From c07aa3c9a8a45f6d9159426dd297774daeaa36a2 Mon Sep 17 00:00:00 2001
From: veclavtalica <veclvatalica@poto.cafe>
Date: Mon, 8 Jul 2024 18:00:38 +0300
Subject: [PATCH] implement repeat in libxm

---
 src/audio.c              | 45 +++++++++++++++++++++++++++-------------
 src/game/scenes/ingame.c |  5 +++--
 2 files changed, 34 insertions(+), 16 deletions(-)

diff --git a/src/audio.c b/src/audio.c
index 8868697..b85e1ce 100644
--- a/src/audio.c
+++ b/src/audio.c
@@ -130,6 +130,8 @@ static union audio_context init_audio_context(const char *path, t_audio_file_typ
             break;
         }
 
+        xm_set_max_loop_count(handle, 1);
+
         return (union audio_context) {
             .xm = { .handle = handle }
         };
@@ -250,19 +252,21 @@ static void audio_sample_and_mixin_channel(const struct audio_channel *channel,
 
             /* handle end of file */
             if (samples_per_channel == 0) {
-                if (channel->args.repeat)
+                if (channel->args.repeat) {
                     /* seek to start and try sampling some more */
                     stb_vorbis_seek_start(channel->context.vorbis.handle);
-                else
+                    continue;
+                } else
                     /* leave silence */
                     break;
             }
 
             /* panning and mixing */
-            audio_mixin_streams(channel, &stream[i * sizeof(int16_t)], buffer,
-                samples_per_channel * ctx.audio_stream_channel_count);
+            audio_mixin_streams(channel,
+                                &stream[i * sizeof(int16_t)], buffer,
+                                samples_per_channel * 2);
 
-            i += samples_per_channel * ctx.audio_stream_channel_count;
+            i += samples_per_channel * 2;
         }
 
         break;
@@ -273,19 +277,32 @@ static void audio_sample_and_mixin_channel(const struct audio_channel *channel,
             const int n_frames = (stream_frames - i) > float_buffer_frames ?
                 float_buffer_frames : stream_frames - i;
 
-            /* TODO: make it report generated frame count and stop right before looping */
-            xm_generate_samples(channel->context.xm.handle, (float *)buffer, n_frames / 2);
+            const int samples_per_channel = xm_generate_samples(channel->context.xm.handle,
+                                                                (float *)buffer,
+                                                                n_frames / 2);
 
-            /* convert floats to int16_t */
-            for (int p = 0; p < n_frames; ++p) {
-                const int16_t value = (int16_t)(((float *)buffer)[p] * 32768.0f);
-                ((int16_t *)buffer)[p] = value;
+            /* handle end of file */
+            if (samples_per_channel == 0) {
+                if (channel->args.repeat) {
+                    /* seek to start and try sampling some more */
+                    xm_restart(channel->context.xm.handle);
+                    continue;
+                } else
+                    /* leave silence */
+                    break;
             }
 
-            /* panning and mixing */
-            audio_mixin_streams(channel, &stream[i * sizeof(int16_t)], buffer, n_frames);
+            /* convert floats to int16_t */
+            for (int p = 0; p < samples_per_channel * 2; ++p)
+                ((int16_t *)buffer)[p] = (int16_t)(((float *)buffer)[p] * 32768.0f);
 
-            i += n_frames;
+            /* panning and mixing */
+            audio_mixin_streams(channel,
+                                &stream[i * sizeof(int16_t)],
+                                buffer,
+                                samples_per_channel * 2);
+
+            i += samples_per_channel * 2;
         }
 
         break;
diff --git a/src/game/scenes/ingame.c b/src/game/scenes/ingame.c
index 749f3a3..00cb944 100644
--- a/src/game/scenes/ingame.c
+++ b/src/game/scenes/ingame.c
@@ -30,9 +30,10 @@ struct scene *ingame_scene(struct state *state) {
     new_scene->world = world_create();
     new_scene->player = player_create(new_scene->world);
 
-    play_audio_ex("music/test.ogg", "soundtrack", (t_play_audio_args){
+    play_audio_ex("music/repeat-test.xm", "soundtrack", (t_play_audio_args){
         .volume = 0.8f,
-        .panning = -0.5f
+        .panning = -0.5f,
+        .repeat = true,
     });
 
     return (struct scene *)new_scene;