1 files changed, 146 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/alac.c b/lib/rbcodec/codecs/alac.c
new file mode 100644
index 0000000000..144d796e5f
--- /dev/null
+++ b/lib/rbcodec/codecs/alac.c
@@ -0,0 +1,146 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2005 Dave Chapman
+ *
+ * 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 "libm4a/m4a.h"
+#include "libalac/decomp.h"
+
+CODEC_HEADER
+
+/* The maximum buffer size handled. This amount of bytes is buffered for each 
+ * frame. */
+#define ALAC_BYTE_BUFFER_SIZE 32768
+
+static int32_t outputbuffer[ALAC_MAX_CHANNELS][ALAC_BLOCKSIZE] IBSS_ATTR;
+
+/* this is the codec entry point */
+enum codec_status codec_main(enum codec_entry_call_reason reason)
+{
+    if (reason == CODEC_LOAD) {
+        /* Generic codec initialisation */
+        ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
+        ci->configure(DSP_SET_SAMPLE_DEPTH, ALAC_OUTPUT_DEPTH-1);
+    }
+
+    return CODEC_OK;
+}
+
+/* this is called for each file to process */
+enum codec_status codec_run(void)
+{
+    size_t n;
+    demux_res_t demux_res;
+    stream_t input_stream;
+    uint32_t samplesdone;
+    uint32_t elapsedtime = 0;
+    int samplesdecoded;
+    unsigned int i;
+    unsigned char* buffer;
+    alac_file alac;
+    intptr_t param;
+
+    /* Clean and initialize decoder structures */
+    memset(&demux_res , 0, sizeof(demux_res));
+    if (codec_init()) {
+        LOGF("ALAC: Error initialising codec\n");
+        return CODEC_ERROR;
+    }
+
+    ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
+    codec_set_replaygain(ci->id3);
+
+    ci->seek_buffer(0);
+
+    stream_create(&input_stream,ci);
+
+    /* Read from ci->id3->offset before calling qtmovie_read. */
+    samplesdone = (uint32_t)(((uint64_t)(ci->id3->offset) * ci->id3->frequency) /  
+                  (ci->id3->bitrate*128));
+  
+    /* if qtmovie_read returns successfully, the stream is up to
+     * the movie data, which can be used directly by the decoder */
+    if (!qtmovie_read(&input_stream, &demux_res)) {
+        LOGF("ALAC: Error initialising file\n");
+        return CODEC_ERROR;
+    }
+
+    /* initialise the sound converter */
+    alac_set_info(&alac, demux_res.codecdata);
+  
+    /* Set i for first frame, seek to desired sample position for resuming. */
+    i=0;
+    if (samplesdone > 0) {
+        if (m4a_seek(&demux_res, &input_stream, samplesdone,
+                      &samplesdone, (int*) &i)) {
+            elapsedtime = (samplesdone * 10) / (ci->id3->frequency / 100);
+            ci->set_elapsed(elapsedtime);
+        } else {
+            samplesdone = 0;
+        }
+    }
+
+    ci->set_elapsed(elapsedtime);
+
+    /* The main decoding loop */
+    while (i < demux_res.num_sample_byte_sizes) {
+        enum codec_command_action action = ci->get_command(&param);
+
+        if (action == CODEC_ACTION_HALT)
+            break;
+
+        /* Request the required number of bytes from the input buffer */
+        buffer=ci->request_buffer(&n, ALAC_BYTE_BUFFER_SIZE);
+
+        /* Deal with any pending seek requests */
+        if (action == CODEC_ACTION_SEEK_TIME) {
+            if (m4a_seek(&demux_res, &input_stream,
+                         (param/10) * (ci->id3->frequency/100),
+                         &samplesdone, (int *)&i)) {
+                elapsedtime=(samplesdone*10)/(ci->id3->frequency/100);
+            }
+            ci->set_elapsed(elapsedtime);
+            ci->seek_complete();
+        }
+
+        /* Request the required number of bytes from the input buffer */
+        buffer=ci->request_buffer(&n, ALAC_BYTE_BUFFER_SIZE);
+
+        /* Decode one block - returned samples will be host-endian */
+        samplesdecoded=alac_decode_frame(&alac, buffer, outputbuffer, ci->yield);
+        ci->yield();
+
+        /* Advance codec buffer by amount of consumed bytes */
+        ci->advance_buffer(alac.bytes_consumed);
+
+        /* Output the audio */
+        ci->pcmbuf_insert(outputbuffer[0], outputbuffer[1], samplesdecoded);
+
+        /* Update the elapsed-time indicator */
+        samplesdone+=samplesdecoded;
+        elapsedtime=(samplesdone*10)/(ci->id3->frequency/100);
+        ci->set_elapsed(elapsedtime);
+
+        i++;
+    }
+
+    LOGF("ALAC: Decoded %lu samples\n",(unsigned long)samplesdone);
+    return CODEC_OK;
+}