Flat, binary, ulaw PCM file format. More...
#include "asterisk.h"
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"
#include "asterisk/ulaw.h"
#include "asterisk/alaw.h"
Go to the source code of this file.
Defines | |
#define | AU_ENC_8BIT_ULAW 1 |
#define | AU_HDR_CHANNELS_OFF 5 |
#define | AU_HDR_DATA_SIZE_OFF 2 |
#define | AU_HDR_ENCODING_OFF 3 |
#define | AU_HDR_HDR_SIZE_OFF 1 |
#define | AU_HDR_MAGIC_OFF 0 |
#define | AU_HDR_SAMPLE_RATE_OFF 4 |
#define | AU_HEADER(var) uint32_t var[6] |
#define | AU_HEADER_SIZE 24 |
#define | AU_MAGIC 0x2e736e64 |
#define | BUF_SIZE 160 |
#define | htoll(b) (b) |
#define | htols(b) (b) |
#define | ltohl(b) (b) |
#define | ltohs(b) (b) |
Functions | |
static void | __reg_module (void) |
static void | __unreg_module (void) |
static int | au_open (struct ast_filestream *s) |
static int | au_rewrite (struct ast_filestream *s, const char *comment) |
static int | au_seek (struct ast_filestream *fs, off_t sample_offset, int whence) |
static off_t | au_tell (struct ast_filestream *fs) |
static int | au_trunc (struct ast_filestream *fs) |
static int | check_header (FILE *f) |
static int | load_module (void) |
static struct ast_frame * | pcm_read (struct ast_filestream *s, int *whennext) |
static int | pcm_seek (struct ast_filestream *fs, off_t sample_offset, int whence) |
static off_t | pcm_tell (struct ast_filestream *fs) |
static int | pcm_trunc (struct ast_filestream *fs) |
static int | pcm_write (struct ast_filestream *fs, struct ast_frame *f) |
static int | unload_module (void) |
static int | update_header (FILE *f) |
static int | write_header (FILE *f) |
Variables | |
static struct ast_module_info __MODULE_INFO_SECTION | __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw/Sun uLaw/ALaw 8KHz (PCM,PCMA,AU), G.722 16Khz" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = 10, } |
static struct ast_format | alaw_f |
static char | alaw_silence [BUF_SIZE] |
static struct ast_module_info * | ast_module_info = &__mod_info |
static struct ast_format | au_f |
static struct ast_format | g722_f |
static struct ast_format | pcm_f |
static char | ulaw_silence [BUF_SIZE] |
Flat, binary, ulaw PCM file format.
Definition in file format_pcm.c.
#define AU_ENC_8BIT_ULAW 1 |
Definition at line 231 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HDR_CHANNELS_OFF 5 |
Definition at line 229 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HDR_DATA_SIZE_OFF 2 |
Definition at line 226 of file format_pcm.c.
Referenced by update_header(), and write_header().
#define AU_HDR_ENCODING_OFF 3 |
Definition at line 227 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HDR_HDR_SIZE_OFF 1 |
Definition at line 225 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HDR_MAGIC_OFF 0 |
Definition at line 224 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HDR_SAMPLE_RATE_OFF 4 |
Definition at line 228 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HEADER | ( | var | ) | uint32_t var[6] |
Definition at line 222 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HEADER_SIZE 24 |
Definition at line 221 of file format_pcm.c.
Referenced by au_seek(), au_tell(), check_header(), update_header(), and write_header().
#define AU_MAGIC 0x2e736e64 |
Definition at line 233 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define BUF_SIZE 160 |
Definition at line 37 of file format_pcm.c.
Referenced by pcm_read(), and pcm_seek().
#define htoll | ( | b | ) | (b) |
Definition at line 235 of file format_pcm.c.
Referenced by update_header(), and write_header().
#define htols | ( | b | ) | (b) |
Definition at line 236 of file format_pcm.c.
#define ltohl | ( | b | ) | (b) |
Definition at line 237 of file format_pcm.c.
Referenced by check_header().
#define ltohs | ( | b | ) | (b) |
Definition at line 238 of file format_pcm.c.
static void __reg_module | ( | void | ) | [static] |
Definition at line 501 of file format_pcm.c.
static void __unreg_module | ( | void | ) | [static] |
Definition at line 501 of file format_pcm.c.
static int au_open | ( | struct ast_filestream * | s | ) | [static] |
Definition at line 356 of file format_pcm.c.
References check_header(), and ast_filestream::f.
