#include "codeclib.h" CODEC_HEADER /* this is the codec entry point */ enum codec_status codec_main(void) codec_main(enum codec_entry_call_reason reason) { next_track: /* Check reason if actually doing something useful with it */ if (reason == CODEC_LOAD) { /* Codec is being loaded and initialized; do load-time inits here */ /* May include creating threads or setting DSP parameters that do not change on a per-track basis */ return CODEC_OK; /* OR return CODEC_ERROR if init fails */ } else if (reason == CODEC_UNLOAD) { /* Codec is about to be removed from memory; clean up any resouces allocated */ return CODEC_OK; /* Return value ignored */ } else { /* Default response in cases where codec has nothing to do when codec_main is called for a particular reason */ return CODEC_OK; } } /* this is called for each file to process */ enum codec_status codec_run(void) { /* param that receives data for a command */ intptr_t param; 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); /* Init Codec for Track */ /* Make use of 44.1khz */ ci->configure(DSP_SET_FREQUENCY, 44100); /* Sample depth is 16 bit little endian */ ci->configure(DSP_SET_SAMPLE_DEPTH, 16); /* Stereo or Mono output ? */ ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO); /* reset eleapsed */ ci->set_elapsed(0); /* The main decoder loop */ while (1) { ci->yield(); enum codec_command_action action = ci->get_command(¶m); if (ci->stop_codec || ci->new_track) (action == CODEC_ACTION_HALT) { /* Playback said codec should stop */ break; } if (ci->seek_time) (action == CODEC_ACTION_SEEK_TIME) { /* New time is ready in ci->seek_time param */ /* absolute position in ms */ /* seek to pos */ /* update elapsed */ ci->set_elapsed(ci->seek_time); ci->set_elapsed(param); /* seek ready */ ci->seek_complete(); } /* Generate a buffer full of Audio */ /* Insert a buffer full of samples */ ci->pcmbuf_insert(sample_buffer, NULL, numberOfSamples); /* update Update elapsed in ms */ ci->set_elapsed(current_Pos); if( EndOfFile ) break; } if (ci->request_next_track()) goto next_track; return CODEC_OK; } 

• apps/metadata.c
  • Add a case to the switch in get_metadata()
  • Add an entry or entries to audio_formats[]
  • If one codec supports multiple formats, add a case to get_audio_base_codec_type().
  • If the format is atomic audio (must be completely loaded onto the buffer), add a case to get_audio_base_data_type().
  • If file can be resumed without loading it from the beginning, add a case to format_buffers_with_offset().

• apps/metadata/ apps/metadata
  • Add your metadata detection here.