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

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)