbose_level = LOG_CRIT;
+            break;
+        case AV_LOG_ERROR:
+            verbose_level = LOG_ERR;
+            verbose_mask |= VB_LIBAV;
+            break;
+        case AV_LOG_DEBUG:
+        case AV_LOG_VERBOSE:
+        case AV_LOG_INFO:
+            verbose_level = LOG_DEBUG;
+            verbose_mask |= VB_LIBAV;
+            break;
+        case AV_LOG_WARNING:
+            verbose_mask |= VB_LIBAV;
+            break;
+        default:
+            return;
+    }
+
+    if (!VERBOSE_LEVEL_CHECK(verbose_mask, verbose_level))
+        return;
+
+    string_lock.lock();
+    if (full_line.isEmpty() && ptr) {
+        AVClass* avc = *(AVClass**)ptr;
+        full_line.sprintf("[%s @ %p] ", avc->item_name(ptr), avc);
+    }
+
+    char str[msg_len+1];
+    int bytes = vsnprintf(str, msg_len+1, fmt, vl);
+
+    // check for truncated messages and fix them
+    if (bytes > msg_len)
+    {
+        LOG(VB_GENERAL, LOG_WARNING,
+            QString("Libav log output truncated %1 of %2 bytes written")
+                .arg(msg_len).arg(bytes));
+        str[msg_len-1] = '\n';
+    }
+
+    full_line += QString(str);
+    if (full_line.endsWith("\n"))
+    {
+        LOG(verbose_mask, verbose_level, full_line.trimmed());
+        full_line.truncate(0);
+    }
+    string_lock.unlock();
+}
+
 avfDecoder::avfDecoder(const QString &file, DecoderFactory *d, QIODevice *i,
                        AudioOutput *o) :
     Decoder(d, i, o),
@@ -94,6 +161,10 @@ avfDecoder::avfDecoder(const QString &file, DecoderFactory *d, QIODevice *i,
 {
     setObjectName("avfDecoder");
     setFilename(file);
+
+    bool debug = VERBOSE_LEVEL_CHECK(VB_LIBAV, LOG_ANY);
+    av_log_set_level((debug) ? AV_LOG_DEBUG : AV_LOG_ERROR);
+    av_log_set_callback(myth_av_log);
 }
 
 avfDecoder::~avfDecoder(void)