First attempt at codecflac.c

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6597 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 219 insertions, 0 deletions

diff --git a/apps/plugins/codecflac.c b/apps/plugins/codecflac.c
new file mode 100644
index 0000000000..f17be3560a
--- /dev/null
+++ b/apps/plugins/codecflac.c
@@ -0,0 +1,219 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 Björn Stenberg
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#include "plugin.h"
+
+#include <codecs/libFLAC/include/FLAC/seekable_stream_decoder.h>
+#include "playback.h"
+#include "lib/codeclib.h"
+
+#define FLAC_MAX_SUPPORTED_BLOCKSIZE 4608
+#define FLAC_MAX_SUPPORTED_CHANNELS  2
+
+static struct plugin_api* rb;
+
+/* Called when the FLAC decoder needs some FLAC data to decode */
+FLAC__SeekableStreamDecoderReadStatus flac_read_handler(const FLAC__SeekableStreamDecoder *dec, 
+                                                        FLAC__byte buffer[], unsigned *bytes, void *data)
+{   struct codec_api* ci = (struct codec_api*)data;
+    (void)dec;
+
+    *bytes=(unsigned)(ci->read_filebuf(buffer,*bytes));
+
+    /* QUESTION: How do I detect the end of the stream? */
+    if (ci->curpos >= ci->filesize) {
+      return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
+    }
+
+    return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
+}
+
+static unsigned char pcmbuf[FLAC_MAX_SUPPORTED_BLOCKSIZE*FLAC_MAX_SUPPORTED_CHANNELS*2] IDATA_ATTR;
+
+/* Called when the FLAC decoder has some decoded PCM data to write */
+FLAC__StreamDecoderWriteStatus flac_write_handler(const FLAC__SeekableStreamDecoder *dec, 
+  					          const FLAC__Frame *frame, 
+					          const FLAC__int32 * const buf[], 
+					          void *data)
+{
+   struct codec_api* ci = (struct codec_api*)data;
+   (void)dec;
+   unsigned int c_samp, c_chan, d_samp;
+   uint32_t data_size = frame->header.blocksize * frame->header.channels * 2; /* Assume 16-bit words */
+   uint32_t samples = frame->header.blocksize;
+
+
+   if (samples*frame->header.channels > (FLAC_MAX_SUPPORTED_BLOCKSIZE*FLAC_MAX_SUPPORTED_CHANNELS)) {
+     // ERROR!!!
+     DEBUGF("ERROR: samples*frame->header.channels=%d\n",samples*frame->header.channels);
+     return(FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE);
+   }
+
+   (void)dec;
+   for(c_samp = d_samp = 0; c_samp < samples; c_samp++) {
+     for(c_chan = 0; c_chan < frame->header.channels; c_chan++, d_samp++) {
+       pcmbuf[d_samp*2] = (buf[c_chan][c_samp]&0xff00)>>8;
+       pcmbuf[(d_samp*2)+1] = buf[c_chan][c_samp]&0xff;
+     }
+   } 
+
+   while (!ci->audiobuffer_insert(pcmbuf, data_size))
+     rb->yield();
+
+   return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
+}
+
+void flac_metadata_handler(const FLAC__SeekableStreamDecoder *dec, 
+                           const FLAC__StreamMetadata *meta, void *data)
+{
+  /* Ignore metadata for now... */
+  (void)dec;
+  (void)meta;
+  (void)data;
+}
+
+
+void flac_error_handler(const FLAC__SeekableStreamDecoder *dec, 
+                        FLAC__StreamDecoderErrorStatus status, void *data)
+{
+    (void)dec;
+    (void)status;
+    (void)data;
+}
+
+FLAC__SeekableStreamDecoderSeekStatus flac_seek_handler (const FLAC__SeekableStreamDecoder *decoder, 
+                                                         FLAC__uint64 absolute_byte_offset,
+                                                         void *client_data)
+{
+  (void)decoder;
+  struct codec_api* ci = (struct codec_api*)client_data;
+
+  if (ci->seek_buffer(absolute_byte_offset)) {
+    return(FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK);
+  } else {
+    return(FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR);
