From 9669bbc135f3026858f8359555c1c3221d970f7f Mon Sep 17 00:00:00 2001
From: Mohamed Tarek <mt@rockbox.org>
Date: Wed, 18 Nov 2009 00:41:46 +0000
Subject: Handle mid-track resumes in RM.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23659 a1c6a512-1295-4272-9138-f99709370657
---
 apps/codecs/a52_rm.c    | 11 ++++++++++-
 apps/codecs/atrac3_rm.c | 12 +++++++++++-
 apps/codecs/cook.c      | 10 ++++++++++
 apps/codecs/raac.c      | 10 ++++++++++
 4 files changed, 41 insertions(+), 2 deletions(-)

(limited to 'apps/codecs')

diff --git a/apps/codecs/a52_rm.c b/apps/codecs/a52_rm.c
index 32b66d2826..1fe7312e03 100644
--- a/apps/codecs/a52_rm.c
+++ b/apps/codecs/a52_rm.c
@@ -131,7 +131,8 @@ enum codec_status codec_main(void)
     size_t n;
     uint8_t *filebuf;
     int retval, consumed, packet_offset;
-    int playback_on = -1;  
+    int playback_on = -1;
+    size_t resume_offset = ci->id3->offset;
 
     /* Generic codec initialisation */
     ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
@@ -155,6 +156,14 @@ next_track:
     ci->memset(&pkt,0,sizeof(RMPacket));
     init_rm(&rmctx);
 
+    /* check for a mid-track resume and force a seek time accordingly */
+    if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
+        resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
+        /* put number of subpackets to skip in resume_offset */
+        resume_offset /= (rmctx.block_align + PACKET_HEADER_SIZE);
+        ci->seek_time =  (int)resume_offset * ((rmctx.block_align * 8 * 1000)/rmctx.bit_rate);                
+    }
+    
     /* Seek to the first packet */
     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE );
 
diff --git a/apps/codecs/atrac3_rm.c b/apps/codecs/atrac3_rm.c
index 75c0d1581b..d3e00c0e6f 100644
--- a/apps/codecs/atrac3_rm.c
+++ b/apps/codecs/atrac3_rm.c
@@ -45,6 +45,7 @@ enum codec_status codec_main(void)
     uint32_t packet_count;
     int scrambling_unit_size, num_units, elapsed = 0;
     int playback_on = -1;
+    size_t resume_offset = ci->id3->offset;
 
 next_track:
     if (codec_init()) {
@@ -80,6 +81,15 @@ next_track:
         return CODEC_ERROR;
     }
 
+    /* check for a mid-track resume and force a seek time accordingly */
+    if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
+        resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
+        num_units = (int)resume_offset / scrambling_unit_size;        
+        /* put number of subpackets to skip in resume_offset */
+        resume_offset /= (sps + PACKET_HEADER_SIZE);
+        ci->seek_time =  (int)resume_offset * ((sps * 8 * 1000)/rmctx.bit_rate);                
+    }
+    
     ci->set_elapsed(0);
     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 
@@ -98,7 +108,7 @@ seek_start :
             else
                 goto done;
         }
-       
+
         for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
         { 
             ci->yield();
diff --git a/apps/codecs/cook.c b/apps/codecs/cook.c
index c9039a480c..5f91d244ff 100644
--- a/apps/codecs/cook.c
+++ b/apps/codecs/cook.c
@@ -45,6 +45,7 @@ enum codec_status codec_main(void)
     uint16_t fs,sps,h;
     uint32_t packet_count;
     int scrambling_unit_size, num_units;
+    size_t resume_offset = ci->id3->offset;
 
 next_track:
     if (codec_init()) {
@@ -79,6 +80,15 @@ next_track:
         DEBUGF("failed to initialize cook decoder\n");
         return CODEC_ERROR;
     }
+    
+    /* check for a mid-track resume and force a seek time accordingly */
+    if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
+        resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
+        num_units = (int)resume_offset / scrambling_unit_size;    
+        /* put number of subpackets to skip in resume_offset */
+        resume_offset /= (sps + PACKET_HEADER_SIZE);
+        ci->seek_time =  (int)resume_offset * ((sps * 8 * 1000)/rmctx.bit_rate);                
+    }
 
     ci->set_elapsed(0);
     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
diff --git a/apps/codecs/raac.c b/apps/codecs/raac.c
index b886136bd9..516828093d 100644
--- a/apps/codecs/raac.c
+++ b/apps/codecs/raac.c
@@ -48,6 +48,7 @@ enum codec_status codec_main(void)
     uint32_t s = 0; /* sample rate */
     unsigned char c = 0; /* channels */
     int playback_on = -1;
+    size_t resume_offset = ci->id3->offset;
 
     /* Generic codec initialisation */
     ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
@@ -91,6 +92,15 @@ next_track:
         err = CODEC_ERROR;
         goto done;
     }   
+    
+    /* check for a mid-track resume and force a seek time accordingly */
+    if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
+        resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
+        /* put number of subpackets to skip in resume_offset */
+        resume_offset /= (rmctx.block_align + PACKET_HEADER_SIZE);
+        ci->seek_time =  (int)resume_offset * ((rmctx.block_align * 8 * 1000)/rmctx.bit_rate);                
+    }
+    
     ci->id3->frequency = s;    
     ci->set_elapsed(0);
     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
-- 
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