From 6af58c42136a609eecbc44598f27fb92197e95b2 Mon Sep 17 00:00:00 2001
From: Alexey Yakovenko <wakeroid@gmail.com>
Date: Tue, 1 Jun 2010 21:16:22 +0200
Subject: sample-accurate seeking

---
 plugins/tta/ttadec.c  | 13 +++++++++----
 plugins/tta/ttadec.h  |  3 +--
 plugins/tta/ttaplug.c | 18 +++++++++++++-----
 3 files changed, 23 insertions(+), 11 deletions(-)

(limited to 'plugins/tta')

diff --git a/plugins/tta/ttadec.c b/plugins/tta/ttadec.c
index 6eb9d6aa..6610acf7 100644
--- a/plugins/tta/ttadec.c
+++ b/plugins/tta/ttadec.c
@@ -380,8 +380,11 @@ static void seek_table_init (unsigned int *seek_table,
 	}
 }
 
-int set_position (tta_info *info, unsigned int pos) {
-	unsigned int seek_pos;
+int set_position (tta_info *info, unsigned int _pos) {
+    // pos: seek position = seek_time_ms / SEEK_STEP
+//    int pos = _pos / SEEK_STEP * 1000 / info->SAMPLERATE;
+    int pos = _pos / info->framelen;
+    unsigned int seek_pos;
 
 	if (pos >= info->fframes) return 0;
 	if (!info->st_state) {
@@ -401,7 +404,9 @@ int set_position (tta_info *info, unsigned int pos) {
 	// init bit reader
 	init_buffer_read(info);
 
-	return 0;
+    trace ("seek to sample %d, skip %d (%d - %d * %d)\n", _pos, _pos - pos * info->FRAMELEN, _pos, pos, info->FRAMELEN);
+
+	return _pos - pos * info->FRAMELEN;
 }
 
 int player_init (tta_info *info) {
@@ -598,7 +603,7 @@ static unsigned int unpack_sint32 (const char *ptr) {
 
 static int skip_id3_tag (tta_info *info) {
 	int id3v2_size = deadbeef->junk_get_leading_size (info->HANDLE);
-	printf ("id3v2_size: %d\n", id3v2_size);
+	trace ("id3v2_size: %d\n", id3v2_size);
 	if (id3v2_size < 0) {
         id3v2_size = 0;
         deadbeef->rewind (info->HANDLE);
diff --git a/plugins/tta/ttadec.h b/plugins/tta/ttadec.h
index 0e39389b..97064c34 100644
--- a/plugins/tta/ttadec.h
+++ b/plugins/tta/ttadec.h
@@ -134,7 +134,6 @@ typedef struct {
 #define READ_ERROR      5	// Can't read from file
 #define MEMORY_ERROR    6	// Insufficient memory available
 
-#define FRAME_TIME              1.04489795918367346939
 #define SEEK_STEP               (int)(FRAME_TIME * 1000)
 
 #define ISO_BUFFER_LENGTH       (1024*32)
@@ -195,7 +194,7 @@ void    close_tta_file (	// FUNCTION: closes currently playing file
 
 int	set_position (		// FUNCTION: sets playback position
         tta_info *info, // tta context
-        unsigned int pos);	// seek position = seek_time_ms / SEEK_STEP
+        unsigned int pos);	// sample number
 /*
  * RETURN VALUE
  * This function returns 0 if success. Otherwise, -1 is returned
diff --git a/plugins/tta/ttaplug.c b/plugins/tta/ttaplug.c
index e9a3bec3..d3650324 100644
--- a/plugins/tta/ttaplug.c
+++ b/plugins/tta/ttaplug.c
@@ -45,6 +45,7 @@ typedef struct {
     int endsample;
     char buffer[PCM_BUFFER_LENGTH * MAX_BSIZE * MAX_NCH];
     int remaining;
+    int samples_to_skip;
 } tta_info_t;
 
 static DB_fileinfo_t *
@@ -115,6 +116,14 @@ tta_read_int16 (DB_fileinfo_t *_info, char *bytes, int size) {
     int sample_size = ((_info->bps >> 3) * out_channels);
 
     while (size > 0) {
+        if (info->samples_to_skip > 0 && info->remaining > 0) {
+            int skip = min (info->remaining, info->samples_to_skip);
+            if (skip < info->remaining) {
+                memmove (info->buffer, info->buffer + skip * info->tta.BSIZE * info->tta.NCH, (info->remaining - skip) * info->tta.BSIZE * info->tta.NCH);
+            }
+            info->remaining -= skip;
+            info->samples_to_skip -= skip;
+        }
         if (info->remaining > 0) {
             int n = size / sample_size;
             n = min (n, info->remaining);
@@ -132,7 +141,7 @@ tta_read_int16 (DB_fileinfo_t *_info, char *bytes, int size) {
                 p += info->tta.NCH * info->tta.BSIZE;
             }
             if (info->remaining > nn) {
-                memmove (info->buffer, p, (info->remaining - nn) * sizeof (float) * _info->channels);
+                memmove (info->buffer, p, (info->remaining - nn) * info->tta.BSIZE * info->tta.NCH);
             }
             info->remaining -= nn;
         }
@@ -151,15 +160,14 @@ tta_read_int16 (DB_fileinfo_t *_info, char *bytes, int size) {
 static int
 tta_seek_sample (DB_fileinfo_t *_info, int sample) {
     tta_info_t *info = (tta_info_t *)_info;
-    int seek_time = (sample + info->startsample) / SEEK_STEP * 1000 / info->tta.SAMPLERATE;
 
-    if (set_position (&info->tta, seek_time) != 0) {
+    info->samples_to_skip = set_position (&info->tta, sample + info->startsample);
+    if (info->samples_to_skip < 0) {
         fprintf (stderr, "tta: seek failed\n");
         return -1;
     }
-    sample = (seek_time * SEEK_STEP) / 1000 * info->tta.SAMPLERATE;
 
-    info->currentsample = sample - info->startsample;
+    info->currentsample = sample;
     _info->readpos = sample / _info->samplerate;
     return 0;
 }
-- 
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