OGG/Vorbis streams. More...
#include "asterisk.h"
#include <vorbis/codec.h>
#include <vorbis/vorbisenc.h>
#include <vorbis/vorbisfile.h>
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
Go to the source code of this file.
Data Structures | |
struct | ogg_vorbis_desc |
Defines | |
#define | BLOCK_SIZE 4096 |
#define | BUF_SIZE (2*SAMPLES_MAX) |
#define | SAMPLES_MAX 512 |
Functions | |
static int | _ov_header_fseek_wrap (FILE *f, ogg_int64_t off, int whence) |
AST_MODULE_INFO (ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,"OGG/Vorbis audio",.load=load_module,.unload=unload_module,.load_pri=AST_MODPRI_APP_DEPEND) | |
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 *fs, 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 *fs) |
Tell the current position in OGG/Vorbis filestream measured in pcms. | |
static int | ogg_vorbis_trunc (struct ast_filestream *fs) |
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 | unload_module (void) |
static void | write_stream (struct ogg_vorbis_desc *s, FILE *f) |
Write out any pending encoded data. | |
Variables | |
static ov_callbacks | OV_CALLBACKS_NOCLOSE |
static struct ast_format | vorbis_f |
OGG/Vorbis streams.
Definition in file format_ogg_vorbis.c.
#define BLOCK_SIZE 4096 |
Definition at line 56 of file format_ogg_vorbis.c.
#define BUF_SIZE (2*SAMPLES_MAX) |
Definition at line 54 of file format_ogg_vorbis.c.
#define SAMPLES_MAX 512 |
Definition at line 53 of file format_ogg_vorbis.c.
static int _ov_header_fseek_wrap | ( | FILE * | f, | |
ogg_int64_t | off, | |||
int | whence | |||
) | [static] |
Definition at line 88 of file format_ogg_vorbis.c.
AST_MODULE_INFO | ( | ASTERISK_GPL_KEY | , | |
AST_MODFLAG_LOAD_ORDER | , | |||
"OGG/Vorbis audio" | , | |||
. | load = load_module , |
|||
. | unload = unload_module , |
|||
. | load_pri = AST_MODPRI_APP_DEPEND | |||
) |
static int load_module | ( | void | ) | [static] |
Definition at line 437 of file format_ogg_vorbis.c.
References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.
00438 { 00439 if (ast_format_register(&vorbis_f)) 00440 return AST_MODULE_LOAD_FAILURE; 00441 return AST_MODULE_LOAD_SUCCESS; 00442 }
static void ogg_vorbis_close | ( | struct ast_filestream * | fs | ) | [static] |
Close a OGG/Vorbis filestream.
fs | A OGG/Vorbis filestream. |
Definition at line 278 of file format_ogg_vorbis.c.
References ast_filestream::_private, ast_filestream::f, ogg_vorbis_desc::ov_f, ogg_vorbis_desc::vd, write_stream(), and ogg_vorbis_desc::writing.
00279 { 00280 struct ogg_vorbis_desc *s = (struct ogg_vorbis_desc *) fs->_private; 00281 00282 if (s->writing) { 00283 /* Tell the Vorbis encoder that the stream is finished 00284 * and write out the rest of the data */ 00285 vorbis_analysis_wrote(&s->vd, 0); 00286 write_stream(s, fs->f); 00287 } else { 00288 /* clear OggVorbis_File handle */ 00289 ov_clear(&s->ov_f); 00290 } 00291 }
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 109 of file format_ogg_vorbis.c.
References ast_filestream::_private, ast_log(), DEFAULT_SAMPLE_RATE, desc, ast_filestream::f, LOG_ERROR, ogg_vorbis_desc::ov_f, and ogg_vorbis_desc::writing.