+  }
+}
+
+FLAC__SeekableStreamDecoderTellStatus flac_tell_handler (const FLAC__SeekableStreamDecoder *decoder, 
+                                                         FLAC__uint64 *absolute_byte_offset, void *client_data)
+{ 
+  struct codec_api* ci = (struct codec_api*)client_data;
+
+  (void)decoder;
+  *absolute_byte_offset=ci->curpos;
+  return(FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK);
+}
+
+FLAC__SeekableStreamDecoderLengthStatus flac_length_handler (const FLAC__SeekableStreamDecoder *decoder, 
+                                                         FLAC__uint64 *stream_length, void *client_data)
+{
+  struct codec_api* ci = (struct codec_api*)client_data;
+
+  (void)decoder;
+  *stream_length=ci->filesize;
+  return(FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK);
+}
+
+FLAC__bool flac_eof_handler (const FLAC__SeekableStreamDecoder *decoder, 
+                             void *client_data)
+{
+  struct codec_api* ci = (struct codec_api*)client_data;
+
+  (void)decoder;
+  if (ci->curpos >= ci->filesize) {
+    return(true);
+  } else {
+    return(false);
+  }
+}
+
+#ifndef SIMULATOR
+extern char iramcopy[];
+extern char iramstart[];
+extern char iramend[];
+#endif
+
+/* this is the plugin entry point */
+enum plugin_status plugin_start(struct plugin_api* api, void* parm)
+{
+  struct codec_api* ci = (struct codec_api*)parm;
+  FLAC__SeekableStreamDecoder* flacDecoder;
+
+  /* Generic plugin initialisation */
+  TEST_PLUGIN_API(api);
+
+  /* if you are using a global api pointer, don't forget to copy it!
+     otherwise you will get lovely "I04: IllInstr" errors... :-) */
+  rb = api;
+
+#ifndef SIMULATOR
+  rb->memcpy(iramstart, iramcopy, iramend-iramstart);
+#endif
+
+  /* This function sets up the buffers and reads the file into RAM */
+
+  if (codec_init(api, ci)) {
+    return PLUGIN_ERROR;
+  }
+
+  /* Create a decoder instance */
+
+  next_track:
+  flacDecoder=FLAC__seekable_stream_decoder_new();
+
+  /* Set up the decoder and the callback functions - this must be done before init */
+
+  /* The following are required for stream_decoder and higher */
+  FLAC__seekable_stream_decoder_set_client_data(flacDecoder,ci);
+  FLAC__seekable_stream_decoder_set_write_callback(flacDecoder, flac_write_handler);
+  FLAC__seekable_stream_decoder_set_read_callback(flacDecoder, flac_read_handler);
+  FLAC__seekable_stream_decoder_set_metadata_callback(flacDecoder, flac_metadata_handler);
+  FLAC__seekable_stream_decoder_set_error_callback(flacDecoder, flac_error_handler);
+  FLAC__seekable_stream_decoder_set_metadata_respond(flacDecoder, FLAC__METADATA_TYPE_STREAMINFO);
+
+  /* The following are only for the seekable_stream_decoder */
+  FLAC__seekable_stream_decoder_set_seek_callback(flacDecoder, flac_seek_handler);
+  FLAC__seekable_stream_decoder_set_tell_callback(flacDecoder, flac_tell_handler);
+  FLAC__seekable_stream_decoder_set_length_callback(flacDecoder, flac_length_handler);
+  FLAC__seekable_stream_decoder_set_eof_callback(flacDecoder, flac_eof_handler);
+
+
+  /* QUESTION: What do we do when the init fails? */
+  if (FLAC__seekable_stream_decoder_init(flacDecoder)) {
+    return PLUGIN_ERROR;
+  }
+
+  /* The first thing to do is to parse the metadata */
+  FLAC__seekable_stream_decoder_process_until_end_of_metadata(flacDecoder);
+
+  /* The main decoder loop */
+  while (FLAC__seekable_stream_decoder_get_state(flacDecoder)!=2) {
+    rb->yield();
+    if (ci->stop_codec || ci->reload_codec) {
+      break;
+    }
+    FLAC__seekable_stream_decoder_process_single(flacDecoder);
+  }
+
+  if (ci->request_next_track())
+    goto next_track;
+
+  return PLUGIN_OK;
+}