From e5fbf41bbba952ef4fe089b7557f49ff2aa8a7f8 Mon Sep 17 00:00:00 2001
From: Alexey Yakovenko <wakeroid@gmail.com>
Date: Tue, 22 Sep 2009 08:56:37 +0200
Subject: flac sample-accuracy WIP

---
 plugins/flac/flac.c | 59 +++++++++++++++++++++++++++++++++--------------------
 1 file changed, 37 insertions(+), 22 deletions(-)

(limited to 'plugins/flac')

diff --git a/plugins/flac/flac.c b/plugins/flac/flac.c
index 3e688446..ddf8e02c 100644
--- a/plugins/flac/flac.c
+++ b/plugins/flac/flac.c
@@ -24,6 +24,9 @@
 static DB_decoder_t plugin;
 static DB_functions_t *deadbeef;
 
+#define trace(...) { fprintf(stderr, __VA_ARGS__); }
+//#define trace(fmt,...)
+
 #define min(x,y) ((x)<(y)?(x):(y))
 #define max(x,y) ((x)>(y)?(x):(y))
 
@@ -35,6 +38,7 @@ static float timestart;
 static float timeend;
 static int startsample;
 static int endsample;
+static int currentsample;
 
 typedef struct {
     DB_playItem_t *after;
@@ -154,18 +158,23 @@ cflac_init (DB_playItem_t *it) {
         cflac_free ();
         return -1;
     }
-    if (timeend > timestart || timeend < 0) {
+    if (it->timeend > 0) {
         timestart = it->timestart;
         timeend = it->timeend;
         startsample = it->startsample;
         endsample = it->endsample;
-        plugin.seek_sample (0);
+        if (plugin.seek_sample (0) < 0) {
+            cflac_free ();
+            return -1;
+        }
     }
     else {
         timestart = 0;
         timeend = it->duration;
         startsample = 0;
         endsample = cb.totalsamples-1;
+        currentsample = 0;
+        trace ("startsample=%d, endsample=%d\n", startsample, endsample);
     }
     plugin.info.readpos = 0;
 
@@ -184,12 +193,22 @@ cflac_free (void) {
 static int
 cflac_read_int16 (char *bytes, int size) {
     int initsize = size;
-    int nsamples = size / (plugin.info.channels * plugin.info.bps / 8);
-    if (timeend > timestart) {
-        if (plugin.info.readpos + timestart > timeend) {
+    if (size / (2 * plugin.info.channels) + currentsample > endsample) {
+        size = (endsample - currentsample + 1) * 2 * plugin.info.channels;
+        trace ("size truncated to %d bytes, cursample=%d, endsample=%d\n", size, currentsample, endsample);
+        if (size <= 0) {
             return 0;
         }
     }
+//    int nsamples = size / (plugin.info.channels * plugin.info.bps / 8);
+//    if (currentsample + nsamples > endsample) {
+//        nsamples = endsample-currentsample+1;
+//    }
+//    if (timeend > timestart) {
+//        if (plugin.info.readpos + timestart > timeend) {
+//            return 0;
+//        }
+//    }
     do {
         if (remaining) {
             int s = size * 2;
@@ -206,12 +225,13 @@ cflac_read_int16 (char *bytes, int size) {
                 memmove (buffer, &buffer[sz], remaining-sz);
             }
             remaining -= sz;
+            currentsample += sz / (2 * plugin.info.channels);
             plugin.info.readpos += (float)sz / (plugin.info.channels * plugin.info.samplerate * sizeof (float));
-            if (timeend > timestart) {
-                if (plugin.info.readpos + timestart > timeend) {
-                    break;
-                }
-            }
+//            if (timeend > timestart) {
+//                if (plugin.info.readpos + timestart > timeend) {
+//                    break;
+//                }
+//            }
         }
         if (!size) {
             break;
@@ -267,17 +287,6 @@ cflac_read_float32 (char *bytes, int size) {
     return initsize - size;
 }
 
-static int
-cflac_seek (float time) {
-    time += timestart;
-    if (!FLAC__stream_decoder_seek_absolute (decoder, (FLAC__uint64)(time * plugin.info.samplerate))) {
-        return -1;
-    }
-    remaining = 0;
-    plugin.info.readpos = time - timestart;
-    return 0;
-}
-
 static int
 cflac_seek_sample (int sample) {
     sample += startsample;
@@ -285,10 +294,16 @@ cflac_seek_sample (int sample) {
         return -1;
     }
     remaining = 0;
+    currentsample = sample;
     plugin.info.readpos = (float)sample / plugin.info.samplerate - timestart;
     return 0;
 }
 
+static int
+cflac_seek (float time) {
+    return cflac_seek_sample (time * plugin.info.samplerate);
+}
+
 static FLAC__StreamDecoderWriteStatus
 cflac_init_write_callback (const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const inputbuffer[], void *client_data) {
     if (frame->header.blocksize == 0 || cflac_init_stop_decoding) {
@@ -492,7 +507,7 @@ static DB_decoder_t plugin = {
     .init = cflac_init,
     .free = cflac_free,
     .read_int16 = cflac_read_int16,
-    .read_float32 = cflac_read_float32,
+//    .read_float32 = cflac_read_float32,
     .seek = cflac_seek,
     .seek_sample = cflac_seek_sample,
     .insert = cflac_insert,
-- 
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