00110 { 00111 int result; 00112 struct ogg_vorbis_desc *desc = (struct ogg_vorbis_desc *) s->_private; 00113 00114 /* initialize private description block */ 00115 memset(desc, 0, sizeof(struct ogg_vorbis_desc)); 00116 desc->writing = 0; 00117 00118 /* actually open file */ 00119 result = ov_open_callbacks(s->f, &desc->ov_f, NULL, 0, OV_CALLBACKS_NOCLOSE); 00120 if (result != 0) { 00121 ast_log(LOG_ERROR, "Error opening Ogg/Vorbis file stream.\n"); 00122 return -1; 00123 } 00124 00125 /* check stream(s) type */ 00126 if (desc->ov_f.vi->channels != 1) { 00127 ast_log(LOG_ERROR, "Only monophonic OGG/Vorbis files are currently supported!\n"); 00128 ov_clear(&desc->ov_f); 00129 return -1; 00130 } 00131 00132 if (desc->ov_f.vi->rate != DEFAULT_SAMPLE_RATE) { 00133 ast_log(LOG_ERROR, "Only 8000Hz OGG/Vorbis files are currently supported!\n"); 00134 ov_clear(&desc->ov_f); 00135 return -1; 00136 } 00137 00138 return 0; 00139 }
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 299 of file format_ogg_vorbis.c.
References __BIG_ENDIAN, ast_filestream::_private, AST_FORMAT_SLINEAR, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, desc, ast_filestream::fr, ast_frame::frametype, LOG_WARNING, ast_frame::mallocd, ogg_vorbis_desc::ov_f, ast_frame::ptr, ast_frame::samples, ast_frame::subclass, and ogg_vorbis_desc::writing.
00301 { 00302 struct ogg_vorbis_desc *desc = (struct ogg_vorbis_desc *) fs->_private; 00303 int current_bitstream = -10; 00304 char *out_buf; 00305 long bytes_read; 00306 00307 if (desc->writing) { 00308 ast_log(LOG_WARNING, "Reading is not suport on OGG/Vorbis on write files.\n"); 00309 return NULL; 00310 } 00311 00312 /* initialize frame */ 00313 fs->fr.frametype = AST_FRAME_VOICE; 00314 fs->fr.subclass.codec = AST_FORMAT_SLINEAR; 00315 fs->fr.mallocd = 0; 00316 AST_FRAME_SET_BUFFER(&fs->fr, fs->buf, AST_FRIENDLY_OFFSET, BUF_SIZE); 00317 out_buf = (char *) (fs->fr.data.ptr); /* SLIN data buffer */ 00318 00319 /* read samples from OV interface */ 00320 bytes_read = ov_read( 00321 &desc->ov_f, 00322 out_buf, /* Buffer to write data */ 00323 BUF_SIZE, /* Size of buffer */ 00324 (__BYTE_ORDER == __BIG_ENDIAN), /* Endianes (0 for little) */ 00325 2, /* 1 = 8bit, 2 = 16bit */ 00326 1, /* 0 = unsigned, 1 = signed */ 00327 ¤t_bitstream /* Returns the current bitstream section */ 00328 ); 00329 00330 /* check returned data */ 00331 if (bytes_read <= 0) { 00332 /* End of stream */ 00333 return NULL; 00334 } 00335 00336 /* Return decoded bytes */ 00337 fs->fr.datalen = bytes_read; 00338 fs->fr.samples = bytes_read / 2; 00339 *whennext = fs->fr.samples; 00340 return &fs->fr; 00341 }
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 147 of file format_ogg_vorbis.c.
References ast_filestream::_private, ast_log(), ast_random(), DEFAULT_SAMPLE_RATE, ogg_vorbis_desc::eos, errno, ast_filestream::f, LOG_ERROR, LOG_WARNING, ogg_vorbis_desc::og, ogg_vorbis_desc::os, ogg_vorbis_desc::vb, ogg_vorbis_desc::vc, ogg_vorbis_desc::vd, ogg_vorbis_desc::vi, ogg_vorbis_desc::writing, and ogg_vorbis_desc::writing_pcm_pos.
