Add vox (Dialogic telephony formats) codec add. (FS#11021)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24956 a1c6a512-1295-4272-9138-f99709370657
2010-02-28 08:13:30 +00:00 · 2010-02-28 08:13:30 +00:00 · 8c5eaa35ec
commit 8c5eaa35ec
parent 4e3c807466
9 changed files with 241 additions and 0 deletions
--- a/apps/codecs/vox.c
+++ b/apps/codecs/vox.c
@ -0,0 +1,181 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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/libpcm/support_formats.h"
+
+CODEC_HEADER
+
+/* vox codec (Dialogic telephony file formats) */
+
+#define PCM_SAMPLE_SIZE (2048)
+
+static int32_t samples[PCM_SAMPLE_SIZE] IBSS_ATTR;
+
+static struct pcm_format format;
+static uint32_t bytesdone;
+
+static uint8_t *read_buffer(size_t *realsize)
+{
+    uint8_t *buffer = (uint8_t *)ci->request_buffer(realsize, format.chunksize);
+    if (bytesdone + (*realsize) > format.numbytes)
+        *realsize = format.numbytes - bytesdone;
+    bytesdone += *realsize;
+    ci->advance_buffer(*realsize);
+    return buffer;
+}
+
+/* this is the codec entry point */
+enum codec_status codec_main(void)
+{
+    int status = CODEC_OK;
+    uint32_t decodedsamples;
+    size_t n;
+    int bufcount;
+    int endofstream;
+    uint8_t *voxbuf;
+    off_t firstblockposn;     /* position of the first block in file */
+    const struct pcm_codec *codec;
+    int offset = 0;
+
+    /* Generic codec initialisation */
+    ci->configure(DSP_SET_SAMPLE_DEPTH, 28);
+  
+next_track:
+    if (codec_init()) {
+        DEBUGF("codec_init() error\n");
+        status = CODEC_ERROR;
+        goto exit;
+    }
+
+    while (!*ci->taginfo_ready && !ci->stop_codec)
+        ci->sleep(1);
+
+    codec_set_replaygain(ci->id3);
+    
+    ci->memset(&format, 0, sizeof(struct pcm_format));
+
+    /* set format */
+    format.channels      = 1;
+    format.bitspersample = 4;
+    format.numbytes      = ci->id3->filesize;
+    format.blockalign    = 1;
+
+    /* advance to first WAVE chunk */
+    ci->advance_buffer(offset);
+
+    firstblockposn = offset;
+
+    decodedsamples = 0;
+    bytesdone = 0;
+
+    /*
+     * get codec
+     * supports dialogic oki adpcm only
+     */
+    codec = get_dialogic_oki_adpcm_codec();
+    if (!codec)
+    {
+        DEBUGF("CODEC_ERROR: dialogic oki adpcm codec does not load.\n");
+        status = CODEC_ERROR;
+        goto done;
+    }
+
+    if (!codec->set_format(&format))
+    {
+        status = CODEC_ERROR;
+        goto done;
+    }
+
+    if (format.numbytes == 0) {
+        DEBUGF("CODEC_ERROR: data size is 0\n");
+        status = CODEC_ERROR;
+        goto done;
+    }
+
+    /* check chunksize */
+    if (format.chunksize * 2 > PCM_SAMPLE_SIZE)
+        format.chunksize = PCM_SAMPLE_SIZE / 2;
+    if (format.chunksize == 0)
+    {
+        DEBUGF("CODEC_ERROR: chunksize is 0\n");
+        status = CODEC_ERROR;
+        goto done;
+    }
+
+    ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
+    ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
+
+    /* The main decoder loop */
+    endofstream = 0;
+
+    while (!endofstream) {
+        ci->yield();
+        if (ci->stop_codec || ci->new_track) {
+            break;
+        }
+
+        if (ci->seek_time) {
+            struct pcm_pos *newpos = codec->get_seek_pos(ci->seek_time, &read_buffer);
+
+            decodedsamples = newpos->samples;
+            if (newpos->pos > format.numbytes)
+                break;
+            if (ci->seek_buffer(firstblockposn + newpos->pos))
+            {
+                bytesdone = newpos->pos;
+            }
+            ci->seek_complete();
+        }
+
+        voxbuf = (uint8_t *)ci->request_buffer(&n, format.chunksize);
+        if (n == 0)
+            break; /* End of stream */
+        if (bytesdone + n > format.numbytes) {
+            n = format.numbytes - bytesdone;
+            endofstream = 1;
+        }
+
+        status = codec->decode(voxbuf, n, samples, &bufcount);
+        if (status == CODEC_ERROR)
+        {
+            DEBUGF("codec error\n");
+            goto done;
+        }
+
+        ci->pcmbuf_insert(samples, NULL, bufcount);
+        ci->advance_buffer(n);
+        bytesdone += n;
+        decodedsamples += bufcount;
+
+        if (bytesdone >= format.numbytes)
+            endofstream = 1;
+        ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency);
+    }
+    status = CODEC_OK;
+
+done:
+    if (ci->request_next_track())
+        goto next_track;
+
+exit:
+    return status;
+}