Add codecs to librbcodec.

Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>

lib/rbcodec/codecs/mpc.c

@@ -0,0 +1,186 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2005 Thom Johansen
+ *
+ * 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/libmusepack/mpcdec.h>
+#include <codecs/libmusepack/internal.h>
+
+CODEC_HEADER
+
+static MPC_SAMPLE_FORMAT sample_buffer[MPC_DECODER_BUFFER_LENGTH] IBSS_ATTR;
+
+/* Our implementations of the mpc_reader callback functions. */
+static mpc_int32_t read_impl(mpc_reader *reader, void *ptr, mpc_int32_t size)
+{
+    (void)reader;
+    return ((mpc_int32_t)(ci->read_filebuf(ptr, size)));
+}
+
+static mpc_bool_t seek_impl(mpc_reader *reader, mpc_int32_t offset)
+{
+    (void)reader;
+    return ci->seek_buffer(offset);
+}
+
+static mpc_int32_t tell_impl(mpc_reader *reader)
+{
+    (void)reader;
+    return ci->curpos;
+}
+
+static mpc_int32_t get_size_impl(mpc_reader *reader)
+{
+    (void)reader;
+    return ci->filesize;
+}
+
+/* this is the codec entry point */
+enum codec_status codec_main(enum codec_entry_call_reason reason)
+{
+    if (reason == CODEC_LOAD) {
+        /* musepack's sample representation is 18.14
+         * DSP_SET_SAMPLE_DEPTH = 14 (FRACT) + 16 (NATIVE) - 1 (SIGN) = 29 */
+        ci->configure(DSP_SET_SAMPLE_DEPTH, 29);
+    }
+
+    return CODEC_OK;
+}
+
+/* this is called for each file to process */
+enum codec_status codec_run(void)
+{
+    mpc_int64_t samplesdone;
+    uint32_t frequency;     /* 0.1 kHz accuracy */
+    uint32_t elapsed_time;  /* milliseconds */
+    uint32_t byterate;      /* bytes per second */
+    mpc_status status;
+    mpc_reader reader;
+    mpc_streaminfo info;
+    mpc_frame_info frame;
+    mpc_demux *demux = NULL;
+    intptr_t param;
+    
+    frame.buffer = sample_buffer;
+
+    /* Create a decoder instance */
+    reader.read     = read_impl;
+    reader.seek     = seek_impl;
+    reader.tell     = tell_impl;
+    reader.get_size = get_size_impl;
+
+    if (codec_init()) 
+        return CODEC_ERROR;
+
+    /* Prep position */
+    ci->seek_buffer(0);
+
+    /* Initialize demux/decoder. */
+    demux = mpc_demux_init(&reader);
+    if (NULL == demux)
+        return CODEC_ERROR;
+
+    /* Read file's streaminfo data. */
+    mpc_demux_get_info(demux, &info);
+    
+    byterate  = (mpc_uint32_t)(info.average_bitrate) / 8;
+    frequency = info.sample_freq / 100; /* 0.1 kHz accuracy */
+    ci->configure(DSP_SWITCH_FREQUENCY, info.sample_freq);
+
+    /* Remark: rockbox offset is the file offset in bytes. So, estimate the 
+     * sample seek position from the file offset, the sampling frequency and
+     * the bitrate. As the saved position is exactly calculated the reverse way 
+     * there is no loss of information except rounding. */
+    samplesdone = 100 * (((mpc_uint64_t)ci->id3->offset * frequency) / byterate);
+        
+    /* Set up digital signal processing for correct number of channels */
+    /* NOTE: current musepack format only allows for stereo files
+       but code is here to handle other configurations anyway */
+    if      (info.channels == 2)
+        ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
+    else if (info.channels == 1)
+        ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
+    else
+        return CODEC_ERROR;
+    
+    codec_set_replaygain(ci->id3);
+
+    /* Resume to saved sample offset. */
+    elapsed_time = 0;
+
+    if (samplesdone > 0) 
+    {
+        if (mpc_demux_seek_sample(demux, samplesdone) == MPC_STATUS_OK) 
+        {
+            elapsed_time = (samplesdone*10)/frequency;
+        } 
+        else 
+        {
+            samplesdone = 0;
+        }
+    }
+
+    ci->set_elapsed(elapsed_time);
+
+    /* This is the decoding loop. */
+    do 
+    {
+        enum codec_command_action action = ci->get_command(&param);
+
+        if (action == CODEC_ACTION_HALT)
+            return CODEC_OK;
+
+        /* Complete seek handler. */
+        if (action == CODEC_ACTION_SEEK_TIME) 
+        {
+            mpc_int64_t new_offset = (param/10)*frequency;
+            if (mpc_demux_seek_sample(demux, new_offset) == MPC_STATUS_OK) 
+            {
+                samplesdone = new_offset;
+            }
+
+            elapsed_time = (samplesdone*10)/frequency;
+            ci->set_elapsed(elapsed_time);
+            ci->seek_complete();
+        }
+
+        /* Decode one frame. */
+        status = mpc_demux_decode(demux, &frame);
+        ci->yield();
+        if (frame.bits == -1)
+        {
+            /* Decoding error, exit decoding loop. */
+            return (status == MPC_STATUS_OK) ? CODEC_OK : CODEC_ERROR;
+        } 
+        else 
+        {
+            /* Decoding passed, insert samples to PCM buffer. */
+            ci->pcmbuf_insert(frame.buffer,
+                              frame.buffer + MPC_FRAME_LENGTH,
+                              frame.samples);
+            samplesdone += frame.samples;
+            elapsed_time = (samplesdone*10)/frequency;
+            ci->set_elapsed(elapsed_time);
+            /* Remark: rockbox offset is the file offset in bytes. So estimate 
+             * this offset from the samples, sampling frequency and bitrate */
+            ci->set_offset( (samplesdone * byterate)/(frequency*100) );
+        }
+    } while (true);
+}