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144 lines
4.9 KiB
144 lines
4.9 KiB
15 years ago
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/* GSL - Generic Sound Layer
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* Copyright (C) 2001 Tim Janik
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GSL_DATA_HANDLE_H__
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#define __GSL_DATA_HANDLE_H__
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#include <gsl/gsldefs.h>
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#include <gsl/gslcommon.h> /* GslErrorType */
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/* --- macros --- */
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#define GSL_DATA_HANDLE_OPENED(handle) (((GslDataHandle*) (handle))->open_count > 0)
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#define GSL_DATA_HANDLE_READ_LINEAR(handle) (((GslDataHandle*) (handle))->vtable->coarse_seek != NULL)
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/* --- typedefs & structures --- */
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typedef struct {
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GslLong n_values;
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guint n_channels;
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guint bit_depth;
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} GslDataHandleSetup;
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struct _GslDataHandle
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{
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/* constant members */
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GslDataHandleFuncs *vtable;
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gchar *name;
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/* common members */
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GslMutex mutex;
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guint ref_count;
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guint open_count;
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/* opened data handle setup (open_count > 0) */
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GslDataHandleSetup setup;
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};
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struct _GslDataHandleFuncs
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{
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GslErrorType (*open) (GslDataHandle *data_handle,
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GslDataHandleSetup *setup);
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GslLong (*read) (GslDataHandle *data_handle,
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GslLong voffset, /* in values */
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GslLong n_values,
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gfloat *values);
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void (*close) (GslDataHandle *data_handle);
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void (*destroy) (GslDataHandle *data_handle);
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/* optional (for codecs) */
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GslLong (*coarse_seek) (GslDataHandle *data_handle,
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GslLong position);
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};
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/* --- standard functions --- */
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GslDataHandle* gsl_data_handle_ref (GslDataHandle *dhandle);
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void gsl_data_handle_unref (GslDataHandle *dhandle);
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GslErrorType gsl_data_handle_open (GslDataHandle *dhandle);
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void gsl_data_handle_close (GslDataHandle *dhandle);
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GslLong gsl_data_handle_length (GslDataHandle *data_handle);
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#define gsl_data_handle_n_values( dh) \
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gsl_data_handle_length (dh)
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guint gsl_data_handle_n_channels (GslDataHandle *data_handle);
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guint gsl_data_handle_bit_depth (GslDataHandle *data_handle);
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const gchar* gsl_data_handle_name (GslDataHandle *data_handle);
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GslLong gsl_data_handle_read (GslDataHandle *data_handle,
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GslLong value_offset,
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GslLong n_values,
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gfloat *values);
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GslDataHandle* gsl_data_handle_new_cut (GslDataHandle *src_handle,
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GslLong cut_offset,
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GslLong n_cut_values);
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GslDataHandle* gsl_data_handle_new_crop (GslDataHandle *src_handle,
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GslLong n_head_cut,
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GslLong n_tail_cut);
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GslDataHandle* gsl_data_handle_new_reverse (GslDataHandle *src_handle);
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GslDataHandle* gsl_data_handle_new_insert (GslDataHandle *src_handle,
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guint paste_bit_depth,
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GslLong insertion_offset,
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GslLong n_paste_values,
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const gfloat *paste_values,
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void (*free) (gpointer values));
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GslDataHandle* gsl_data_handle_new_mem (guint n_channels,
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guint bit_depth,
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GslLong n_values,
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const gfloat *values,
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void (*free) (gpointer values));
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GslDataHandle* gsl_data_handle_new_dcached (GslDataCache *dcache);
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/* cheap and inefficient, testpurpose only */
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GslDataHandle* gsl_data_handle_new_looped (GslDataHandle *src_handle,
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GslLong loop_first,
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GslLong loop_last);
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/* --- wave specific functions --- */
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typedef enum /*< skip >*/
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{
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GSL_WAVE_FORMAT_NONE,
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GSL_WAVE_FORMAT_UNSIGNED_8,
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GSL_WAVE_FORMAT_SIGNED_8,
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GSL_WAVE_FORMAT_UNSIGNED_12,
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GSL_WAVE_FORMAT_SIGNED_12,
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GSL_WAVE_FORMAT_UNSIGNED_16,
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GSL_WAVE_FORMAT_SIGNED_16,
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GSL_WAVE_FORMAT_FLOAT,
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GSL_WAVE_FORMAT_LAST
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} GslWaveFormatType;
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const gchar* gsl_wave_format_to_string (GslWaveFormatType format);
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GslWaveFormatType gsl_wave_format_from_string (const gchar *string);
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GslDataHandle* gsl_wave_handle_new (const gchar *file_name,
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guint n_channels,
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GslWaveFormatType format,
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guint byte_order,
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GslLong byte_offset,
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GslLong n_values);
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/* --- auxillary functions --- */
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gboolean gsl_data_handle_common_init (GslDataHandle *dhandle,
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const gchar *file_name);
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void gsl_data_handle_common_free (GslDataHandle *dhandle);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GSL_DATA_HANDLE_H__ */
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