Merged revisions 328120 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.10

........
  r328120 | dvossel | 2011-07-13 17:09:34 -0500 (Wed, 13 Jul 2011) | 15 lines
  
  Preserve sample rate quality of wideband mixmonitor recordings.
  
  MixMonitor has the ability to record in any file format Asterisk supports,
  but the quality of wideband audio is not preserved.  This is because
  regardless of the sample rate the call is being recorded in, the audio
  is always downsampled to 8khz and then upsampled to whatever wideband
  format it is being written as.  This patch resolves this by requesting
  the audio from the audiohook in the signed linear format closest to the
  sample rate of the format we are writing.  This fix is only possible for
  Asterisk 1.10 because audio hooks in 1.8 are not capable of wideband
  audio.
  
  Review: https://reviewboard.asterisk.org/r/1314/
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@328121 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_mixmonitor.c

@@ -47,6 +47,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include "asterisk/channel.h"
 #include "asterisk/autochan.h"
 #include "asterisk/manager.h"
+#include "asterisk/mod_format.h"
 
 /*** DOCUMENTATION
 	<application name="MixMonitor" language="en_US">
@@ -225,6 +226,8 @@ struct mixmonitor_ds {
 	struct ast_filestream *fs_write;
 
 	struct ast_audiohook *audiohook;
+
+	unsigned int samp_rate;
 };
 
 /*!
@@ -346,6 +349,9 @@ static void mixmonitor_save_prep(struct mixmonitor *mixmonitor, char *filename,
 			if (!(*fs = ast_writefile(filename, ext, NULL, *oflags, 0, 0666))) {
 				ast_log(LOG_ERROR, "Cannot open %s.%s\n", filename, ext);
 				*errflag = 1;
+			} else {
+				struct ast_filestream *tmp = *fs;
+				mixmonitor->mixmonitor_ds->samp_rate = MAX(mixmonitor->mixmonitor_ds->samp_rate, ast_format_rate(&tmp->fmt->format));
 			}
 		}
 	}
@@ -363,13 +369,22 @@ static void *mixmonitor_thread(void *obj)
 	int errflag = 0;
 	struct ast_format format_slin;
 
-	ast_format_set(&format_slin, AST_FORMAT_SLINEAR, 0);
 	ast_verb(2, "Begin MixMonitor Recording %s\n", mixmonitor->name);
 
 	fs = &mixmonitor->mixmonitor_ds->fs;
 	fs_read = &mixmonitor->mixmonitor_ds->fs_read;
 	fs_write = &mixmonitor->mixmonitor_ds->fs_write;
 
+	ast_mutex_lock(&mixmonitor->mixmonitor_ds->lock);
+	mixmonitor_save_prep(mixmonitor, mixmonitor->filename, fs, &oflags, &errflag);
+	mixmonitor_save_prep(mixmonitor, mixmonitor->filename_read, fs_read, &oflags, &errflag);
+	mixmonitor_save_prep(mixmonitor, mixmonitor->filename_write, fs_write, &oflags, &errflag);
+
+	ast_format_set(&format_slin, ast_format_slin_by_rate(mixmonitor->mixmonitor_ds->samp_rate), 0);
+
+	ast_mutex_unlock(&mixmonitor->mixmonitor_ds->lock);
+
+
 	/* The audiohook must enter and exit the loop locked */
 	ast_audiohook_lock(&mixmonitor->audiohook);
 	while (mixmonitor->audiohook.status == AST_AUDIOHOOK_STATUS_RUNNING && !mixmonitor->mixmonitor_ds->fs_quit) {
@@ -393,9 +408,6 @@ static void *mixmonitor_thread(void *obj)
 
 		if (!ast_test_flag(mixmonitor, MUXFLAG_BRIDGED) || (mixmonitor->autochan->chan && ast_bridged_channel(mixmonitor->autochan->chan))) {
 			ast_mutex_lock(&mixmonitor->mixmonitor_ds->lock);
-			mixmonitor_save_prep(mixmonitor, mixmonitor->filename, fs, &oflags, &errflag);
-			mixmonitor_save_prep(mixmonitor, mixmonitor->filename_read, fs_read, &oflags, &errflag);
-			mixmonitor_save_prep(mixmonitor, mixmonitor->filename_write, fs_write, &oflags, &errflag);
 
 			/* Write out the frame(s) */
 			if ((*fs_read) && (fr_read)) {
@@ -484,6 +496,8 @@ static int setup_mixmonitor_ds(struct mixmonitor *mixmonitor, struct ast_channel
 		return -1;
 	}
 
+
+	mixmonitor_ds->samp_rate = 8000;
 	mixmonitor_ds->audiohook = &mixmonitor->audiohook;
 	datastore->data = mixmonitor_ds;