Modify the test program to read audio frames from a memory buffer rather

than a file descriptor, to make the decoding process as much similar 
as to how it should be in rockbox.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21042 a1c6a512-1295-4272-9138-f99709370657

3 files changed, 86 insertions, 10 deletions

diff --git a/apps/codecs/libcook/main.c b/apps/codecs/libcook/main.c
index b0b2829f25..3557b15524 100644
--- a/apps/codecs/libcook/main.c
+++ b/apps/codecs/libcook/main.c
@@ -37,6 +37,7 @@
 #  endif
 #endif
 
+#define DATA_HEADER_SIZE 18 /* size of DATA chunk header in a rm file */
 static unsigned char wav_header[44]={
     'R','I','F','F',//  0 - ChunkID
     0,0,0,0,        //  4 - ChunkSize (filesize-8)
@@ -127,7 +128,6 @@ int main(int argc, char *argv[])
     int fd_out;
 #endif
     int16_t outbuf[2048];
-    uint8_t inbuf[1024];
     uint16_t fs,sps,h;
     uint32_t packet_count;
     COOKContext q;
@@ -149,6 +149,10 @@ int main(int argc, char *argv[])
         return -1;
     }
     
+    /* copy the input rm file to a memory buffer */
+    uint8_t * filebuf = (uint8_t *)calloc((int)filesize(fd),sizeof(uint8_t));
+    read(fd,filebuf,filesize(fd)); 
+
     fd_dec = open_wav("output.wav");
     if (fd_dec < 0) {
         DEBUGF("Error creating output file\n");
@@ -169,11 +173,12 @@ int main(int argc, char *argv[])
         packet_count += h - (packet_count % h);
         rmctx.nb_packets = packet_count;
     }
+
+    /* change the buffer pointer to point at the first audio frame */
+    advance_buffer(&filebuf, rmctx.data_offset+ DATA_HEADER_SIZE);
     while(packet_count)
     {  
-        
-        memset(pkt.data,0,sizeof(pkt.data));
-        rm_get_packet(fd, &rmctx, &pkt);
+        rm_get_packet_membuf(&filebuf, &rmctx, &pkt);
         DEBUGF("total frames = %d packet count = %d output counter = %d \n",rmctx.audio_pkt_cnt*(fs/sps), packet_count,rmctx.audio_pkt_cnt);
         for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
         { 
@@ -181,12 +186,11 @@ int main(int argc, char *argv[])
             #ifdef DUMP_RAW_FRAMES 
               snprintf(filename,sizeof(filename),"dump%d.raw",++x);
               fd_out = open(filename,O_WRONLY|O_CREAT|O_APPEND);           
-              write(fd_out,pkt.data+i*sps,sps);  
+              write(fd_out,pkt.frames[i],sps);  
               close(fd_out);
             #endif
 
-            memcpy(inbuf,pkt.data+i*sps,sps);
-            nb_frames = cook_decode_frame(&rmctx,&q, outbuf, &datasize, inbuf , rmctx.block_align);
+            nb_frames = cook_decode_frame(&rmctx,&q, outbuf, &datasize, pkt.frames[i] , rmctx.block_align);
             rmctx.frame_number++;
             write(fd_dec,outbuf,datasize);        
         }
diff --git a/apps/codecs/libcook/rm.c b/apps/codecs/libcook/rm.c
index 92b6428462..b2ccfc2480 100644
--- a/apps/codecs/libcook/rm.c
+++ b/apps/codecs/libcook/rm.c
@@ -38,6 +38,21 @@
 #endif
            
 /* Some Rockbox-like functions (these should be implemented in metadata_common.[ch] */
+static uint8_t get_uint8(uint8_t *buf)
+{
+    return (uint8_t)buf[0];
+}
+
+static uint16_t get_uint16be(uint8_t *buf)
+{
+    return (uint16_t)((buf[0] << 8)|buf[1]);
+}
+
+static uint32_t get_uint32be(uint8_t *buf)
+{
+    return (uint32_t)((buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]);
+}
+
 static int read_uint8(int fd, uint8_t* buf)
 {
     unsigned char tmp[1];
@@ -79,6 +94,11 @@ off_t filesize(int fd)
   }
 }
 
+void advance_buffer(uint8_t **buf, int val)
+{
+    *buf += val;
+}
+
 int read_cook_extradata(int fd, RMContext *rmctx) {
     read_uint32be(fd, &rmctx->cook_version);
     read_uint16be(fd, &rmctx->samples_pf_pc);
@@ -273,7 +293,6 @@ int real_parse_header(int fd, RMContext *rmctx)
     uint32_t duration;
     uint32_t preroll;
     uint32_t index_offset;
-    uint32_t data_offset;
     uint16_t num_streams;
     uint16_t flags = 0;
 
