From 0f5c6d47d4fdd17260b840024880ba6dd3fdf935 Mon Sep 17 00:00:00 2001
From: Yoshihisa Uchida <uchida@rockbox.org>
Date: Thu, 13 May 2010 12:40:09 +0000
Subject: add True Audio (TTA) codec decoding speed iPod video ~153% But in
 some players, the decoding speed is not enough. (e.g., H180 52.4% (thanks
 amiconn), H300 55.09% (thanks n1s))

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25994 a1c6a512-1295-4272-9138-f99709370657
---
 apps/codecs/tta.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 apps/codecs/tta.c

(limited to 'apps/codecs/tta.c')

diff --git a/apps/codecs/tta.c b/apps/codecs/tta.c
new file mode 100644
index 0000000000..541dc2b7ef
--- /dev/null
+++ b/apps/codecs/tta.c
@@ -0,0 +1,132 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2010 Yoshihisa Uchida
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "codeclib.h"
+#include "codecs/libtta/ttalib.h"
+
+CODEC_HEADER
+
+/*
+ * TTA (True Audio) codec:
+ *
+ * References
+ * [1] TRUE AUDIO CODEC SOFTWARE http://true-audio.com/
+ */
+
+static int32_t samples[PCM_BUFFER_LENGTH * 2] IBSS_ATTR;
+
+/* this is the codec entry point */
+enum codec_status codec_main(void)
+{
+    tta_info info;
+    int status = CODEC_OK;
+    unsigned int decodedsamples = 0;
+    int endofstream;
+    int new_pos = 0;
+    int sample_count;
+
+    /* Generic codec initialisation */
+    ci->configure(DSP_SET_SAMPLE_DEPTH, TTA_OUTPUT_DEPTH - 1);
+  
+    if (codec_init())
+    {
+        DEBUGF("codec_init() error\n");
+        status = CODEC_ERROR;
+        goto exit;
+    }
+
+next_track:
+    while (!*ci->taginfo_ready && !ci->stop_codec)
+        ci->sleep(1);
+
+    if (set_tta_info(&info) < 0)
+    {
+        status = CODEC_ERROR;
+        goto exit;
+    }
+    if (player_init(&info) < 0)
+    {
+        status = CODEC_ERROR;
+        goto exit;
+    }
+
+    codec_set_replaygain(ci->id3);
+
+    ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
+    if (info.NCH == 2) {
+        ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
+    } else if (info.NCH == 1) {
+        ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
+    } else {
+        DEBUGF("CODEC_ERROR: more than 2 channels\n");
+        status = CODEC_ERROR;
+        goto done;
+    }
+
+    /* The main decoder loop */
+    endofstream = 0;
+
+    if (ci->id3->offset > 0)
+    {
+        /* Need to save offset for later use (cleared indirectly by advance_buffer) */
+        new_pos = set_position(ci->id3->offset, TTA_SEEK_POS);
+        if (new_pos >= 0)
+            decodedsamples = new_pos;
+        ci->seek_complete();
+    }
+
+    while (!endofstream)
+    {
+        ci->yield();
+        if (ci->stop_codec || ci->new_track)
+            break;
+
+        if (ci->seek_time)
+        {
+            new_pos = set_position(ci->seek_time / SEEK_STEP, TTA_SEEK_TIME);
+            if (new_pos >= 0)
+            {
+                decodedsamples = new_pos;
+                ci->seek_complete();
+            }
+        }
+
+        sample_count = get_samples(samples);
+        if (sample_count < 0)
+        {
+            status = CODEC_ERROR;
+            break;
+        }
+        ci->pcmbuf_insert(samples, NULL, sample_count);
+        decodedsamples += sample_count;
+        if (decodedsamples >= info.DATALENGTH)
+            endofstream = 1;
+        ci->set_elapsed((uint64_t)info.LENGTH * 1000 * decodedsamples / info.DATALENGTH);
+    }
+    status = CODEC_OK;
+done:
+    player_stop();
+    if (ci->request_next_track())
+        goto next_track;
+
+exit:
+    return status;
+}
-- 
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