OGG/Vorbis streams. More...
#include "asterisk.h"
#include <vorbis/codec.h>
#include <vorbis/vorbisenc.h>
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
Go to the source code of this file.
Data Structures | |
struct | vorbis_desc |
Defines | |
#define | BLOCK_SIZE 4096 |
#define | BUF_SIZE (2*SAMPLES_MAX) |
#define | SAMPLES_MAX 160 |
Functions | |
static void | __reg_module (void) |
static void | __unreg_module (void) |
static int | load_module (void) |
static void | ogg_vorbis_close (struct ast_filestream *fs) |
Close a OGG/Vorbis filestream. | |
static int | ogg_vorbis_open (struct ast_filestream *s) |
Create a new OGG/Vorbis filestream and set it up for reading. | |
static struct ast_frame * | ogg_vorbis_read (struct ast_filestream *fs, int *whennext) |
Read a frame full of audio data from the filestream. | |
static int | ogg_vorbis_rewrite (struct ast_filestream *s, const char *comment) |
Create a new OGG/Vorbis filestream and set it up for writing. | |
static int | ogg_vorbis_seek (struct ast_filestream *s, off_t sample_offset, int whence) |
Seek to a specific position in an OGG/Vorbis filestream. | |
static off_t | ogg_vorbis_tell (struct ast_filestream *s) |
static int | ogg_vorbis_trunc (struct ast_filestream *s) |
Trucate an OGG/Vorbis filestream. | |
static int | ogg_vorbis_write (struct ast_filestream *fs, struct ast_frame *f) |
Write audio data from a frame to an OGG/Vorbis filestream. | |
static int | read_samples (struct ast_filestream *fs, float ***pcm) |
Get audio data. | |
static int | unload_module (void) |
static void | write_stream (struct vorbis_desc *s, FILE *f) |
Write out any pending encoded data. | |
Variables | |
static struct ast_module_info __MODULE_INFO_SECTION | __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "OGG/Vorbis audio" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = 10, } |
static struct ast_module_info * | ast_module_info = &__mod_info |
static struct ast_format | vorbis_f |
#define BLOCK_SIZE 4096 |
Definition at line 54 of file format_ogg_vorbis.c.
Referenced by ogg_vorbis_open(), and read_samples().
#define BUF_SIZE (2*SAMPLES_MAX) |
Definition at line 52 of file format_ogg_vorbis.c.
Referenced by ogg_vorbis_read().
#define SAMPLES_MAX 160 |
Definition at line 51 of file format_ogg_vorbis.c.
Referenced by ogg_vorbis_read().
static void __reg_module | ( | void | ) | [static] |
Definition at line 563 of file format_ogg_vorbis.c.
static void __unreg_module | ( | void | ) | [static] |
Definition at line 563 of file format_ogg_vorbis.c.
static int load_module | ( | void | ) | [static] |
Definition at line 547 of file format_ogg_vorbis.c.
References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.
{ if (ast_format_register(&vorbis_f)) return AST_MODULE_LOAD_FAILURE; return AST_MODULE_LOAD_SUCCESS; }
static void ogg_vorbis_close | ( | struct ast_filestream * | fs | ) | [static] |
Close a OGG/Vorbis filestream.
fs | A OGG/Vorbis filestream. |
Definition at line 320 of file format_ogg_vorbis.c.
References ast_filestream::_private, ast_filestream::f, vorbis_desc::os, vorbis_desc::oy, s, vorbis_desc::vb, vorbis_desc::vc, vorbis_desc::vd, vorbis_desc::vi, write_stream(), and vorbis_desc::writing.
{ struct vorbis_desc *s = (struct vorbis_desc *)fs->_private; if (s->writing) { /* Tell the Vorbis encoder that the stream is finished * and write out the rest of the data */ vorbis_analysis_wrote(&s->vd, 0); write_stream(s, fs->f); } ogg_stream_clear(&s->os); vorbis_block_clear(&s->vb); vorbis_dsp_clear(&s->vd); vorbis_comment_clear(&s->vc); vorbis_info_clear(&s->vi); if (s->writing) { ogg_sync_clear(&s->oy); } }
static int ogg_vorbis_open | ( | struct ast_filestream * | s | ) | [static] |
Create a new OGG/Vorbis filestream and set it up for reading.
s | File that points to on disk storage of the OGG/Vorbis data. |
Definition at line 81 of file format_ogg_vorbis.c.
