Utility main script

mp3preview.sh

@@ -0,0 +1,154 @@
+#!/bin/bash
+
+# Best settings like in mixcloud.com
+SETT_PART_COUNT=5
+SETT_PART_DURATION=5
+SETT_CROSSFADE=1
+SETT_FORMAT="mp3"
+
+# Get system utilites with full path
+UTIL_FFMPEG=`whereis ffmpeg | awk {'print $2'}`
+UTIL_CUT=`whereis cut | awk {'print $2'}`
+UTIL_ECHO=`whereis echo | awk {'print $2'}`
+UTIL_EXPR=`whereis expr | awk {'print $2'}`
+UTIL_RM=`whereis rm | awk {'print $2'}`
+UTIL_MV=`whereis mv | awk {'print $2'}`
+
+# Get current process ID
+UNIQ_STR="$$"
+
+# Input and output files
+INPUT_FILE="$1"
+OUTPUT_FILE="$2"
+
+# Temp dir, RAM disk is the best place
+TEMP_DIR="$3"
+
+# Set default temp dir if not set
+if [ "$TEMP_DIR" != "" ]; then
+	TEMP_DIR=${3%/}
+	
+else
+	TEMP_DIR="/tmp"
+fi
+
+# Check if temp dir is exists
+if [ ! -d "$TEMP_DIR" ]; then
+	$UTIL_ECHO " ✗ Temporary directory ($TEMP_DIR) is not available"
+	exit 1
+fi
+
+# Checks, if all system utilites are present
+if [ "$UTIL_FFMPEG" = "" ] || [ "$UTIL_CUT" = "" ] || [ "$UTIL_ECHO" = "" ] || [ "$UTIL_EXPR" = "" ] || [ "$UTIL_RM" = "" ] || [ "$UTIL_MV" = "" ]; then
+	$UTIL_ECHO " ✗ Some utility, what needed for work is not present in system"
+	exit 1
+fi
+
+# Check if input file is set
+if [ "$INPUT_FILE" = "" ]; then
+	$UTIL_ECHO " ✗ Please set source file name"
+	exit 1
+fi
+
+# Check if output file is set
+if [ "$OUTPUT_FILE" = "" ]; then
+	$UTIL_ECHO " ✗ Please set output file name"
+	exit 1
+fi
+
+# Check if input file is exist
+if [ ! -f "$INPUT_FILE" ]; then
+	$UTIL_ECHO " ✗ Source file is not exist"
+	exit 1
+fi
+
+# Perfomance check
+PROC_START=`date +%s`
+
+# Extract file length
+INPUT_LEN_STR=`$UTIL_FFMPEG -i $INPUT_FILE 2>&1 | awk '/Duration/ { print substr($2,0,length($2)-1) }' | $UTIL_CUT -d. -f1`
+if [ "$INPUT_LEN_STR" = "" ]; then
+	$UTIL_ECHO " ✗ Can't get file duration"
+	exit 1
+fi
+
+# Convert length to integer
+INPUT_LEN_HOURS=`$UTIL_ECHO $INPUT_LEN_STR | $UTIL_CUT -d: -f1`
+INPUT_LEN_MINUTES=`$UTIL_ECHO $INPUT_LEN_STR | $UTIL_CUT -d: -f2`
+INPUT_LEN_SECONDS=`$UTIL_ECHO $INPUT_LEN_STR | $UTIL_CUT -d: -f3`
+INPUT_LEN_HOURS=`$UTIL_EXPR $INPUT_LEN_HOURS + 0`
+INPUT_LEN_MINUTES=`$UTIL_EXPR $INPUT_LEN_MINUTES + 0`
+INPUT_LEN_SECONDS=`$UTIL_EXPR $INPUT_LEN_SECONDS + 0`
+
+# Convert length to seconds
+INPUT_LENGTH=$((INPUT_LEN_HOURS * 60 * 60))