00149 { 00150 ogg_packet header; 00151 ogg_packet header_comm; 00152 ogg_packet header_code; 00153 struct ogg_vorbis_desc *tmp = (struct ogg_vorbis_desc *) s->_private; 00154 00155 tmp->writing = 1; 00156 tmp->writing_pcm_pos = 0; 00157 00158 vorbis_info_init(&tmp->vi); 00159 00160 if (vorbis_encode_init_vbr(&tmp->vi, 1, DEFAULT_SAMPLE_RATE, 0.4)) { 00161 ast_log(LOG_ERROR, "Unable to initialize Vorbis encoder!\n"); 00162 return -1; 00163 } 00164 00165 vorbis_comment_init(&tmp->vc); 00166 vorbis_comment_add_tag(&tmp->vc, "ENCODER", "Asterisk PBX"); 00167 if (comment) 00168 vorbis_comment_add_tag(&tmp->vc, "COMMENT", (char *) comment); 00169 00170 vorbis_analysis_init(&tmp->vd, &tmp->vi); 00171 vorbis_block_init(&tmp->vd, &tmp->vb); 00172 00173 ogg_stream_init(&tmp->os, ast_random()); 00174 00175 vorbis_analysis_headerout(&tmp->vd, &tmp->vc, &header, &header_comm, 00176 &header_code); 00177 ogg_stream_packetin(&tmp->os, &header); 00178 ogg_stream_packetin(&tmp->os, &header_comm); 00179 ogg_stream_packetin(&tmp->os, &header_code); 00180 00181 while (!tmp->eos) { 00182 if (ogg_stream_flush(&tmp->os, &tmp->og) == 0) 00183 break; 00184 if (!fwrite(tmp->og.header, 1, tmp->og.header_len, s->f)) { 00185 ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); 00186 } 00187 if (!fwrite(tmp->og.body, 1, tmp->og.body_len, s->f)) { 00188 ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); 00189 } 00190 if (ogg_page_eos(&tmp->og)) 00191 tmp->eos = 1; 00192 } 00193 00194 return 0; 00195 }
static int ogg_vorbis_seek | ( | struct ast_filestream * | fs, | |
off_t | sample_offset, | |||
int | whence | |||
) | [static] |
Seek to a specific position in an OGG/Vorbis filestream.
s | The filestream to take action on. | |
sample_offset | New position for the filestream, measured in 8KHz samples. | |
whence | Location to measure |
Definition at line 382 of file format_ogg_vorbis.c.
References ast_filestream::_private, ast_log(), desc, LOG_WARNING, ogg_vorbis_tell(), ogg_vorbis_desc::ov_f, and ogg_vorbis_desc::writing.
00383 { 00384 int seek_result = -1; 00385 off_t relative_pcm_pos; 00386 struct ogg_vorbis_desc *desc = (struct ogg_vorbis_desc *) fs->_private; 00387 00388 if (desc->writing) { 00389 ast_log(LOG_WARNING, "Seeking is not supported on OGG/Vorbis streams in writing mode!\n"); 00390 return -1; 00391 } 00392 00393 /* ov_pcm_seek support seeking only from begining (SEEK_SET), the rest must be emulated */ 00394 switch (whence) { 00395 case SEEK_SET: 00396 seek_result = ov_pcm_seek(&desc->ov_f, sample_offset); 00397 break; 00398 case SEEK_CUR: 00399 if ((relative_pcm_pos = ogg_vorbis_tell(fs)) < 0) { 00400 seek_result = -1; 00401 break; 00402 } 00403 seek_result = ov_pcm_seek(&desc->ov_f, relative_pcm_pos + sample_offset); 00404 break; 00405 case SEEK_END: 00406 if ((relative_pcm_pos = ov_pcm_total(&desc->ov_f, -1)) < 0) { 00407 seek_result = -1; 00408 break; 00409 } 00410 seek_result = ov_pcm_seek(&desc->ov_f, relative_pcm_pos - sample_offset); 00411 break; 00412 default: 00413 ast_log(LOG_WARNING, "Unknown *whence* to seek on OGG/Vorbis streams!\n"); 00414 break; 00415 } 00416 00417 /* normalize error value to -1,0 */ 00418 return (seek_result == 0) ? 0 : -1; 00419 }
static off_t ogg_vorbis_tell | ( | struct ast_filestream * | fs | ) | [static] |
Tell the current position in OGG/Vorbis filestream measured in pcms.
s | The filestream to take action on. |
Definition at line 360 of file format_ogg_vorbis.c.
References ast_filestream::_private, desc, ogg_vorbis_desc::ov_f, ogg_vorbis_desc::writing, and ogg_vorbis_desc::writing_pcm_pos.
Referenced by ogg_vorbis_seek().