References ast_filestream::_private, ast_debug, ast_log(), BLOCK_SIZE, DEFAULT_SAMPLE_RATE, ast_filestream::f, LOG_ERROR, vorbis_desc::og, vorbis_desc::op, vorbis_desc::os, vorbis_desc::oy, vorbis_desc::vb, vorbis_desc::vc, vorbis_desc::vd, vorbis_desc::vi, and vorbis_desc::writing.
{ int i; int bytes; int result; char **ptr; char *buffer; struct vorbis_desc *tmp = (struct vorbis_desc *)s->_private; tmp->writing = 0; ogg_sync_init(&tmp->oy); buffer = ogg_sync_buffer(&tmp->oy, BLOCK_SIZE); bytes = fread(buffer, 1, BLOCK_SIZE, s->f); ogg_sync_wrote(&tmp->oy, bytes); result = ogg_sync_pageout(&tmp->oy, &tmp->og); if (result != 1) { if(bytes < BLOCK_SIZE) { ast_log(LOG_ERROR, "Run out of data...\n"); } else { ast_log(LOG_ERROR, "Input does not appear to be an Ogg bitstream.\n"); } ogg_sync_clear(&tmp->oy); return -1; } ogg_stream_init(&tmp->os, ogg_page_serialno(&tmp->og)); vorbis_info_init(&tmp->vi); vorbis_comment_init(&tmp->vc); if (ogg_stream_pagein(&tmp->os, &tmp->og) < 0) { ast_log(LOG_ERROR, "Error reading first page of Ogg bitstream data.\n"); error: ogg_stream_clear(&tmp->os); vorbis_comment_clear(&tmp->vc); vorbis_info_clear(&tmp->vi); ogg_sync_clear(&tmp->oy); return -1; } if (ogg_stream_packetout(&tmp->os, &tmp->op) != 1) { ast_log(LOG_ERROR, "Error reading initial header packet.\n"); goto error; } if (vorbis_synthesis_headerin(&tmp->vi, &tmp->vc, &tmp->op) < 0) { ast_log(LOG_ERROR, "This Ogg bitstream does not contain Vorbis audio data.\n"); goto error; } for (i = 0; i < 2 ; ) { while (i < 2) { result = ogg_sync_pageout(&tmp->oy, &tmp->og); if (result == 0) break; if (result == 1) { ogg_stream_pagein(&tmp->os, &tmp->og); while(i < 2) { result = ogg_stream_packetout(&tmp->os,&tmp->op); if(result == 0) break; if(result < 0) { ast_log(LOG_ERROR, "Corrupt secondary header. Exiting.\n"); goto error; } vorbis_synthesis_headerin(&tmp->vi, &tmp->vc, &tmp->op); i++; } } } buffer = ogg_sync_buffer(&tmp->oy, BLOCK_SIZE); bytes = fread(buffer, 1, BLOCK_SIZE, s->f); if (bytes == 0 && i < 2) { ast_log(LOG_ERROR, "End of file before finding all Vorbis headers!\n"); goto error; } ogg_sync_wrote(&tmp->oy, bytes); } for (ptr = tmp->vc.user_comments; *ptr; ptr++) ast_debug(1, "OGG/Vorbis comment: %s\n", *ptr); ast_debug(1, "OGG/Vorbis bitstream is %d channel, %ldHz\n", tmp->vi.channels, tmp->vi.rate); ast_debug(1, "OGG/Vorbis file encoded by: %s\n", tmp->vc.vendor); if (tmp->vi.channels != 1) { ast_log(LOG_ERROR, "Only monophonic OGG/Vorbis files are currently supported!\n"); goto error; } if (tmp->vi.rate != DEFAULT_SAMPLE_RATE) { ast_log(LOG_ERROR, "Only 8000Hz OGG/Vorbis files are currently supported!\n"); vorbis_block_clear(&tmp->vb); vorbis_dsp_clear(&tmp->vd); goto error; } vorbis_synthesis_init(&tmp->vd, &tmp->vi); vorbis_block_init(&tmp->vd, &tmp->vb); return 0; }
static struct ast_frame* ogg_vorbis_read | ( | struct ast_filestream * | fs, |
int * | whennext | ||
) | [static, read] |
Read a frame full of audio data from the filestream.
fs | The filestream. |
whennext | Number of sample times to schedule the next call. |
Definition at line 427 of file format_ogg_vorbis.c.