+INPUT_LENGTH=$((INPUT_LENGTH + INPUT_LEN_MINUTES * 60))
+INPUT_LENGTH=$((INPUT_LENGTH + INPUT_LEN_SECONDS))
+
+# Some temp vars
+TMP_STEP=$((INPUT_LENGTH / SETT_PART_COUNT))
+
+# Check for minimum length
+INPUT_LEN_MINIMUM=$((SETT_PART_COUNT * SETT_PART_DURATION + SETT_CROSSFADE * SETT_PART_DURATION))
+if (( INPUT_LENGTH < INPUT_LEN_MINIMUM )); then
+	$UTIL_ECHO " ✗ File length is too small"
+	exit 1
+fi
+
+# Some temp vars
+TMP_LEN=$((SETT_PART_DURATION + SETT_CROSSFADE))
+TMP_CMD_FILES=""
+TMP_CMD_FILTERS=""
+TMP_CMD_CROSSFADE=""
+TMP_CMD_LAST=""
+
+# Split file to parts and generate filters
+for ((i = 1; i <= SETT_PART_COUNT; i++)); do
+	TMP_S=$((i * TMP_STEP - TMP_STEP))
+	TMP_E=$((i * TMP_STEP - TMP_STEP))
+	TMP_E=$((TMP_E + SETT_PART_DURATION + SETT_CROSSFADE))
+	TMP_CMD="$UTIL_FFMPEG -i $INPUT_FILE -ss $TMP_S -to $TMP_E -c copy -y $TEMP_DIR/$UNIQ_STR_$i.$SETT_FORMAT"
+	TMP_OUTPUT=`$TMP_CMD 2>&1`
+	k=$((i - 1))
+	TMP_CMD_FILES="$TMP_CMD_FILES -i $TEMP_DIR/$UNIQ_STR_$i.$SETT_FORMAT"
+	TMP_CMD_FILTERS="$TMP_CMD_FILTERS[$k]atrim=0:$TMP_LEN[a$i];"
+	if (( i >= 2 )); then
+		if (( i == 2 )); then
+			TMP_CMD_CROSSFADE="$TMP_CMD_CROSSFADE[a$k][a$i]acrossfade=d=$SETT_CROSSFADE[r$k];"
+			TMP_CMD_LAST="r$k"
+		else
+			r=$((k - 1))
+			if (( i >= SETT_PART_COUNT )); then
+				TMP_CMD_CROSSFADE="$TMP_CMD_CROSSFADE[r$r][a$i]acrossfade=d=$SETT_CROSSFADE[r$k]"
+			else
+				TMP_CMD_CROSSFADE="$TMP_CMD_CROSSFADE[r$r][a$i]acrossfade=d=$SETT_CROSSFADE[r$k];"
+			fi
+			TMP_CMD_LAST="r$k"
+		fi
+	fi
+done
+$UTIL_ECHO " ✓ Particles created ($SETT_PART_COUNT)"
+
+# Connect all parts with crosfade effect
+TMP_OUTPUT=`$UTIL_FFMPEG $TMP_CMD_FILES -filter_complex "$TMP_CMD_FILTERS$TMP_CMD_CROSSFADE" -map [$TMP_CMD_LAST] -y $OUTPUT_FILE 2>&1`
+$UTIL_ECHO " ✓ Particles connected together"
+
+# Make fade-in at start and fade-out at the end
+TMP_OUTPUT=`$UTIL_FFMPEG -i $OUTPUT_FILE -af 'afade=t=in:ss=0:d=0.8,afade=t=out:st=25:d=0.8' -y tmp.$OUTPUT_FILE 2>&1`
+$UTIL_RM $OUTPUT_FILE
+$UTIL_MV tmp.$OUTPUT_FILE $OUTPUT_FILE
+$UTIL_ECHO " ✓ FadeIn/FadeOut created"
+
+# Delete temp parts
+for ((i = 1; i <= SETT_PART_COUNT; i++)); do
+	$UTIL_RM $TEMP_DIR/$UNIQ_STR_$i.$SETT_FORMAT
+done
+
+# Perfomance check
+PROC_END=`date +%s`
+PROC_ALL=$((PROC_END - PROC_START))
+$UTIL_ECHO " ✓ Particle files deleted"
+
+# Done
+$UTIL_ECHO " ✓ Done in $PROC_ALL second(s)"
+exit 0