diff options
Diffstat (limited to 'trunk/formats/format_wav.c')
-rw-r--r-- | trunk/formats/format_wav.c | 491 |
1 files changed, 491 insertions, 0 deletions
diff --git a/trunk/formats/format_wav.c b/trunk/formats/format_wav.c new file mode 100644 index 000000000..2a40dedbd --- /dev/null +++ b/trunk/formats/format_wav.c @@ -0,0 +1,491 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Copyright (C) 1999 - 2005, Digium, Inc. + * + * Mark Spencer <markster@digium.com> + * + * See http://www.asterisk.org for more information about + * the Asterisk project. Please do not directly contact + * any of the maintainers of this project for assistance; + * the project provides a web site, mailing lists and IRC + * channels for your use. + * + * This program is free software, distributed under the terms of + * the GNU General Public License Version 2. See the LICENSE file + * at the top of the source tree. + */ + +/*! \file + * + * \brief Work with WAV in the proprietary Microsoft format. + * Microsoft WAV format (8000hz Signed Linear) + * \arg File name extension: wav (lower case) + * \ingroup formats + */ + +#include "asterisk.h" + +ASTERISK_FILE_VERSION(__FILE__, "$Revision$") + +#include "asterisk/mod_format.h" +#include "asterisk/module.h" +#include "asterisk/endian.h" + +/* Some Ideas for this code came from makewave.c by Jeffrey Chilton */ + +/* Portions of the conversion code are by guido@sienanet.it */ + +#define WAV_BUF_SIZE 320 + +struct wav_desc { /* format-specific parameters */ + int bytes; + int lasttimeout; + int maxlen; + struct timeval last; +}; + +#define BLOCKSIZE 160 + +#if __BYTE_ORDER == __LITTLE_ENDIAN +#define htoll(b) (b) +#define htols(b) (b) +#define ltohl(b) (b) +#define ltohs(b) (b) +#else +#if __BYTE_ORDER == __BIG_ENDIAN +#define htoll(b) \ + (((((b) ) & 0xFF) << 24) | \ + ((((b) >> 8) & 0xFF) << 16) | \ + ((((b) >> 16) & 0xFF) << 8) | \ + ((((b) >> 24) & 0xFF) )) +#define htols(b) \ + (((((b) ) & 0xFF) << 8) | \ + ((((b) >> 8) & 0xFF) )) +#define ltohl(b) htoll(b) +#define ltohs(b) htols(b) +#else +#error "Endianess not defined" +#endif +#endif + + +static int check_header(FILE *f) +{ + int type, size, formtype; + int fmt, hsize; + short format, chans, bysam, bisam; + int bysec; + int freq; + int data; + if (fread(&type, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Read failed (type)\n"); + return -1; + } + if (fread(&size, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Read failed (size)\n"); + return -1; + } + size = ltohl(size); + if (fread(&formtype, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Read failed (formtype)\n"); + return -1; + } + if (memcmp(&type, "RIFF", 4)) { + ast_log(LOG_WARNING, "Does not begin with RIFF\n"); + return -1; + } + if (memcmp(&formtype, "WAVE", 4)) { + ast_log(LOG_WARNING, "Does not contain WAVE\n"); + return -1; + } + if (fread(&fmt, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Read failed (fmt)\n"); + return -1; + } + if (memcmp(&fmt, "fmt ", 4)) { + ast_log(LOG_WARNING, "Does not say fmt\n"); + return -1; + } + if (fread(&hsize, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Read failed (formtype)\n"); + return -1; + } + if (ltohl(hsize) < 16) { + ast_log(LOG_WARNING, "Unexpected header size %d\n", ltohl(hsize)); + return -1; + } + if (fread(&format, 1, 2, f) != 2) { + ast_log(LOG_WARNING, "Read failed (format)\n"); + return -1; + } + if (ltohs(format) != 1) { + ast_log(LOG_WARNING, "Not a wav file %d\n", ltohs(format)); + return -1; + } + if (fread(&chans, 1, 2, f) != 2) { + ast_log(LOG_WARNING, "Read failed (format)\n"); + return -1; + } + if (ltohs(chans) != 1) { + ast_log(LOG_WARNING, "Not in mono %d\n", ltohs(chans)); + return -1; + } + if (fread(&freq, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Read failed (freq)\n"); + return -1; + } + if (ltohl(freq) != DEFAULT_SAMPLE_RATE) { + ast_log(LOG_WARNING, "Unexpected freqency %d\n", ltohl(freq)); + return -1; + } + /* Ignore the byte frequency */ + if (fread(&bysec, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Read failed (BYTES_PER_SECOND)\n"); + return -1; + } + /* Check bytes per sample */ + if (fread(&bysam, 1, 2, f) != 2) { + ast_log(LOG_WARNING, "Read