{ if (check_header(s->f) < 0) return -1; return 0; }
static int au_rewrite | ( | struct ast_filestream * | s, |
const char * | comment | ||
) | [static] |
Definition at line 363 of file format_pcm.c.
References ast_filestream::f, and write_header().
{ if (write_header(s->f)) return -1; return 0; }
static int au_seek | ( | struct ast_filestream * | fs, |
off_t | sample_offset, | ||
int | whence | ||
) | [static] |
Definition at line 371 of file format_pcm.c.
References AST_FORMAT_G722, AU_HEADER_SIZE, ast_filestream::f, ast_filestream::fmt, ast_format::format, and SEEK_FORCECUR.
{ off_t min, max, cur; long offset = 0, bytes; if (fs->fmt->format == AST_FORMAT_G722) bytes = sample_offset / 2; else bytes = sample_offset; min = AU_HEADER_SIZE; cur = ftello(fs->f); fseek(fs->f, 0, SEEK_END); max = ftello(fs->f); if (whence == SEEK_SET) offset = bytes + min; else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) offset = bytes + cur; else if (whence == SEEK_END) offset = max - bytes; if (whence != SEEK_FORCECUR) { offset = (offset > max) ? max : offset; } /* always protect the header space. */ offset = (offset < min) ? min : offset; return fseeko(fs->f, offset, SEEK_SET); }
static off_t au_tell | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 410 of file format_pcm.c.
References AU_HEADER_SIZE, and ast_filestream::f.
{ off_t offset = ftello(fs->f); return offset - AU_HEADER_SIZE; }
static int au_trunc | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 403 of file format_pcm.c.
References ast_filestream::f, and update_header().
{ if (ftruncate(fileno(fs->f), ftell(fs->f))) return -1; return update_header(fs->f); }
static int check_header | ( | FILE * | f | ) | [static] |
Definition at line 256 of file format_pcm.c.
References ast_log(), AU_ENC_8BIT_ULAW, AU_HDR_CHANNELS_OFF, AU_HDR_ENCODING_OFF, AU_HDR_HDR_SIZE_OFF, AU_HDR_MAGIC_OFF, AU_HDR_SAMPLE_RATE_OFF, AU_HEADER, AU_HEADER_SIZE, AU_MAGIC, channels, DEFAULT_SAMPLE_RATE, encoding, LOG_WARNING, and ltohl.
Referenced by au_open().
{ AU_HEADER(header); uint32_t magic; uint32_t hdr_size; uint32_t data_size; uint32_t encoding; uint32_t sample_rate; uint32_t channels; if (fread(header, 1, AU_HEADER_SIZE, f) != AU_HEADER_SIZE) { ast_log(LOG_WARNING, "Read failed (header)\n"); return -1; } magic = ltohl(header[AU_HDR_MAGIC_OFF]); if (magic != (uint32_t) AU_MAGIC) { ast_log(LOG_WARNING, "Bad magic: 0x%x\n", magic); } hdr_size = ltohl(header[AU_HDR_HDR_SIZE_OFF]); if (hdr_size < AU_HEADER_SIZE) { hdr_size = AU_HEADER_SIZE; } /* data_size = ltohl(header[AU_HDR_DATA_SIZE_OFF]); */ encoding = ltohl(header[AU_HDR_ENCODING_OFF]); if (encoding != AU_ENC_8BIT_ULAW) { ast_log(LOG_WARNING, "Unexpected format: %d. Only 8bit ULAW allowed (%d)\n", encoding, AU_ENC_8BIT_ULAW); return -1; } sample_rate = ltohl(header[AU_HDR_SAMPLE_RATE_OFF]); if (sample_rate != DEFAULT_SAMPLE_RATE) { ast_log(LOG_WARNING, "Sample rate can only be 8000 not %d\n", sample_rate); return -1; } channels = ltohl(header[AU_HDR_CHANNELS_OFF]); if (channels != 1) { ast_log(LOG_WARNING, "Not in mono: channels=%d\n", channels); return -1; } /* Skip to data */ fseek(f, 0, SEEK_END); data_size = ftell(f) - hdr_size; if (fseek(f, hdr_size, SEEK_SET) == -1 ) { ast_log(LOG_WARNING, "Failed to skip to data: %d\n", hdr_size); return -1; } return data_size; }
static int load_module | ( | void | ) | [static] |
Definition at line 471 of file format_pcm.c.
References ARRAY_LEN, ast_format_register, AST_LIN2A, AST_LIN2MU, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.