References ast_filestream::_private, AST_FORMAT_SLINEAR, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, buf, BUF_SIZE, ast_frame::data, ast_frame::datalen, ast_filestream::fr, ast_frame::frametype, len(), LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, read_samples(), s, ast_frame::samples, SAMPLES_MAX, ast_frame::subclass, val, vorbis_desc::vd, and vorbis_desc::vi.
{ int clipflag = 0; int i; int j; double accumulator[SAMPLES_MAX]; int val; int samples_in; int samples_out = 0; struct vorbis_desc *s = (struct vorbis_desc *)fs->_private; short *buf; /* SLIN data buffer */ fs->fr.frametype = AST_FRAME_VOICE; fs->fr.subclass = AST_FORMAT_SLINEAR; fs->fr.mallocd = 0; AST_FRAME_SET_BUFFER(&fs->fr, fs->buf, AST_FRIENDLY_OFFSET, BUF_SIZE); buf = (short *)(fs->fr.data.ptr); /* SLIN data buffer */ while (samples_out != SAMPLES_MAX) { float **pcm; int len = SAMPLES_MAX - samples_out; /* See ifVorbis decoder has some audio data for us ... */ samples_in = read_samples(fs, &pcm); if (samples_in <= 0) break; /* Got some audio data from Vorbis... */ /* Convert the float audio data to 16-bit signed linear */ clipflag = 0; if (samples_in > len) samples_in = len; for (j = 0; j < samples_in; j++) accumulator[j] = 0.0; for (i = 0; i < s->vi.channels; i++) { float *mono = pcm[i]; for (j = 0; j < samples_in; j++) accumulator[j] += mono[j]; } for (j = 0; j < samples_in; j++) { val = accumulator[j] * 32767.0 / s->vi.channels; if (val > 32767) { val = 32767; clipflag = 1; } else if (val < -32768) { val = -32768; clipflag = 1; } buf[samples_out + j] = val; } if (clipflag) ast_log(LOG_WARNING, "Clipping in frame %ld\n", (long) (s->vd.sequence)); /* Tell the Vorbis decoder how many samples we actually used. */ vorbis_synthesis_read(&s->vd, samples_in); samples_out += samples_in; } if (samples_out > 0) { fs->fr.datalen = samples_out * 2; fs->fr.samples = samples_out; *whennext = samples_out; return &fs->fr; } else { return NULL; } }
static int ogg_vorbis_rewrite | ( | struct ast_filestream * | s, |
const char * | comment | ||
) | [static] |
Create a new OGG/Vorbis filestream and set it up for writing.
s | File pointer that points to on-disk storage. |
comment | Comment that should be embedded in the OGG/Vorbis file. |
Definition at line 192 of file format_ogg_vorbis.c.
References ast_filestream::_private, ast_log(), ast_random(), DEFAULT_SAMPLE_RATE, vorbis_desc::eos, errno, ast_filestream::f, fwrite, LOG_ERROR, LOG_WARNING, vorbis_desc::og, vorbis_desc::os, vorbis_desc::vb, vorbis_desc::vc, vorbis_desc::vd, vorbis_desc::vi, and vorbis_desc::writing.