failed (BYTES_PER_SAMPLE)\n"); + return -1; + } + if (ltohs(bysam) != 2) { + ast_log(LOG_WARNING, "Can only handle 16bits per sample: %d\n", ltohs(bysam)); + return -1; + } + if (fread(&bisam, 1, 2, f) != 2) { + ast_log(LOG_WARNING, "Read failed (Bits Per Sample): %d\n", ltohs(bisam)); + return -1; + } + /* Skip any additional header */ + if (fseek(f,ltohl(hsize)-16,SEEK_CUR) == -1 ) { + ast_log(LOG_WARNING, "Failed to skip remaining header bytes: %d\n", ltohl(hsize)-16 ); + return -1; + } + /* Skip any facts and get the first data block */ + for(;;) + { + char buf[4]; + + /* Begin data chunk */ + if (fread(&buf, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Read failed (data)\n"); + return -1; + } + /* Data has the actual length of data in it */ + if (fread(&data, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Read failed (data)\n"); + return -1; + } + data = ltohl(data); + if(memcmp(buf, "data", 4) == 0 ) + break; + if(memcmp(buf, "fact", 4) != 0 ) { + ast_log(LOG_WARNING, "Unknown block - not fact or data\n"); + return -1; + } + if (fseek(f,data,SEEK_CUR) == -1 ) { + ast_log(LOG_WARNING, "Failed to skip fact block: %d\n", data ); + return -1; + } + } +#if 0 + curpos = lseek(fd, 0, SEEK_CUR); + truelength = lseek(fd, 0, SEEK_END); + lseek(fd, curpos, SEEK_SET); + truelength -= curpos; +#endif + return data; +} + +static int update_header(FILE *f) +{ + off_t cur,end; + int datalen,filelen,bytes; + + cur = ftello(f); + fseek(f, 0, SEEK_END); + end = ftello(f); + /* data starts 44 bytes in */ + bytes = end - 44; + datalen = htoll(bytes); + /* chunk size is bytes of data plus 36 bytes of header */ + filelen = htoll(36 + bytes); + + if (cur < 0) { + ast_log(LOG_WARNING, "Unable to find our position\n"); + return -1; + } + if (fseek(f, 4, SEEK_SET)) { + ast_log(LOG_WARNING, "Unable to set our position\n"); + return -1; + } + if (fwrite(&filelen, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Unable to set write file size\n"); + return -1; + } + if (fseek(f, 40, SEEK_SET)) { + ast_log(LOG_WARNING, "Unable to set our position\n"); + return -1; + } + if (fwrite(&datalen, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Unable to set write datalen\n"); + return -1; + } + if (fseeko(f, cur, SEEK_SET)) { + ast_log(LOG_WARNING, "Unable to return to position\n"); + return -1; + } + return 0; +} + +static int write_header(FILE *f) +{ + unsigned int hz=htoll(8000); + unsigned int bhz = htoll(16000); + unsigned int hs = htoll(16); + unsigned short fmt = htols(1); + unsigned short chans = htols(1); + unsigned short bysam = htols(2); + unsigned short bisam = htols(16); + unsigned int size = htoll(0); + /* Write a wav header, ignoring sizes which will be filled in later */ + fseek(f,0,SEEK_SET); + if (fwrite("RIFF", 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + if (fwrite(&size, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + if (fwrite("WAVEfmt ", 1, 8, f) != 8) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + if (fwrite(&hs, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + if (fwrite(&fmt, 1, 2, f) != 2) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + if (fwrite(&chans, 1, 2, f) != 2) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + if (fwrite(&hz, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + if (fwrite(&bhz, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + if (fwrite(&bysam, 1, 2, f) != 2) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + if (fwrite(&bisam, 1, 2, f) != 2) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + if (fwrite("data", 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + if (fwrite(&size, 1, 4, f) != 4) { + ast_log(LOG_WARNING, "Unable to write header\n"); + return -1; + } + return 0; +} + +static int wav_open(struct ast_filestream *s) +{ + /* We don't have any header to read or anything really, but + if we did, it would go here. We also might want to check + and be sure it's a valid file. */ + struct wav_desc *tmp = (struct wav_desc *)s->_private; + if ((tmp->maxlen = check_header(s->f)) < 0) + return -1; + return 0; +} + +static int wav_rewrite(struct ast_filestream *s, const char *comment) +{ + /* We don't have any header to read or anything really, but + if we did, it would go here. We also might want to check + and be sure it's a valid file. */ + + if (write_header(s->f)) + return -1; + return 0; +} + +static void wav_close(struct ast_filestream *s) +{ + char zero = 0; + struct wav_desc *fs = (struct wav_desc *)s->_private; + /* Pad to even length */ + if (fs->bytes & 0x1) + fwrite(&zero, 1, 1, s->f); +} + +static struct ast_frame *wav_read(struct ast_filestream *s, int *whennext) +{ + int res; + int samples; /* actual samples read */ +#if __BYTE_ORDER == __BIG_ENDIAN + int x; +#endif + short *tmp; + int bytes = WAV_BUF_SIZE; /* in bytes */ + off_t here; + /* Send a frame from the file to the appropriate channel */ + struct wav_desc *fs = (struct wav_desc *)s->_private; + + here = ftello(s->f); + if (fs->maxlen - here < bytes) /* truncate if necessary */ + bytes = fs->maxlen - here; + if (bytes < 0) + bytes = 0; +/* ast_debug(1, "here: %d, maxlen: %d, bytes: %d\n", here, s->maxlen, bytes); */ + s->fr.frametype = AST_FRAME_VOICE; + s->fr.subclass = AST_FORMAT_SLINEAR; + s->fr.mallocd = 0; + AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, bytes); + + if ( (res = fread(s->fr.data, 1, s->fr.datalen, s->f)) <= 0 ) { + if (res) + ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); + return NULL; + } + s->fr.datalen = res; + s->fr.samples = samples = res / 2; + + tmp = (short *)(s->fr.data); +#if __BYTE_ORDER == __BIG_ENDIAN + /* file format is little endian so we need to swap */ + for( x = 0; x < samples; x++) + tmp[x] = (tmp[x] << 8) | ((tmp[x] & 0xff00) >> 8); +#endif + + *whennext = samples; + return &s->fr; +} + +static int wav_write(struct ast_filestream *fs, struct ast_frame *f) +{ +#if __BYTE_ORDER == __BIG_ENDIAN + int x; + short tmp[8000], *tmpi; +#endif + struct wav_desc *s = (struct wav_desc *)fs->_private; + int res; + + 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; + +#if __BYTE_ORDER == __BIG_ENDIAN + /* swap and write */ + if (f->datalen > sizeof(tmp)) { + ast_log(LOG_WARNING, "Data length is too long\n"); + return -1; + } + tmpi = f->data; + for (x=0; x < f->datalen/2; x++) + tmp[x] = (tmpi[x] << 8) | ((tmpi[x] & 0xff00) >> 8); + + if ((res = fwrite(tmp, 1, f->datalen, fs->f)) != f->datalen ) { +#else + /* just write */ + if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen ) { +#endif + ast_log(LOG_WARNING, "Bad write (%d): %s\n", res, strerror(errno)); + return -1; + } + + s->bytes += f->datalen; + update_header(fs->f); + + return 0; + +} + +static int wav_seek(struct ast_filestream *fs, off_t sample_offset, int whence) +{ + off_t min, max, cur, offset = 0, samples; + + samples = sample_offset * 2; /* SLINEAR is 16 bits mono, so sample_offset * 2 = bytes */ + min = 44; /* wav header is 44 bytes */ + cur = ftello(fs->f); + fseeko(fs->f, 0, SEEK_END); + max = ftello(fs->f); + if (whence == SEEK_SET) + offset = samples + min; + else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) + offset = samples + cur; + else if (whence == SEEK_END) + offset = max - samples; + 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 int wav_trunc(struct ast_filestream *fs) +{ + if (ftruncate(fileno(fs->f), ftello(fs->f))) + return -1; + return update_header(fs->f); +} + +static off_t wav_tell(struct ast_filestream *fs) +{ + off_t offset; + offset = ftello(fs->f); + /* subtract header size to get samples, then divide by 2 for 16 bit samples */ + return (offset - 44)/2; +} + +static const struct ast_format wav_f = { + .name = "wav", + .exts = "wav", + .format = AST_FORMAT_SLINEAR, + .open = wav_open, + .rewrite = wav_rewrite, + .write = wav_write, + .seek = wav_seek, + .trunc = wav_trunc, + .tell = wav_tell, + .read = wav_read, + .close = wav_close, + .buf_size = WAV_BUF_SIZE + AST_FRIENDLY_OFFSET, + .desc_size = sizeof(struct wav_desc), +}; + +static int load_module(void) +{ + if (ast_format_register(&wav_f)) + return AST_MODULE_LOAD_FAILURE; + return AST_MODULE_LOAD_SUCCESS; +} + +static int unload_module(void) +{ + return ast_format_unregister(wav_f.name); +} + +AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Microsoft WAV format (8000Hz Signed Linear)"); |