From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001 From: Sean Bartell Date: Sat, 25 Jun 2011 21:32:25 -0400 Subject: Add codecs to librbcodec. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius Tested-by: Nils Wallménius --- lib/rbcodec/codecs/libgme/multi_buffer.h | 114 +++++++++++++++++++++++++++++++ 1 file changed, 114 insertions(+) create mode 100644 lib/rbcodec/codecs/libgme/multi_buffer.h (limited to 'lib/rbcodec/codecs/libgme/multi_buffer.h') diff --git a/lib/rbcodec/codecs/libgme/multi_buffer.h b/lib/rbcodec/codecs/libgme/multi_buffer.h new file mode 100644 index 0000000000..e5efa5a230 --- /dev/null +++ b/lib/rbcodec/codecs/libgme/multi_buffer.h @@ -0,0 +1,114 @@ +// Multi-channel sound buffer interface, stereo and effects buffers + +// Blip_Buffer 0.4.1 +#ifndef MULTI_BUFFER_H +#define MULTI_BUFFER_H + +#include "blargg_common.h" +#include "blip_buffer.h" + +// Get indexed channel, from 0 to channel count - 1 +struct channel_t { + struct Blip_Buffer* center; + struct Blip_Buffer* left; + struct Blip_Buffer* right; +}; + +enum { type_index_mask = 0xFF }; +enum { wave_type = 0x100, noise_type = 0x200, mixed_type = wave_type | noise_type }; +enum { stereo = 2 }; +enum { bufs_size = 3 }; + +// Tracked_Blip_Buffer +struct Tracked_Blip_Buffer { + struct Blip_Buffer blip; + int last_non_silence; +}; + +void Tracked_init( struct Tracked_Blip_Buffer* this ); +unsigned Tracked_non_silent( struct Tracked_Blip_Buffer* this ); +void Tracked_remove_all_samples( struct Tracked_Blip_Buffer * this ); +int Tracked_read_samples( struct Tracked_Blip_Buffer* this, blip_sample_t [], int ); +void Tracked_remove_silence( struct Tracked_Blip_Buffer* this, int ); +void Tracked_remove_samples( struct Tracked_Blip_Buffer* this, int ); +void Tracked_clear( struct Tracked_Blip_Buffer* this ); +void Tracked_end_frame( struct Tracked_Blip_Buffer* this, blip_time_t ); + +static inline delta_t unsettled( struct Blip_Buffer* this ) +{ + return this->reader_accum_ >> delta_bits; +} + +// Stereo Mixer +struct Stereo_Mixer { + struct Tracked_Blip_Buffer* bufs [3]; + int samples_read; +}; + +void Mixer_init( struct Stereo_Mixer* this ); +void Mixer_read_pairs( struct Stereo_Mixer* this, blip_sample_t out [], int count ); + +typedef struct Tracked_Blip_Buffer buf_t; + +// Multi_Buffer +struct Multi_Buffer { + unsigned channels_changed_count_; + int sample_rate_; + int length_; + int channel_count_; + int samples_per_frame_; + int const *channel_types_; + bool immediate_removal_; + + buf_t bufs [bufs_size]; + struct Stereo_Mixer mixer; + struct channel_t chan; +}; + +blargg_err_t Buffer_set_channel_count( struct Multi_Buffer* this, int n, int const* types ); + +// Buffers used for all channels +static inline struct Blip_Buffer* center( struct Multi_Buffer* this ) { return &this->bufs [2].blip; } +static inline struct Blip_Buffer* left( struct Multi_Buffer* this ) { return &this->bufs [0].blip; } +static inline struct Blip_Buffer* right( struct Multi_Buffer* this ) { return &this->bufs [1].blip; } + +// Initializes Multi_Buffer structure +void Buffer_init( struct Multi_Buffer* this ); + +blargg_err_t Buffer_set_sample_rate( struct Multi_Buffer* this, int, int msec ); +void Buffer_clock_rate( struct Multi_Buffer* this, int ); +void Buffer_bass_freq( struct Multi_Buffer* this, int ); +void Buffer_clear( struct Multi_Buffer* this ); +void Buffer_end_frame( struct Multi_Buffer* this, blip_time_t ) ICODE_ATTR; + +static inline int Buffer_length( struct Multi_Buffer* this ) +{ + return this->length_; +} + +// Count of changes to channel configuration. Incremented whenever +// a change is made to any of the Blip_Buffers for any channel. +static inline unsigned Buffer_channels_changed_count( struct Multi_Buffer* this ) +{ + return this->channels_changed_count_; +} + +static inline void Buffer_disable_immediate_removal( struct Multi_Buffer* this ) +{ + this->immediate_removal_ = false; +} + +static inline int Buffer_sample_rate( struct Multi_Buffer* this ) +{ + return this->sample_rate_; +} + +static inline int Buffer_samples_avail( struct Multi_Buffer* this ) +{ + return (Blip_samples_avail(&this->bufs [0].blip) - this->mixer.samples_read) * 2; +} + +int Buffer_read_samples( struct Multi_Buffer* this, blip_sample_t*, int ) ICODE_ATTR; +struct channel_t Buffer_channel( struct Multi_Buffer* this, int i ); + +#endif -- cgit v1.2.3