00361 { 00362 off_t pos; 00363 struct ogg_vorbis_desc *desc = (struct ogg_vorbis_desc *) fs->_private; 00364 00365 if (desc->writing) { 00366 return desc->writing_pcm_pos; 00367 } 00368 00369 if ((pos = ov_pcm_tell(&desc->ov_f)) < 0) { 00370 return -1; 00371 } 00372 return pos; 00373 }
static int ogg_vorbis_trunc | ( | struct ast_filestream * | fs | ) | [static] |
Trucate an OGG/Vorbis filestream.
s | The filestream to truncate. |
Definition at line 349 of file format_ogg_vorbis.c.
References ast_log(), and LOG_WARNING.
00350 { 00351 ast_log(LOG_WARNING, "Truncation is not supported on OGG/Vorbis streams!\n"); 00352 return -1; 00353 }
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 234 of file format_ogg_vorbis.c.
References ast_filestream::_private, AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_getformatname(), ast_log(), ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, ast_filestream::f, ast_frame::frametype, LOG_ERROR, LOG_WARNING, ast_frame::ptr, ast_frame::samples, ast_frame::subclass, ogg_vorbis_desc::vd, write_stream(), ogg_vorbis_desc::writing, and ogg_vorbis_desc::writing_pcm_pos.
00235 { 00236 int i; 00237 float **buffer; 00238 short *data; 00239 struct ogg_vorbis_desc *s = (struct ogg_vorbis_desc *) fs->_private; 00240 00241 if (!s->writing) { 00242 ast_log(LOG_ERROR, "This stream is not set up for writing!\n"); 00243 return -1; 00244 } 00245 00246 if (f->frametype != AST_FRAME_VOICE) { 00247 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); 00248 return -1; 00249 } 00250 if (f->subclass.codec != AST_FORMAT_SLINEAR) { 00251 ast_log(LOG_WARNING, "Asked to write non-SLINEAR frame (%s)!\n", 00252 ast_getformatname(f->subclass.codec)); 00253 return -1; 00254 } 00255 if (!f->datalen) 00256 return -1; 00257 00258 data = (short *) f->data.ptr; 00259 00260 buffer = vorbis_analysis_buffer(&s->vd, f->samples); 00261 00262 for (i = 0; i < f->samples; i++) 00263 buffer[0][i] = (double)data[i] / 32768.0; 00264 00265 vorbis_analysis_wrote(&s->vd, f->samples); 00266 00267 write_stream(s, fs->f); 00268 00269 s->writing_pcm_pos += f->samples; 00270 00271 return 0; 00272 }
static int unload_module | ( | void | ) | [static] |
Definition at line 444 of file format_ogg_vorbis.c.
References ast_format_unregister(), and ast_format::name.
00445 { 00446 return ast_format_unregister(vorbis_f.name); 00447 }
static void write_stream | ( | struct ogg_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 202 of file format_ogg_vorbis.c.
References ast_log(), ogg_vorbis_desc::eos, errno, LOG_WARNING, ogg_vorbis_desc::og, ogg_vorbis_desc::op, ogg_vorbis_desc::os, ogg_vorbis_desc::vb, and ogg_vorbis_desc::vd.
Referenced by ogg_vorbis_close(), and ogg_vorbis_write().
00203 { 00204 while (vorbis_analysis_blockout(&s->vd, &s->vb) == 1) { 00205 vorbis_analysis(&s->vb, NULL); 00206 vorbis_bitrate_addblock(&s->vb); 00207 00208 while (vorbis_bitrate_flushpacket(&s->vd, &s->op)) { 00209 ogg_stream_packetin(&s->os, &s->op); 00210 while (!s->eos) { 00211 if (ogg_stream_pageout(&s->os, &s->og) == 0) { 00212 break; 00213 } 00214 if (!fwrite(s->og.header, 1, s->og.header_len, f)) { 00215 ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); 00216 } 00217 if (!fwrite(s->og.body, 1, s->og.body_len, f)) { 00218 ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); 00219 } 00220 if (ogg_page_eos(&s->og)) { 00221 s->eos = 1; 00222 } 00223 } 00224 } 00225 } 00226 }
ov_callbacks OV_CALLBACKS_NOCLOSE [static] |
Definition at line 96 of file format_ogg_vorbis.c.
struct ast_format vorbis_f [static] |
Definition at line 421 of file format_ogg_vorbis.c.