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-rw-r--r--apps/codecs/atrac3_oma.c158
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diff --git a/apps/codecs/atrac3_oma.c b/apps/codecs/atrac3_oma.c
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+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2009 Mohamed Tarek
+ *
+ * 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 <string.h>
+
+#include "logf.h"
+#include "codeclib.h"
+#include "inttypes.h"
+#include "libatrac/atrac3.h"
+
+CODEC_HEADER
+
+#define FRAMESIZE ci->id3->bytesperframe
+#define BITRATE ci->id3->bitrate
+
+/* The codec has nothing to do with RM, it just uses an RMContext struct to *
+ * store the data needs to be passed to the decoder initializing function. */
+RMContext rmctx;
+ATRAC3Context q IBSS_ATTR;
+
+static void init_rm(RMContext *rmctx, struct mp3entry *id3)
+{
+ rmctx->sample_rate = id3->frequency;
+ rmctx->nb_channels = 2;
+ rmctx->bit_rate = id3->bitrate;
+ rmctx->block_align = id3->bytesperframe;
+
+ /* 14-byte extra-data was faked in the metadata parser so that *
+ * the ATRAC3 decoder would parse it as WAV format extra-data. */
+ rmctx->extradata_size = 14;
+ memcpy(rmctx->codec_extradata, &id3->id3v1buf[0][0], 14);
+}
+
+/* this is the codec entry point */
+enum codec_status codec_main(void)
+{
+ static size_t buff_size;
+ int datasize, res, frame_counter, total_frames, seek_frame_offset;
+ uint8_t *bit_buffer;
+ int elapsed = 0;
+ size_t resume_offset = ci->id3->offset;
+
+next_track:
+ if (codec_init()) {
+ DEBUGF("codec init failed\n");
+ return CODEC_ERROR;
+ }
+ while (!*ci->taginfo_ready && !ci->stop_codec)
+ ci->sleep(1);
+
+ codec_set_replaygain(ci->id3);
+ ci->memset(&rmctx,0,sizeof(RMContext));
+ ci->memset(&q,0,sizeof(ATRAC3Context));
+
+ init_rm(&rmctx, ci->id3);
+
+ ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
+ ci->configure(DSP_SET_SAMPLE_DEPTH, 17); /* Remark: atrac3 uses s15.0 by default, s15.2 was hacked. */
+ ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
+ STEREO_MONO : STEREO_NONINTERLEAVED);
+
+ res =atrac3_decode_init(&q, &rmctx);
+ if(res < 0) {
+ DEBUGF("failed to initialize atrac decoder\n");
+ return CODEC_ERROR;
+ }
+
+ /* check for a mid-track resume and force a seek time accordingly */
+ if(resume_offset > ci->id3->first_frame_offset) {
+ resume_offset -= ci->id3->first_frame_offset;
+ /* calculate resume_offset in frames */
+ resume_offset = (int)resume_offset / FRAMESIZE;
+ ci->seek_time = (int)resume_offset * ((FRAMESIZE * 8)/BITRATE);
+ }
+ total_frames = (ci->id3->filesize - ci->id3->first_frame_offset) / FRAMESIZE;
+ frame_counter = 0;
+
+ ci->set_elapsed(0);
+ ci->advance_buffer(ci->id3->first_frame_offset);
+
+ /* The main decoder loop */
+seek_start :
+ while(frame_counter < total_frames)
+ {
+ bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, FRAMESIZE);
+
+ ci->yield();
+ if (ci->stop_codec || ci->new_track)
+ goto done;
+
+ if (ci->seek_time) {
+ ci->set_elapsed(ci->seek_time);
+
+ /* Do not allow seeking beyond the file's length */
+ if ((unsigned) ci->seek_time > ci->id3->length) {
+ ci->seek_complete();
+ goto done;
+ }
+
+ /* Seek to the start of the track */
+ if (ci->seek_time == 1) {
+ ci->set_elapsed(0);
+ ci->seek_complete();
+ ci->seek_buffer(ci->id3->first_frame_offset);
+ elapsed = 0;
+ goto seek_start;
+ }
+ seek_frame_offset = (ci->seek_time * BITRATE) / (8 * FRAMESIZE);
+ frame_counter = seek_frame_offset;
+ ci->seek_buffer(ci->id3->first_frame_offset + seek_frame_offset* FRAMESIZE);
+ bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, FRAMESIZE);
+ elapsed = ci->seek_time;
+
+ ci->set_elapsed(elapsed);
+ ci->seek_complete();
+ }
+
+ res = atrac3_decode_frame(&rmctx, &q, &datasize, bit_buffer, FRAMESIZE);
+
+ if(res != (int)FRAMESIZE) {
+ DEBUGF("codec error\n");
+ return CODEC_ERROR;
+ }
+
+ if(datasize)
+ ci->pcmbuf_insert(q.outSamples, q.outSamples + 1024, q.samples_per_frame / rmctx.nb_channels);
+
+ elapsed += (FRAMESIZE * 8) / BITRATE;
+ ci->set_elapsed(elapsed);
+
+ ci->advance_buffer(FRAMESIZE);
+ frame_counter++;
+ }
+
+ done:
+ if (ci->request_next_track())
+ goto next_track;
+
+ return CODEC_OK;
+}