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!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 |
- 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 - 18:37:41 - MarcoenHirschberg
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