Wed Feb 11 12:00:33 2009

Asterisk developer's documentation


slinfactory.h File Reference

A machine to gather up arbitrary frames and convert them to raw slinear on demand. More...

#include <stdlib.h>
#include <unistd.h>
#include <string.h>

Go to the source code of this file.

Data Structures

struct  ast_slinfactory

Defines

#define AST_SLINFACTORY_MAX_HOLD   1280

Functions

unsigned int ast_slinfactory_available (const struct ast_slinfactory *sf)
void ast_slinfactory_destroy (struct ast_slinfactory *sf)
int ast_slinfactory_feed (struct ast_slinfactory *sf, struct ast_frame *f)
void ast_slinfactory_flush (struct ast_slinfactory *sf)
void ast_slinfactory_init (struct ast_slinfactory *sf)
int ast_slinfactory_read (struct ast_slinfactory *sf, short *buf, size_t samples)


Detailed Description

A machine to gather up arbitrary frames and convert them to raw slinear on demand.

Definition in file slinfactory.h.


Define Documentation

#define AST_SLINFACTORY_MAX_HOLD   1280

Definition at line 34 of file slinfactory.h.

Referenced by ast_slinfactory_read().


Function Documentation

unsigned int ast_slinfactory_available ( const struct ast_slinfactory sf  ) 

Definition at line 156 of file slinfactory.c.

References ast_slinfactory::size.

Referenced by ast_audiohook_write_frame(), audio_audiohook_write_list(), audiohook_read_frame_both(), and audiohook_read_frame_single().

00157 {
00158    return sf->size;
00159 }

void ast_slinfactory_destroy ( struct ast_slinfactory sf  ) 

Definition at line 44 of file slinfactory.c.

References ast_frfree, AST_LIST_REMOVE_HEAD, ast_translator_free_path(), f, ast_frame::frame_list, and ast_slinfactory::trans.

Referenced by ast_audiohook_destroy().

00045 {
00046    struct ast_frame *f;
00047 
00048    if (sf->trans) {
00049       ast_translator_free_path(sf->trans);
00050       sf->trans = NULL;
00051    }
00052 
00053    while ((f = AST_LIST_REMOVE_HEAD(&sf->queue, frame_list)))
00054       ast_frfree(f);
00055 }

int ast_slinfactory_feed ( struct ast_slinfactory sf,
struct ast_frame f 
)

Definition at line 57 of file slinfactory.c.

References AST_FORMAT_SLINEAR, ast_frdup(), ast_frfree, ast_getformatname(), AST_LIST_INSERT_TAIL, AST_LIST_TRAVERSE, ast_log(), ast_translate(), ast_translator_build_path(), ast_translator_free_path(), f, ast_slinfactory::format, ast_frame::frame_list, LOG_WARNING, ast_slinfactory::size, and ast_slinfactory::trans.

Referenced by ast_audiohook_write_frame().

00058 {
00059    struct ast_frame *begin_frame = f, *duped_frame = NULL, *frame_ptr;
00060    unsigned int x;
00061 
00062    if (f->subclass != AST_FORMAT_SLINEAR) {
00063       if (sf->trans && f->subclass != sf->format) {
00064          ast_translator_free_path(sf->trans);
00065          sf->trans = NULL;
00066       }
00067 
00068       if (!sf->trans) {
00069          if ((sf->trans = ast_translator_build_path(AST_FORMAT_SLINEAR, f->subclass)) == NULL) {
00070             ast_log(LOG_WARNING, "Cannot build a path from %s to slin\n", ast_getformatname(f->subclass));
00071             return 0;
00072          } else {
00073             sf->format = f->subclass;
00074          }
00075       }
00076 
00077       if (!(begin_frame = ast_translate(sf->trans, f, 0))) 
00078          return 0;
00079       
00080       duped_frame = ast_frdup(begin_frame);
00081 
00082       ast_frfree(begin_frame);
00083 
00084       if (!duped_frame)
00085          return 0;
00086    } else {
00087       if (!(duped_frame = ast_frdup(f)))
00088          return 0;
00089    }
00090 
00091    x = 0;
00092    AST_LIST_TRAVERSE(&sf->queue, frame_ptr, frame_list)
00093       x++;
00094 
00095    AST_LIST_INSERT_TAIL(&sf->queue, duped_frame, frame_list);
00096 
00097    sf->size += duped_frame->samples;
00098 
00099    return x;
00100 }

void ast_slinfactory_flush ( struct ast_slinfactory sf  ) 

Definition at line 161 of file slinfactory.c.

