Add seeking via touchscreen

- WAV: works perfectly
- FLAC: works perfectly but just a tad bit slower than WAV.
- MP3: works perfectly but a tad bit slower than FLAC.
- MOD: works perfectly
- OGG: works perfectly however might crash if you use it right after seeking at an index.
- OPUS: works perfectly however WILL crash if you use it right after seeking at an index, but works fine if you wait a second before seeking again. (cannot constantly seek like the others)

include/audio/audio.h

@@ -27,6 +27,7 @@ SceUInt64 Audio_GetPosition(void);
 SceUInt64 Audio_GetLength(void);
 SceUInt64 Audio_GetPositionSeconds(void);
 SceUInt64 Audio_GetLengthSeconds(void);
+void Audio_Seek(SceUInt64 index);
 void Audio_Term(void);
 
 #endif

include/audio/flac.h

@@ -9,6 +9,7 @@ SceUInt8 FLAC_GetChannels(void);
 void FLAC_Decode(void *buf, unsigned int length, void *userdata);
 SceUInt64 FLAC_GetPosition(void);
 SceUInt64 FLAC_GetLength(void);
+SceUInt64 FLAC_Seek(SceUInt64 index);
 void FLAC_Term(void);
 
 #endif

include/audio/mp3.h

@@ -9,6 +9,7 @@ SceUInt8 MP3_GetChannels(void);
 void MP3_Decode(void *buf, unsigned int length, void *userdata);
 SceUInt64 MP3_GetPosition(void);
 SceUInt64 MP3_GetLength(void);
+SceUInt64 MP3_Seek(SceUInt64 index);
 void MP3_Term(void);
 
 #endif

include/audio/ogg.h

@@ -9,6 +9,7 @@ SceUInt8 OGG_GetChannels(void);
 void OGG_Decode(void *buf, unsigned int length, void *userdata);
 SceUInt64 OGG_GetPosition(void);
 SceUInt64 OGG_GetLength(void);
+SceUInt64 OGG_Seek(SceUInt64 index);
 void OGG_Term(void);
 
 #endif

include/audio/opus.h

@@ -9,6 +9,7 @@ SceUInt8 OPUS_GetChannels(void);
 void OPUS_Decode(void *buf, unsigned int length, void *userdata);
 SceUInt64 OPUS_GetPosition(void);
 SceUInt64 OPUS_GetLength(void);
+SceUInt64 OPUS_Seek(SceUInt64 index);
 void OPUS_Term(void);
 
 #endif

include/audio/wav.h

@@ -9,6 +9,7 @@ SceUInt8 WAV_GetChannels(void);
 void WAV_Decode(void *buf, unsigned int length, void *userdata);
 SceUInt64 WAV_GetPosition(void);
 SceUInt64 WAV_GetLength(void);
+SceUInt64 WAV_Seek(SceUInt64 index);
 void WAV_Term(void);
 
 #endif

include/audio/xm.h

@@ -9,6 +9,7 @@ SceUInt8 XM_GetChannels(void);
 void XM_Decode(void *buf, unsigned int length, void *userdata);
 SceUInt64 XM_GetPosition(void);
 SceUInt64 XM_GetLength(void);
+SceUInt64 XM_Seek(SceUInt64 index);
 void XM_Term(void);
 
 #endif

source/audio/audio.c

@@ -279,6 +279,37 @@ SceUInt64 Audio_GetLengthSeconds(void) {
 	return (Audio_GetLength() / Audio_GetSampleRate());
 }
 
+void Audio_Seek(SceUInt64 index) {
+	switch(file_type) {
+		case FILE_TYPE_FLAC:
+			FLAC_Seek(index);
+			break;
+
+		case FILE_TYPE_MP3:
+			MP3_Seek(index);
+			break;
+
+		case FILE_TYPE_OGG:
+			OGG_Seek(index);
+			break;
+
+		case FILE_TYPE_OPUS:
+			OPUS_Seek(index);
+			break;
+
+		case FILE_TYPE_WAV:
+			WAV_Seek(index);
+			break;
+
+		case FILE_TYPE_XM:
+			XM_Seek(index);
+			break;
+
+		default:
+			break;
+	}
+}
+
 void Audio_Term(void) {
 	switch(file_type) {
 		case FILE_TYPE_FLAC:

source/audio/flac.c

@@ -109,7 +109,7 @@ SceUInt8 FLAC_GetChannels(void) {
 void FLAC_Decode(void *buf, unsigned int length, void *userdata) {
 	frames_read += drflac_read_pcm_frames_s16(flac, (drflac_uint64)length, (drflac_int16 *)buf);
 	