{ int i; /* XXX better init ? */ for (i = 0; i < ARRAY_LEN(ulaw_silence); i++) ulaw_silence[i] = AST_LIN2MU(0); for (i = 0; i < ARRAY_LEN(alaw_silence); i++) alaw_silence[i] = AST_LIN2A(0); if ( ast_format_register(&pcm_f) || ast_format_register(&alaw_f) || ast_format_register(&au_f) || ast_format_register(&g722_f) ) return AST_MODULE_LOAD_FAILURE; return AST_MODULE_LOAD_SUCCESS; }
static struct ast_frame* pcm_read | ( | struct ast_filestream * | s, |
int * | whennext | ||
) | [static, read] |
Definition at line 76 of file format_pcm.c.
References AST_FORMAT_G722, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fmt, ast_format::format, ast_filestream::fr, ast_frame::frametype, LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.
{ int res; /* Send a frame from the file to the appropriate channel */ s->fr.frametype = AST_FRAME_VOICE; s->fr.subclass = s->fmt->format; s->fr.mallocd = 0; AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE); if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) { if (res) ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); return NULL; } s->fr.datalen = res; if (s->fmt->format == AST_FORMAT_G722) *whennext = s->fr.samples = res * 2; else *whennext = s->fr.samples = res; return &s->fr; }
static int pcm_seek | ( | struct ast_filestream * | fs, |
off_t | sample_offset, | ||
int | whence | ||
) | [static] |
Definition at line 99 of file format_pcm.c.
References AST_FORMAT_ALAW, ast_log(), BUF_SIZE, ast_filestream::f, ast_filestream::fmt, ast_format::format, fwrite, LOG_WARNING, ast_frame::offset, SEEK_FORCECUR, and ast_frame::src.
{ off_t cur, max, offset = 0; int ret = -1; /* assume error */ cur = ftello(fs->f); fseeko(fs->f, 0, SEEK_END); max = ftello(fs->f); switch (whence) { case SEEK_SET: offset = sample_offset; break; case SEEK_END: offset = max - sample_offset; break; case SEEK_CUR: case SEEK_FORCECUR: offset = cur + sample_offset; break; default: ast_log(LOG_WARNING, "invalid whence %d, assuming SEEK_SET\n", whence); offset = sample_offset; } if (offset < 0) { ast_log(LOG_WARNING, "negative offset %ld, resetting to 0\n", (long) offset); offset = 0; } if (whence == SEEK_FORCECUR && offset > max) { /* extend the file */ size_t left = offset - max; const char *src = (fs->fmt->format == AST_FORMAT_ALAW) ? alaw_silence : ulaw_silence; while (left) { size_t written = fwrite(src, 1, (left > BUF_SIZE) ? BUF_SIZE : left, fs->f); if (written == -1) break; /* error */ left -= written; } ret = 0; /* successful */ } else { if (offset > max) { ast_log(LOG_WARNING, "offset too large %ld, truncating to %ld\n", (long) offset, (long) max); offset = max; } ret = fseeko(fs->f, offset, SEEK_SET); } return ret; }
static off_t pcm_tell | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 153 of file format_pcm.c.
References ast_filestream::f.
{ return ftello(fs->f); }
static int pcm_trunc | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 148 of file format_pcm.c.
References ast_filestream::f.
static int pcm_write | ( | struct ast_filestream * | fs, |
struct ast_frame * | f | ||
) | [static] |
Definition at line 158 of file format_pcm.c.
References ast_filestream::_private, AST_FORMAT_ALAW, AST_FRAME_VOICE, ast_log(), buf, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fmt, ast_format::format, ast_frame::frametype, fwrite, LOG_WARNING, pd, ast_frame::ptr, and ast_frame::subclass.
{ int res; if (f->frametype != AST_FRAME_VOICE) { ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); return -1; } if (f->subclass != fs->fmt->format) { ast_log(LOG_WARNING, "Asked to write incompatible format frame (%d)!\n", f->subclass); return -1; } #ifdef REALTIME_WRITE if (s->fmt->format == AST_FORMAT_ALAW) { struct pcm_desc *pd = (struct pcm_desc *)fs->_private; struct stat stat_buf; unsigned long cur_time = get_time(); unsigned long fpos = ( cur_time - pd->start_time ) * 8; /* 8 bytes per msec */ /* Check if we have written to this position yet. If we have, then increment pos by one frame * for some degree of protection against receiving packets in the same clock tick. */ fstat(fileno(fs->f), &stat_buf ); if (stat_buf.st_size > fpos ) fpos += f->datalen; /* Incrementing with the size of this current frame */ if (stat_buf.st_size < fpos) { /* fill the gap with 0x55 rather than 0. */ char buf[1024]; unsigned long cur, to_write; cur = stat_buf.st_size; if (fseek(fs->f, cur, SEEK_SET) < 0) { ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) ); return -1; } memset(buf, 0x55, 512); while (cur < fpos) { to_write = fpos - cur; if (to_write > sizeof(buf)) to_write = sizeof(buf); fwrite(buf, 1, to_write, fs->f); cur += to_write; } } if (fseek(s->f, fpos, SEEK_SET) < 0) { ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) ); return -1; } } #endif /* REALTIME_WRITE */ if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) { ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno)); return -1; } return 0; }
static int unload_module | ( | void | ) | [static] |
Definition at line 489 of file format_pcm.c.
