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Wiki > Main > RockboxArchitecture > RockboxMemoryLayout

---+!! Rockbox Memory Layout

See also PluginMemoryLayout

This information is currently being gathered, and is certainly incomplete, if not incorrect.  Please add further details and correct mistakes!

%TOC%

---++ SWCODEC

| *Usage*  | *Start pointer*  | *Size* | 
| font buffer | mbuf | MAX_FONT_SIZE |
| dircache | audiobuf (initially) | varies | 
| DataBase | | varies | 
| DataBase search instructions | | varies | 
| playlist storage | | configurable | 
| tree storage | | configurable | 
| LastFMLog cache | scrobbler_cache | SCROBBLER_MAX_CACHE * SCROBBLER_CACHE_LEN (optional) | 
| Cuesheet buffer | | 2 * sizeof(struct cuesheet) (optional) |
| voice thumbnail buffer (.talk clips) | | MAX_THUMBNAIL_BUFSIZE | 
| voice file | audiobuf (after initialisation complete) | talk_get_bufsize() | 
| codec malloc buffer | &audiobuf[talk_get_bufsize()]| MALLOC_BUFSIZE | 
| compressed codec data (+ guard buffer) | filebuf = &audiobuf[talk_get_bufsize()+MALLOC_BUFSIZE] | as big as possible | 
| audio codec IRAM | filebuf + filebuflen | CODEC_IRAM_SIZE | 
| voice codec IRAM |  | CODEC_IRAM_SIZE (if talk_voice_required()) | 
| audio codec DRAM |  | CODEC_SIZE | 
| voice codec DRAM |  | CODEC_SIZE (if talk_voice_required()) | 
| PCM buffers/descriptors | audiobufend - (pcmbuf_size + pcmbufdesc_size + PCMBUF_MIX_CHUNK*2) | pcmbuf_size + pcmbufdesc_size | 
| PCM crossfade buffer | audiobufend - PCMBUF_MIX_CHUNK*2 | PCMBUF_MIX_CHUNK | 
| PCM voice mix buffer | audiobufend - PCMBUF_MIX_CHUNK | PCMBUF_MIX_CHUNK | 
| (end) | audiobufend | | 

Notes:
   * The allocations for dircache through to codec malloc buffer are all allocated during initialisation using buffer_alloc, hence changing the value of audiobuf.
   * In pcmbuf_init, the comment shows layout  ...CODECBUFFER|---------PCMBUF---------|GUARDBUF|DESCS|  - is this a seperate guard buffer, or a mistake?

---++ MASCODEC

(to be added)

r15 - 06 Oct 2008 - 16:37:41 - MarcoenHirschberg

Parents: RockboxArchitecture