{ ogg_packet header; ogg_packet header_comm; ogg_packet header_code; struct vorbis_desc *tmp = (struct vorbis_desc *)s->_private; tmp->writing = 1; vorbis_info_init(&tmp->vi); if (vorbis_encode_init_vbr(&tmp->vi, 1, DEFAULT_SAMPLE_RATE, 0.4)) { ast_log(LOG_ERROR, "Unable to initialize Vorbis encoder!\n"); return -1; } vorbis_comment_init(&tmp->vc); vorbis_comment_add_tag(&tmp->vc, "ENCODER", "Asterisk PBX"); if (comment) vorbis_comment_add_tag(&tmp->vc, "COMMENT", (char *) comment); vorbis_analysis_init(&tmp->vd, &tmp->vi); vorbis_block_init(&tmp->vd, &tmp->vb); ogg_stream_init(&tmp->os, ast_random()); vorbis_analysis_headerout(&tmp->vd, &tmp->vc, &header, &header_comm, &header_code); ogg_stream_packetin(&tmp->os, &header); ogg_stream_packetin(&tmp->os, &header_comm); ogg_stream_packetin(&tmp->os, &header_code); while (!tmp->eos) { if (ogg_stream_flush(&tmp->os, &tmp->og) == 0) break; if (!fwrite(tmp->og.header, 1, tmp->og.header_len, s->f)) { ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); } if (!fwrite(tmp->og.body, 1, tmp->og.body_len, s->f)) { ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); } if (ogg_page_eos(&tmp->og)) tmp->eos = 1; } return 0; }
static int ogg_vorbis_seek | ( | struct ast_filestream * | s, |
off_t | sample_offset, | ||
int | whence | ||
) | [static] |
Seek to a specific position in an OGG/Vorbis filestream.
s | The filestream to truncate. |
sample_offset | New position for the filestream, measured in 8KHz samples. |
whence | Location to measure |
Definition at line 519 of file format_ogg_vorbis.c.
References ast_log(), and LOG_WARNING.
{ ast_log(LOG_WARNING, "Seeking is not supported on OGG/Vorbis streams!\n"); return -1; }
static off_t ogg_vorbis_tell | ( | struct ast_filestream * | s | ) | [static] |
Definition at line 525 of file format_ogg_vorbis.c.
References ast_log(), and LOG_WARNING.
{ ast_log(LOG_WARNING, "Telling is not supported on OGG/Vorbis streams!\n"); return -1; }
static int ogg_vorbis_trunc | ( | struct ast_filestream * | s | ) | [static] |
Trucate an OGG/Vorbis filestream.
s | The filestream to truncate. |
Definition at line 506 of file format_ogg_vorbis.c.
References ast_log(), and LOG_WARNING.
{ ast_log(LOG_WARNING, "Truncation is not supported on OGG/Vorbis streams!\n"); return -1; }
static int ogg_vorbis_write | ( | struct ast_filestream * | fs, |
struct ast_frame * | f | ||
) | [static] |
Write audio data from a frame to an OGG/Vorbis filestream.
fs | An OGG/Vorbis filestream. |
f | A frame containing audio to be written to the filestream. |
Definition at line 278 of file format_ogg_vorbis.c.
References ast_filestream::_private, AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_log(), ast_frame::data, ast_frame::datalen, ast_filestream::f, ast_frame::frametype, LOG_ERROR, LOG_WARNING, ast_frame::ptr, s, ast_frame::samples, ast_frame::subclass, vorbis_desc::vd, write_stream(), and vorbis_desc::writing.
{ int i; float **buffer; short *data; struct vorbis_desc *s = (struct vorbis_desc *)fs->_private; if (!s->writing) { ast_log(LOG_ERROR, "This stream is not set up for writing!\n"); return -1; } if (f->frametype != AST_FRAME_VOICE) { ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); return -1; } if (f->subclass != AST_FORMAT_SLINEAR) { ast_log(LOG_WARNING, "Asked to write non-SLINEAR frame (%d)!\n", f->subclass); return -1; } if (!f->datalen) return -1; data = (short *) f->data.ptr; buffer = vorbis_analysis_buffer(&s->vd, f->samples); for (i = 0; i < f->samples; i++) buffer[0][i] = (double)data[i] / 32768.0; vorbis_analysis_wrote(&s->vd, f->samples); write_stream(s, fs->f); return 0; }
static int read_samples | ( | struct ast_filestream * | fs, |
float *** | pcm | ||
) | [static] |
Get audio data.
fs | An OGG/Vorbis filestream. |
pcm | Pointer to a buffere to store audio data in. |
Definition at line 348 of file format_ogg_vorbis.c.
