Support for playback of atrac3 audio in rm, in sim.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22311 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 173 insertions, 0 deletions

diff --git a/apps/codecs/atrac3_rm.c b/apps/codecs/atrac3_rm.c
new file mode 100644
index 0000000000..a9c1c49fea
--- /dev/null
+++ b/apps/codecs/atrac3_rm.c
@@ -0,0 +1,173 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * 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
+
+RMContext rmctx;
+RMPacket pkt;
+ATRAC3Context q;
+
+static void init_rm(RMContext *rmctx)
+{
+    memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
+}
+
+/* this is the codec entry point */
+enum codec_status codec_main(void)
+{ 
+    static size_t buff_size;
+    int datasize, res, consumed, i, time_offset;
+    uint8_t *bit_buffer;
+    int16_t outbuf[2048] __attribute__((aligned(32)));
+    uint16_t fs,sps,h;
+    uint32_t packet_count;
+    int scrambling_unit_size, num_units, elapsed = 0;
+
+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(&pkt,0,sizeof(RMPacket));
+    ci->memset(&q,0,sizeof(ATRAC3Context));
+
+    init_rm(&rmctx);
+ 
+    ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
+    ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
+    ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
+                  STEREO_MONO : STEREO_INTERLEAVED);
+
+    packet_count = rmctx.nb_packets;
+    rmctx.audio_framesize = rmctx.block_align;
+    rmctx.block_align = rmctx.sub_packet_size;
+    fs = rmctx.audio_framesize;
+    sps= rmctx.block_align;
+    h = rmctx.sub_packet_h;
+    scrambling_unit_size = h*fs;
+    
+    res =atrac3_decode_init(&q, &rmctx);
+    if(res < 0) {
+        DEBUGF("failed to initialize atrac decoder\n");
+        return CODEC_ERROR;
+    }
+
+    ci->set_elapsed(0);
+    ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
+
+    /* The main decoder loop */  
+seek_start :         
+    while((unsigned)elapsed < rmctx.duration)
+    {  
+        bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
+        consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
+        if(consumed < 0) {
+            DEBUGF("rm_get_packet failed\n");
+            return CODEC_ERROR;
+        }
+       
+        for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
+        { 
+            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;
+                }       
+
+                ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
+                packet_count = rmctx.nb_packets;
+                rmctx.audio_pkt_cnt = 0;
+                rmctx.frame_number = 0;
+
+                /* Seek to the start of the track */
+                if (ci->seek_time == 1) {
+                    ci->set_elapsed(0);
+                    ci->seek_complete();
+                    goto seek_start;           
+                }                                                                
+                num_units = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate))/(h*(fs/sps));                    
+                ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * num_units);
+                bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
+                consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
+                if(consumed < 0) {
+                     DEBUGF("rm_get_packet failed\n");
+                     return CODEC_ERROR;
+                } 
+                packet_count = rmctx.nb_packets - rmctx.audio_pkt_cnt * num_units;
+                rmctx.frame_number = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate)); 
+                while(rmctx.audiotimestamp > (unsigned) ci->seek_time) {
+                    rmctx.audio_pkt_cnt = 0;
+                    ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * (num_units-1));
+                    bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size); 
+                    consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);                                                                             
+                    packet_count += rmctx.audio_pkt_cnt;
+                    num_units--;
+                }
+                time_offset = ci->seek_time - rmctx.audiotimestamp;
+                i = (time_offset/((sps * 8 * 1000)/rmctx.bit_rate));
+                elapsed = rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i;
+                ci->set_elapsed(elapsed);
+                ci->seek_complete(); 
+            }
+            if(pkt.length)    
+                res = atrac3_decode_frame(&rmctx,&q, outbuf, &datasize, pkt.frames[i], rmctx.block_align);
+            else /* indicates that there are no remaining frames */
+                goto done;
+
+            if(res != rmctx.block_align) {
+                DEBUGF("codec error\n");
+                return CODEC_ERROR;
+            }
+
+            if(datasize)
+                ci->pcmbuf_insert(outbuf, NULL, q.samples_per_frame / rmctx.nb_channels);
+            elapsed = rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i;
+            ci->set_elapsed(elapsed);
+            rmctx.frame_number++;
+        }
+        packet_count -= rmctx.audio_pkt_cnt;
+        rmctx.audio_pkt_cnt = 0;
+        ci->advance_buffer(consumed);
+    }
+
+    done :
+    if (ci->request_next_track())
+        goto next_track;
+
+    return CODEC_OK;    
+}