-	if (frames_read == flac->totalPCMFrameCount)
+	if (frames_read >= flac->totalPCMFrameCount)
 		playing = SCE_FALSE;
 }
 
@@ -121,6 +121,17 @@ SceUInt64 FLAC_GetLength(void) {
 	return flac->totalPCMFrameCount;
 }
 
+SceUInt64 FLAC_Seek(SceUInt64 index) {
+	drflac_uint64 seek_frame = (flac->totalPCMFrameCount * (index / 450.0));
+	
+	if (drflac_seek_to_pcm_frame(flac, seek_frame) == DRFLAC_TRUE) {
+		frames_read = seek_frame;
+		return frames_read;
+	}
+
+	return -1;
+}
+
 void FLAC_Term(void) {
 	frames_read = 0;
 

source/audio/mp3.c

@@ -123,6 +123,15 @@ int MP3_Init(const char *path) {
 	if (error != MPG123_OK)
 		return error;
 
+	error = mpg123_param(mp3, MPG123_FLAGS, MPG123_FORCE_SEEKABLE | MPG123_FUZZY | MPG123_SEEKBUFFER | MPG123_GAPLESS, 0.0);
+	if (error != MPG123_OK)
+		return error;
+
+	// Let the seek index auto-grow and contain an entry for every frame
+	error = mpg123_param(mp3, MPG123_INDEX_SIZE, -1, 0.0);
+	if (error != MPG123_OK)
+		return error;
+
 	error = mpg123_param(mp3, MPG123_ADD_FLAGS, MPG123_PICTURE, 0.0);
 	if (error != MPG123_OK)
 		return error;
@@ -163,15 +172,16 @@ int MP3_Init(const char *path) {
 		}
 	}
 
-	total_samples = mpg123_length(mp3);
 	mpg123_getformat(mp3, &sample_rate, &channels, NULL);
 	mpg123_format_none(mp3);
-	mpg123_format(mp3, sample_rate, channels, MPG123_ENC_SIGNED_16);
+	mpg123_format(mp3, 44100, channels, MPG123_ENC_SIGNED_16);
+
+	total_samples = mpg123_length(mp3);
 	return 0;
 }
 
 SceUInt32 MP3_GetSampleRate(void) {
-	return sample_rate;
+	return 44100;
 }
 
 SceUInt8 MP3_GetChannels(void) {
@@ -183,7 +193,7 @@ void MP3_Decode(void *buf, unsigned int length, void *userdata) {
 	mpg123_read(mp3, buf, length * (sizeof(SceInt16) * 2), &done);
 	frames_read += done/(sizeof(SceInt16) * 2);
 
-	if (frames_read == total_samples)
+	if (frames_read >= total_samples)
 		playing = SCE_FALSE;
 }
 
@@ -195,6 +205,17 @@ SceUInt64 MP3_GetLength(void) {
 	return total_samples;
 }
 
+SceUInt64 MP3_Seek(SceUInt64 index) {
+	off_t seek_frame = (total_samples * (index / 450.0));
+	
+	if (mpg123_seek(mp3, seek_frame, SEEK_SET) >= 0) {
+		frames_read = seek_frame;
+		return frames_read;
+	}
+
+	return -1;
+}
+
 void MP3_Term(void) {
 	frames_read = 0;
 	

source/audio/ogg.c

@@ -108,7 +108,7 @@ void OGG_Decode(void *buf, unsigned int length, void *userdata) {
 	OGG_FillBuffer((char *)buf);
 	samples_read = ov_pcm_tell(&ogg);
 
-	if (samples_read == max_lenth)
+	if (samples_read >= max_lenth)
 		playing = SCE_FALSE;
 }
 
@@ -120,6 +120,17 @@ SceUInt64 OGG_GetLength(void) {
 	return max_lenth;
 }
 
+SceUInt64 OGG_Seek(SceUInt64 index) {
+	ogg_int64_t seek_sample = (max_lenth * (index / 450.0));
+	
+	if (ov_pcm_seek(&ogg, seek_sample) >= 0) {
+		samples_read = seek_sample;
+		return samples_read;
+	}
+
+	return -1;
+}
+
 void OGG_Term(void) {
 	samples_read = 0;
 

source/audio/opus.c

@@ -86,7 +86,7 @@ void OPUS_Decode(void *buf, unsigned int length, void *userdata) {
 	if (read)
 		samples_read = op_pcm_tell(opus);
 