References ast_filestream::_private, ast_log(), BLOCK_SIZE, vorbis_desc::eos, ast_filestream::f, LOG_WARNING, vorbis_desc::og, vorbis_desc::op, vorbis_desc::os, vorbis_desc::oy, s, vorbis_desc::vb, and vorbis_desc::vd.
Referenced by ogg_vorbis_read().
{ int samples_in; int result; char *buffer; int bytes; struct vorbis_desc *s = (struct vorbis_desc *)fs->_private; while (1) { samples_in = vorbis_synthesis_pcmout(&s->vd, pcm); if (samples_in > 0) { return samples_in; } /* The Vorbis decoder needs more data... */ /* See ifOGG has any packets in the current page for the Vorbis decoder. */ result = ogg_stream_packetout(&s->os, &s->op); if (result > 0) { /* Yes OGG had some more packets for the Vorbis decoder. */ if (vorbis_synthesis(&s->vb, &s->op) == 0) { vorbis_synthesis_blockin(&s->vd, &s->vb); } continue; } if (result < 0) ast_log(LOG_WARNING, "Corrupt or missing data at this page position; continuing...\n"); /* No more packets left in the current page... */ if (s->eos) { /* No more pages left in the stream */ return -1; } while (!s->eos) { /* See ifOGG has any pages in it's internal buffers */ result = ogg_sync_pageout(&s->oy, &s->og); if (result > 0) { /* Yes, OGG has more pages in it's internal buffers, add the page to the stream state */ result = ogg_stream_pagein(&s->os, &s->og); if (result == 0) { /* Yes, got a new,valid page */ if (ogg_page_eos(&s->og)) { s->eos = 1; } break; } ast_log(LOG_WARNING, "Invalid page in the bitstream; continuing...\n"); } if (result < 0) ast_log(LOG_WARNING, "Corrupt or missing data in bitstream; continuing...\n"); /* No, we need to read more data from the file descrptor */ /* get a buffer from OGG to read the data into */ buffer = ogg_sync_buffer(&s->oy, BLOCK_SIZE); /* read more data from the file descriptor */ bytes = fread(buffer, 1, BLOCK_SIZE, fs->f); /* Tell OGG how many bytes we actually read into the buffer */ ogg_sync_wrote(&s->oy, bytes); if (bytes == 0) { s->eos = 1; } } } }
static int unload_module | ( | void | ) | [static] |
Definition at line 554 of file format_ogg_vorbis.c.
References ast_format_unregister(), and ast_format::name.
{ return ast_format_unregister(vorbis_f.name); }
static void write_stream | ( | struct vorbis_desc * | s, |
FILE * | f | ||
) | [static] |
Write out any pending encoded data.
s | An OGG/Vorbis filestream. |
f | The file to write to. |
Definition at line 246 of file format_ogg_vorbis.c.
References ast_log(), vorbis_desc::eos, errno, fwrite, LOG_WARNING, vorbis_desc::og, vorbis_desc::op, vorbis_desc::os, vorbis_desc::vb, and vorbis_desc::vd.
Referenced by ogg_vorbis_close(), and ogg_vorbis_write().
{ while (vorbis_analysis_blockout(&s->vd, &s->vb) == 1) { vorbis_analysis(&s->vb, NULL); vorbis_bitrate_addblock(&s->vb); while (vorbis_bitrate_flushpacket(&s->vd, &s->op)) { ogg_stream_packetin(&s->os, &s->op); while (!s->eos) { if (ogg_stream_pageout(&s->os, &s->og) == 0) { break; } if (!fwrite(s->og.header, 1, s->og.header_len, f)) { ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); } if (!fwrite(s->og.body, 1, s->og.body_len, f)) { ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); } if (ogg_page_eos(&s->og)) { s->eos = 1; } } } } }
struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "OGG/Vorbis audio" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = 10, } [static] |
Definition at line 563 of file format_ogg_vorbis.c.
struct ast_module_info* ast_module_info = &__mod_info [static] |
Definition at line 563 of file format_ogg_vorbis.c.
struct ast_format vorbis_f [static] |
Definition at line 531 of file format_ogg_vorbis.c.