@@ -331,7 +350,7 @@ int real_parse_header(int fd, RMContext *rmctx)
                 read_uint32be(fd, &duration);
                 read_uint32be(fd, &preroll);
                 read_uint32be(fd, &index_offset);
-                read_uint32be(fd, &data_offset);
+                read_uint32be(fd, &rmctx->data_offset);
                 read_uint16be(fd, &num_streams);
                 read_uint16be(fd, &rmctx->flags);
                 skipped += 40;
@@ -344,7 +363,7 @@ int real_parse_header(int fd, RMContext *rmctx)
                 printf("    duration = %d\n",duration);
                 printf("    preroll = %d\n",preroll);
                 printf("    index_offset = %d\n",index_offset);
-                printf("    data_offset = %d\n",data_offset);
+                printf("    data_offset = %d\n",rmctx->data_offset);
                 printf("    num_streams = %d\n",num_streams);
                 printf("    flags=0x%04x\n",flags);
                 break;
@@ -474,6 +493,54 @@ void rm_get_packet(int fd,RMContext *rmctx, RMPacket *pkt)
 
     //return pkt->data;
 }
+
+/**
+ * Another version of rm_get_packet which reads from a memory buffer 
+ * instead of readind from a file descriptor.
+ **/
+void rm_get_packet_membuf(uint8_t **filebuf,RMContext *rmctx, RMPacket *pkt)
+{   
+    uint8_t unknown;
+    uint16_t x, place;
+    uint16_t sps = rmctx->sub_packet_size;
+    uint16_t h = rmctx->sub_packet_h;
+    uint16_t y = rmctx->sub_packet_cnt;
+    uint16_t w = rmctx->audio_framesize;
+    do
+    {
+        y = rmctx->sub_packet_cnt;
+        pkt->version       = get_uint16be(*filebuf);
+        pkt->length        = get_uint16be(*filebuf+2);
+        pkt->stream_number = get_uint16be(*filebuf+4);
+        pkt->timestamp     = get_uint32be(*filebuf+6);
+        DEBUGF("    version = %d\n"
+               "    length  = %d\n"
+               "    stream  = %d\n"
+               "    timestamp= %d\n",pkt->version,pkt->length,pkt->stream_number,pkt->timestamp);
+
+        unknown      = get_uint8(*filebuf+10);
+        pkt->flags   = get_uint8(*filebuf+11);
+
+        if(pkt->version == 1)
+            unknown = get_uint8(*filebuf+10);
+
+        if (pkt->flags & 2) /* keyframe */
+            y = rmctx->sub_packet_cnt = 0;
+        if (!y) /* if keyframe update playback elapsed time */
+            rmctx->audiotimestamp = pkt->timestamp;
+        
+        advance_buffer(filebuf,12);
+        
+        for(x = 0 ; x < w/sps; x++)
+        {
+            place = sps*(h*x+((h+1)/2)*(y&1)+(y>>1)); 
+            pkt->frames[place/sps] = *filebuf;
+            advance_buffer(filebuf,sps);
+        }
+        rmctx->audio_pkt_cnt++;
+    }while(++(rmctx->sub_packet_cnt) < h);
+}
+
 #ifdef DEBUG
 void dump_rm_context(RMContext *rmctx)
 {
diff --git a/apps/codecs/libcook/rm.h b/apps/codecs/libcook/rm.h
index 8e2ebe8a16..bdd03f3db2 100644
--- a/apps/codecs/libcook/rm.h
+++ b/apps/codecs/libcook/rm.h
@@ -27,6 +27,7 @@
 typedef struct rm_packet
 {
     uint8_t  data[30000]; /* Reordered data. No malloc, hence the size */
+    uint8_t *frames[100]; /* Pointers to ordered audio frames in buffer */
     uint16_t version;
     uint16_t length;
     uint32_t timestamp;
@@ -44,6 +45,7 @@ typedef struct rm_context
     int audio_pkt_cnt; /* Output packet counter*/
 
     /* Stream Variables */
+    uint32_t data_offset;
     uint32_t audiotimestamp; /* Audio packet timestamp*/
     uint16_t sub_packet_cnt; /* Subpacket counter, used while reading */
     uint16_t sub_packet_size, sub_packet_h, coded_framesize; /* Descrambling parameters from container */
@@ -75,4 +77,7 @@ int open_wav(char* filename);
 void close_wav(int fd, RMContext *rmctx);
 int real_parse_header(int fd, RMContext *rmctx);
 void rm_get_packet(int fd,RMContext *rmctx, RMPacket *pkt);
+void rm_get_packet_membuf(uint8_t **filebuf,RMContext *rmctx, RMPacket *pkt);
+off_t filesize(int fd);
+void advance_buffer(uint8_t **buf, int val);
 #endif