-	if (samples_read == max_samples)
+	if (samples_read >= max_samples)
 		playing = SCE_FALSE;
 }
 
@@ -98,6 +98,19 @@ SceUInt64 OPUS_GetLength(void) {
 	return max_samples;
 }
 
+SceUInt64 OPUS_Seek(SceUInt64 index) {
+	if (op_seekable(opus) >= 0) {
+		ogg_int64_t seek_sample = (max_samples * (index / 450.0));
+	
+		if (op_pcm_seek(opus, seek_sample) >= 0) {
+			samples_read = seek_sample;
+			return samples_read;
+		}
+	}
+
+	return -1;
+}
+
 void OPUS_Term(void) {
 	samples_read = 0;
 

source/audio/wav.c

@@ -23,7 +23,7 @@ SceUInt8 WAV_GetChannels(void) {
 void WAV_Decode(void *buf, unsigned int length, void *userdata) {
 	frames_read += drwav_read_pcm_frames_s16(&wav, (drwav_uint64)length, (drwav_int16 *)buf);
 
-	if (frames_read == wav.totalPCMFrameCount)
+	if (frames_read >= wav.totalPCMFrameCount)
 		playing = SCE_FALSE;
 }
 
@@ -35,6 +35,17 @@ SceUInt64 WAV_GetLength(void) {
 	return wav.totalPCMFrameCount;
 }
 
+SceUInt64 WAV_Seek(SceUInt64 index) {
+	drwav_uint64 seek_frame = (wav.totalPCMFrameCount * (index / 450.0));
+	
+	if (drwav_seek_to_pcm_frame(&wav, seek_frame) == DRWAV_TRUE) {
+		frames_read = seek_frame;
+		return frames_read;
+	}
+
+	return -1;
+}
+
 void WAV_Term(void) {
 	frames_read = 0;
 	drwav_uninit(&wav);

source/audio/xm.c

@@ -10,7 +10,9 @@ static SceUInt64 samples_read = 0, total_samples = 0;
 
 int XM_Init(const char *path) {
 	xmp = xmp_create_context();
-	if (xmp_load_module(xmp, (char *)path) < 0)
+	char *xmp_path = strdup(path);
+
+	if (xmp_load_module(xmp, xmp_path) < 0)
 		return -1;
 
 	xmp_start_player(xmp, 44100, 0);
@@ -38,7 +40,7 @@ void XM_Decode(void *buf, unsigned int length, void *userdata) {
 	xmp_play_buffer(xmp, buf, (int)length * (sizeof(SceInt16) * 2), 0);
 	samples_read += length;
 
-	if (samples_read == total_samples)
+	if (samples_read >= total_samples)
 		playing = SCE_FALSE;
 }
 
@@ -50,6 +52,17 @@ SceUInt64 XM_GetLength(void) {
 	return total_samples;
 }
 
+SceUInt64 XM_Seek(SceUInt64 index) {
+	int seek_sample = (total_samples * (index / 450.0));
+	
+	if (xmp_seek_time(xmp, seek_sample/44.1) >= 0) {
+		samples_read = seek_sample;
+		return samples_read;
+	}
+
+	return -1;
+}
+
 void XM_Term(void) {
 	samples_read = 0;
 	xmp_end_player(xmp);

source/menus/menu_audioplayer.c

@@ -217,6 +217,18 @@ void Menu_PlayAudio(char *path) {
 		if (pressed & SCE_CTRL_ENTER)
 			Audio_Pause();
 
+		if (Touch_CheckHeld() && Touch_GetX() >= 460 && Touch_GetX() <= 910 && Touch_GetY() >= 480 && Touch_GetY() <= 505) {
+			// Pause first if not paused.
+			if (!Audio_IsPaused())
+				Audio_Pause();
+
+			Audio_Seek(Touch_GetX() - 460);
+
+			// Unpause.
+			if (Audio_IsPaused())
+				Audio_Pause();
+		}
+
 		if (pressed & SCE_CTRL_TRIANGLE) {
 			if (state == MUSIC_STATE_SHUFFLE)
 				state = MUSIC_STATE_NONE;