Added FS#2939 Encoder Codec Interface + Codecs by Antonius Hellmann with additional FM Recording support and my modifications

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10789 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 172 insertions, 0 deletions

diff --git a/apps/codecs/wav_enc.c b/apps/codecs/wav_enc.c
new file mode 100644
index 0000000..5aabb5d
--- /dev/null
+++ b/apps/codecs/wav_enc.c
@@ -0,0 +1,172 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 Antonius Hellmann
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef SIMULATOR
+
+#include "codeclib.h"
+
+CODEC_HEADER
+
+static struct codec_api *ci;
+static    int enc_channels;
+
+#define CHUNK_SIZE 8192
+
+static unsigned char wav_header[44] =
+{'R','I','F','F',0,0,0,0,'W','A','V','E','f','m','t',' ',16,
+ 0,0,0,1,0,2,0,0x44,0xac,0,0,0x10,0xb1,2,0,4,0,16,0,'d','a','t','a',0,0,0,0};
+
+static unsigned char wav_header_mono[44] =
+{'R','I','F','F',0,0,0,0,'W','A','V','E','f','m','t',' ',16,
+ 0,0,0,1,0,1,0,0x44,0xac,0,0,0x88,0x58,1,0,2,0,16,0,'d','a','t','a',0,0,0,0};
+
+/* update file header info callback function (called by main application)  */
+void enc_set_header(void *head_buffer,  /* ptr to the file header data     */
+                   int head_size,       /* size of this header data        */
+                   int num_pcm_samples, /* amount of processed pcm samples */
+                   bool is_file_header)
+{
+    int num_file_bytes = num_pcm_samples * 2 * enc_channels;
+
+    if(is_file_header)
+    {
+        /* update file header before file closing */
+        if((int)sizeof(wav_header) < head_size)
+        {
+            /* update wave header size entries: special to WAV format */
+            *(long*)(head_buffer+ 4) = htole32(num_file_bytes + 36);
+            *(long*)(head_buffer+40) = htole32(num_file_bytes);
+        }
+    }
+}
+
+/* main codec entry point */
+enum codec_status codec_start(struct codec_api* api)
+{
+    int            i;
+    long           lr;
+    unsigned long  t;
+    unsigned long  *src;
+    unsigned long  *dst;
+    int            chunk_size, num_chunks, samp_per_chunk;
+    int            enc_buffer_size;
+    int            enc_quality;
+    bool           cpu_boosted = true; /* start boosted */
+
+    ci = api; // copy to global api pointer
+
+    if(ci->enc_get_inputs          == NULL ||
+       ci->enc_set_parameters      == NULL ||
+       ci->enc_alloc_chunk         == NULL ||
+       ci->enc_free_chunk          == NULL ||
+       ci->enc_wavbuf_near_empty   == NULL ||
+       ci->enc_get_wav_data        == NULL ||
+       ci->enc_set_header_callback == NULL )
+        return CODEC_ERROR;
+
+    ci->cpu_boost(true);
+
+    *ci->enc_set_header_callback = enc_set_header;
+    ci->enc_get_inputs(&enc_buffer_size, &enc_channels, &enc_quality);
+
+    /* configure the buffer system */
+    chunk_size     = sizeof(long) + CHUNK_SIZE * enc_channels / 2;
+    num_chunks     = enc_buffer_size / chunk_size;
+    samp_per_chunk = CHUNK_SIZE / 4;
+
+    /* inform the main program about buffer dimensions and other params */
+    ci->enc_set_parameters(chunk_size, num_chunks, samp_per_chunk,
+        (enc_channels == 2) ? wav_header : wav_header_mono,
+        sizeof(wav_header), AFMT_PCM_WAV);
+
+    /* main application waits for this flag during encoder loading */
+    ci->enc_codec_loaded = true;
+
+    /* main encoding loop */
+    while(!ci->stop_codec)
+    {
+        while((src = (unsigned long*)ci->enc_get_wav_data(CHUNK_SIZE)) != NULL)
+        {
+            if(ci->stop_codec)
+                break;
+
+            if(ci->enc_wavbuf_near_empty() == 0)
+            {
+                if(!cpu_boosted)
+                {
+                    ci->cpu_boost(true);
+                    cpu_boosted = true;
+                }
+            }
+
+            dst = (unsigned long*)ci->enc_alloc_chunk();
+            *dst++ = CHUNK_SIZE * enc_channels / 2; /* set size info */
+
+            if(enc_channels == 2)
+            {
+                /* swap byte order & copy to destination */
+                for (i=0; i<CHUNK_SIZE/4; i++)
+                {
+                    t = *src++;
+                    *dst++ = ((t >> 8) & 0xff00ff) | ((t << 8) & 0xff00ff00);
+                }
+            }
+            else
+            {
+                /* mix left/right, swap byte order & copy to destination */
+                for (i=0; i<CHUNK_SIZE/8; i++)
+                {
+                    lr = (long)*src++;
+                    lr = (((lr<<16)>>16) + (lr>>16)) >> 1; /* left+right */
+                    t  = (lr << 16);
+                    lr = (long)*src++;
+                    lr = (((lr<<16)>>16) + (lr>>16)) >> 1; /* left+right */
+                    t |= lr & 0xffff;
+                    *dst++ = ((t >> 8) & 0xff00ff) | ((t << 8) & 0xff00ff00);
+                }
+            }
+
+            ci->enc_free_chunk();
+            ci->yield();
+        }
+
+        if(ci->enc_wavbuf_near_empty())
+        {
+            if(cpu_boosted)
+            {
+                ci->cpu_boost(false);
+                cpu_boosted = false;
+            }
+        }
+
+        ci->yield();
+    }
+
+    if(cpu_boosted) /* set initial boost state */
+        ci->cpu_boost(false);
+
+    /* reset parameters to initial state */
+    ci->enc_set_parameters(0, 0, 0, 0, 0, 0);
+ 
+    /* main application waits for this flag during encoder removing */
+    ci->enc_codec_loaded = false;
+
+    return CODEC_OK;
+}
+#endif