References ast_format_unregister(), and ast_format::name.
{ return ast_format_unregister(pcm_f.name) || ast_format_unregister(alaw_f.name) || ast_format_unregister(au_f.name) || ast_format_unregister(g722_f.name); }
static int update_header | ( | FILE * | f | ) | [static] |
Definition at line 304 of file format_pcm.c.
References ast_log(), AU_HDR_DATA_SIZE_OFF, AU_HEADER_SIZE, fwrite, htoll, and LOG_WARNING.
Referenced by au_trunc().
{ off_t cur, end; uint32_t datalen; int bytes; cur = ftell(f); fseek(f, 0, SEEK_END); end = ftell(f); /* data starts 24 bytes in */ bytes = end - AU_HEADER_SIZE; datalen = htoll(bytes); if (cur < 0) { ast_log(LOG_WARNING, "Unable to find our position\n"); return -1; } if (fseek(f, AU_HDR_DATA_SIZE_OFF * sizeof(uint32_t), SEEK_SET)) { ast_log(LOG_WARNING, "Unable to set our position\n"); return -1; } if (fwrite(&datalen, 1, sizeof(datalen), f) != sizeof(datalen)) { ast_log(LOG_WARNING, "Unable to set write file size\n"); return -1; } if (fseek(f, cur, SEEK_SET)) { ast_log(LOG_WARNING, "Unable to return to position\n"); return -1; } return 0; }
static int write_header | ( | FILE * | f | ) | [static] |
Definition at line 336 of file format_pcm.c.
References ast_log(), AU_ENC_8BIT_ULAW, AU_HDR_CHANNELS_OFF, AU_HDR_DATA_SIZE_OFF, AU_HDR_ENCODING_OFF, AU_HDR_HDR_SIZE_OFF, AU_HDR_MAGIC_OFF, AU_HDR_SAMPLE_RATE_OFF, AU_HEADER, AU_HEADER_SIZE, AU_MAGIC, DEFAULT_SAMPLE_RATE, fwrite, htoll, and LOG_WARNING.
Referenced by au_rewrite().
{ AU_HEADER(header); header[AU_HDR_MAGIC_OFF] = htoll((uint32_t) AU_MAGIC); header[AU_HDR_HDR_SIZE_OFF] = htoll(AU_HEADER_SIZE); header[AU_HDR_DATA_SIZE_OFF] = 0; header[AU_HDR_ENCODING_OFF] = htoll(AU_ENC_8BIT_ULAW); header[AU_HDR_SAMPLE_RATE_OFF] = htoll(DEFAULT_SAMPLE_RATE); header[AU_HDR_CHANNELS_OFF] = htoll(1); /* Write an au header, ignoring sizes which will be filled in later */ fseek(f, 0, SEEK_SET); if (fwrite(header, 1, AU_HEADER_SIZE, f) != AU_HEADER_SIZE) { ast_log(LOG_WARNING, "Unable to write header\n"); return -1; } return 0; }
struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw/Sun uLaw/ALaw 8KHz (PCM,PCMA,AU), G.722 16Khz" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = 10, } [static] |
Definition at line 501 of file format_pcm.c.
struct ast_format alaw_f [static] |
Definition at line 416 of file format_pcm.c.
char alaw_silence[BUF_SIZE] [static] |
Definition at line 40 of file format_pcm.c.
struct ast_module_info* ast_module_info = &__mod_info [static] |
Definition at line 501 of file format_pcm.c.
struct ast_format au_f [static] |
Definition at line 457 of file format_pcm.c.
struct ast_format g722_f [static] |
Definition at line 445 of file format_pcm.c.
struct ast_format pcm_f [static] |
Definition at line 433 of file format_pcm.c.
char ulaw_silence[BUF_SIZE] [static] |
Definition at line 39 of file format_pcm.c.