The VideoLAN Forums

Posted: **17 Jan 2021 15:32**

Occasionally I will come across audio files that are entire albums instead of being broken down into individual tracks.
Is there currently any way to create a playlist that lists all of the start and stop times of each track, which could then be navigated with VLC's playlist view as if they were individual tracks?

Posted: **17 Jan 2021 22:20**

After looking into the xspf format, I found that vlc has the following options:

Code: Select all

<vlc:option>start-time=TIME</vlc:option>
<vlc:option>stop-time=TIME</vlc:option>

Though it would still be nice if the trackbar focused on the start/stop time specified. If the album is long but the specific track is short, it becomes virtually impossible to seek with the trackbar. And despite specifying a duration for each track, that seems to be ignored and the duration of the full album is displayed instead.

Also, my understanding is that these options only work with a few file formats (avi, mov, mkv, mp4), so if it's an mp3, flac, etc., presumably it won't be a viable option.

Posted: **19 Jan 2021 17:46**

I ended up making a git patch for this. Probably doesn't warrant a pull request but here it is for anyone interested:

Code: Select all

diff --git a/src/input/es_out.c b/src/input/es_out.c
index 5a2b194688..895244bf4b 100644
--- a/src/input/es_out.c
+++ b/src/input/es_out.c
@@ -2791,8 +2791,12 @@ static int EsOutControlLocked( es_out_t *out, int i_query, va_list args )
         double f_position = va_arg( args, double );
         mtime_t i_time = va_arg( args, mtime_t );
         mtime_t i_length = va_arg( args, mtime_t );
+        int64_t i_run = input_priv(p_sys->p_input)->i_run;
 
-        input_SendEventLength( p_sys->p_input, i_length );
+        if( i_run )
+            input_SendEventLength( p_sys->p_input, i_run );
+        else
+            input_SendEventLength( p_sys->p_input, i_length );
 
         if( !p_sys->b_buffering )
         {
@@ -2809,6 +2813,14 @@ static int EsOutControlLocked( es_out_t *out, int i_query, va_list args )
             if( i_time < 0 )
                 i_time = 0;
 
+            if( i_run )
+            {
+                int64_t i_start = input_priv(p_sys->p_input)->i_start;
+                i_time -= i_start;
+                f_position = ( f_position - (double)i_start / i_length )
+                           * input_priv(p_sys->p_input)->f_ratio;
+                i_length = i_run;
+            }
             if( i_length > 0 )
                 f_position -= (double)i_delay / i_length;
             if( f_position < 0 )
diff --git a/src/input/input.c b/src/input/input.c
index 1b8a2eb83d..0f2f2fb703 100644
--- a/src/input/input.c
+++ b/src/input/input.c
@@ -956,7 +956,9 @@ static void StartTitle( input_thread_t * p_input )
             priv->i_stop += priv->i_start;
     }
 
-    if( priv->i_start > 0 )
+    if( priv->i_start < 0 )
+        priv->i_start = 0;
+    else if( priv->i_start > 0 )
     {
         vlc_value_t s;
 
@@ -971,6 +973,20 @@ static void StartTitle( input_thread_t * p_input )
         msg_Warn( p_input, "invalid stop-time ignored" );
         priv->i_stop = 0;
     }
+
+    mtime_t i_duration = priv->p_item->i_duration;
+    if( i_duration > 0 && ( priv->i_start || priv->i_stop ) )
+    {
+        if( priv->i_stop > i_duration || ( priv->i_start && !priv->i_stop ) )
+            priv->i_stop = i_duration;
+
+        priv->i_run = priv->i_stop - priv->i_start;
+        if( priv->i_run )
+        {
+            priv->f_ratio = (double)i_duration / priv->i_run;
+            priv->p_item->i_duration = priv->i_run;
+        }
+    }
     priv->b_fast_seek = var_GetBool( p_input, "input-fast-seek" );
 }
 
@@ -1987,6 +2003,14 @@ static bool Control( input_thread_t *p_input,
             }
 
             float f_pos = val.f_float;
+            int64_t i_run = input_priv(p_input)->i_run;
+            if( i_run )
+            {
+                int64_t i_duration = input_priv(p_input)->f_ratio * i_run;
+                i_run *= f_pos;
+                i_run += input_priv(p_input)->i_start;
+                f_pos = (double)i_run / i_duration;
+            }
             if( f_pos < 0.f )
                 f_pos = 0.f;
             else if( f_pos > 1.f )
diff --git a/src/input/input_internal.h b/src/input/input_internal.h
index af9b35967d..890f7fbfed 100644
--- a/src/input/input_internal.h
+++ b/src/input/input_internal.h
@@ -100,9 +100,11 @@ typedef struct input_thread_private_t
     int         i_rate;
 
     /* Playtime configuration and state */
-    int64_t     i_start;    /* :start-time,0 by default */
-    int64_t     i_stop;     /* :stop-time, 0 if none */
     int64_t     i_time;     /* Current time */
+    int64_t     i_start;    /* :start-time, 0 by default */
+    int64_t     i_stop;     /* :stop-time, 0 if none */
+    int64_t     i_run;      /* :run-time (i_stop - i_start) */
+    double      f_ratio;    /* i_duration / i_run */
     bool        b_fast_seek;/* :input-fast-seek */
 
     /* Output */
diff --git a/src/input/var.c b/src/input/var.c
index 631b571c19..dd339dafb0 100644
--- a/src/input/var.c
+++ b/src/input/var.c
@@ -624,6 +624,7 @@ static int TimeCallback( vlc_object_t *p_this, char const *psz_cmd,
         var_SetInteger( p_input, "intf-event", INPUT_EVENT_POSITION );
     }
 
+    newval.i_int += input_priv(p_input)->i_start;
     input_ControlPush( p_input, INPUT_CONTROL_SET_TIME, &newval );
     return VLC_SUCCESS;
 }

This makes it so that the trackbar focuses in on the start/stop time specified in the xspf file.
These changes were made in vlc-3.0

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Create playlist for one file that is a full album

Create playlist for one file that is a full album

Re: Create playlist for one file that is a full album

Re: Create playlist for one file that is a full album