References ast_frfree, AST_LIST_REMOVE_HEAD, ast_translator_free_path(), ast_frame::frame_list, ast_slinfactory::hold, ast_slinfactory::holdlen, ast_slinfactory::offset, ast_slinfactory::size, and ast_slinfactory::trans.

Referenced by ast_audiohook_write_frame().

00162 {
00163    struct ast_frame *fr = NULL;
00164 
00165    if (sf->trans) {
00166       ast_translator_free_path(sf->trans);
00167       sf->trans = NULL;
00168    }
00169 
00170    while ((fr = AST_LIST_REMOVE_HEAD(&sf->queue, frame_list)))
00171       ast_frfree(fr);
00172 
00173    sf->size = sf->holdlen = 0;
00174    sf->offset = sf->hold;
00175 
00176    return;
00177 }

void ast_slinfactory_init ( struct ast_slinfactory sf  ) 

Definition at line 38 of file slinfactory.c.

Referenced by ast_audiohook_init().

00039 {
00040    memset(sf, 0, sizeof(*sf));
00041    sf->offset = sf->hold;
00042 }

int ast_slinfactory_read ( struct ast_slinfactory sf,
short *  buf,
size_t  samples 
)

Definition at line 102 of file slinfactory.c.

References ast_frfree, AST_LIST_REMOVE_HEAD, AST_SLINFACTORY_MAX_HOLD, ast_frame::data, ast_frame::frame_list, ast_slinfactory::hold, ast_slinfactory::holdlen, ast_slinfactory::offset, offset, ast_frame::samples, and ast_slinfactory::size.

Referenced by audio_audiohook_write_list(), audiohook_read_frame_both(), and audiohook_read_frame_single().

00103 {
00104    struct ast_frame *frame_ptr;
00105    unsigned int sofar = 0, ineed, remain;
00106    short *frame_data, *offset = buf;
00107 
00108    while (sofar < samples) {
00109       ineed = samples - sofar;
00110 
00111       if (sf->holdlen) {
00112          if (sf->holdlen <= ineed) {
00113             memcpy(offset, sf->hold, sf->holdlen * sizeof(*offset));
00114             sofar += sf->holdlen;
00115             offset += sf->holdlen;
00116             sf->holdlen = 0;
00117             sf->offset = sf->hold;
00118          } else {
00119             remain = sf->holdlen - ineed;
00120             memcpy(offset, sf->offset, ineed * sizeof(*offset));
00121             sofar += ineed;
00122             sf->offset += ineed;
00123             sf->holdlen = remain;
00124          }
00125          continue;
00126       }
00127       
00128       if ((frame_ptr = AST_LIST_REMOVE_HEAD(&sf->queue, frame_list))) {
00129          frame_data = frame_ptr->data;
00130          
00131          if (frame_ptr->samples <= ineed) {
00132             memcpy(offset, frame_data, frame_ptr->samples * sizeof(*offset));
00133             sofar += frame_ptr->samples;
00134             offset += frame_ptr->samples;
00135          } else {
00136             remain = frame_ptr->samples - ineed;
00137             memcpy(offset, frame_data, ineed * sizeof(*offset));
00138             sofar += ineed;
00139             frame_data += ineed;
00140             if (remain > (AST_SLINFACTORY_MAX_HOLD - sf->holdlen)) {
00141                remain = AST_SLINFACTORY_MAX_HOLD - sf->holdlen;
00142             }
00143             memcpy(sf->hold, frame_data, remain * sizeof(*offset));
00144             sf->holdlen = remain;
00145          }
00146          ast_frfree(frame_ptr);
00147       } else {
00148          break;
00149       }
00150    }
00151 
00152    sf->size -= sofar;
00153    return sofar;
00154 }


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