forked from len0rd/rockbox
a98a8ce131
High-frequency files increasingly use a block size of over 4608B, which means we need larger buffers to decode them. However, larger buffers no longer fit in IRAM on less-capable devices, hurting performance for "normal" file playback. On our slowest devices (M68K and PP-based devices), this is not worth the tradeoff as they will likely not have enough CPU oomph to decode and downmix these files in realtime. S5L87xx-based devices have the raw performance to do this, so we decided to err on the side of wider file compatibility at the cost of some performance. All other devices are unaffected. Change-Id: I7344cf4c8c6b7b5c14f1ea67381160665d6ece5b
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/**
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* @file bitstream.h
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* bitstream api header.
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*/
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#ifndef BITSTREAM_H
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#define BITSTREAM_H
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#include <inttypes.h>
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#include "ffmpeg_get_bits.h"
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#ifndef BUILD_STANDALONE
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#include "platform.h"
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#else
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#include <stdio.h>
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#define IBSS_ATTR
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#define ICONST_ATTR
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#define ICODE_ATTR
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#endif
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#if (CONFIG_CPU == MCF5250) || (CONFIG_CPU == PP5022) || \
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(CONFIG_CPU == PP5024)
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#define ICODE_ATTR_FLAC ICODE_ATTR
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#define IBSS_ATTR_FLAC IBSS_ATTR
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/* Enough IRAM to move additional data to it. */
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#define IBSS_ATTR_FLAC_LARGE_IRAM IBSS_ATTR
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#define IBSS_ATTR_FLAC_XLARGE_IRAM
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#define IBSS_ATTR_FLAC_XXLARGE_IRAM
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#else
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#define ICODE_ATTR_FLAC ICODE_ATTR
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#define IBSS_ATTR_FLAC IBSS_ATTR
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/* Not enough IRAM available. */
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#define IBSS_ATTR_FLAC_LARGE_IRAM
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#define IBSS_ATTR_FLAC_XLARGE_IRAM
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#define IBSS_ATTR_FLAC_XXLARGE_IRAM
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#endif
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#if (ARCH == ARCH_M68K) || defined(CPU_PP) || MEMORYSIZE <= 2
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#define MAX_BLOCKSIZE 4608
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#else
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#define MAX_BLOCKSIZE 8192
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#endif
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/* Endian conversion routines for standalone compilation */
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#ifdef BUILD_STANDALONE
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#ifdef BUILD_BIGENDIAN
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#define betoh32(x) (x)
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#define letoh32(x) swap32(x)
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#else
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#define letoh32(x) (x)
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#define betoh32(x) swap32(x)
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#endif
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/* Taken from rockbox/firmware/export/system.h */
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static inline unsigned short swap16(unsigned short value)
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/*
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result[15..8] = value[ 7..0];
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result[ 7..0] = value[15..8];
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*/
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{
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return (value >> 8) | (value << 8);
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}
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static inline unsigned long swap32(unsigned long value)
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/*
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result[31..24] = value[ 7.. 0];
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result[23..16] = value[15.. 8];
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result[15.. 8] = value[23..16];
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result[ 7.. 0] = value[31..24];
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*/
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{
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unsigned long hi = swap16(value >> 16);
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unsigned long lo = swap16(value & 0xffff);
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return (lo << 16) | hi;
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}
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#endif
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#endif /* BITSTREAM_H */
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