/* libSoX file format: Grandstream ring tone (c) 2009 robs@users.sourceforge.net * * See https://web.archive.org/web/20101128121923/http://grandstream.com/ringtone.html * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or (at * your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser * General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "sox_i.h" #include #define VERSION_ 0x1000000 #define MAX_FILE_SIZE 0x10000 #define HEADER_SIZE (size_t)512 #define PADDING_SIZE (size_t)478 static char const id[16] = "ring.bin"; typedef struct { char const * string; int ft_encoding; unsigned bits_per_sample; sox_encoding_t sox_encoding; } table_t; static table_t const table[] = { {NULL, 0, 8, SOX_ENCODING_ULAW}, {"G726", 2, 0, SOX_ENCODING_UNKNOWN}, {NULL, 3, 0, SOX_ENCODING_GSM}, {NULL, 4, 0, SOX_ENCODING_G723}, {NULL, 8, 8, SOX_ENCODING_ALAW}, {"G722", 9, 0, SOX_ENCODING_UNKNOWN}, {"G728", 15, 2, SOX_ENCODING_UNKNOWN}, {"iLBC", 98, 0, SOX_ENCODING_UNKNOWN}, }; static int ft_enc(unsigned bits_per_sample, sox_encoding_t encoding) { size_t i; for (i = 0; i < array_length(table); ++i) { table_t const * t = &table[i]; if (t->sox_encoding == encoding && t->bits_per_sample == bits_per_sample) return t->ft_encoding; } return -1; /* Should never get here. */ } static sox_encoding_t sox_enc(int ft_encoding, unsigned * bits_per_sample) { size_t i; for (i = 0; i < array_length(table); ++i) { table_t const * t = &table[i]; if (t->ft_encoding == ft_encoding) { *bits_per_sample = t->bits_per_sample; if (t->sox_encoding == SOX_ENCODING_UNKNOWN) lsx_report("unsupported encoding: %s", t->string); return t->sox_encoding; } } *bits_per_sample = 0; return SOX_ENCODING_UNKNOWN; } static int start_read(sox_format_t * ft) { off_t num_samples; char read_id[array_length(id)]; uint32_t file_size; int16_t ft_encoding; sox_encoding_t encoding; unsigned bits_per_sample; lsx_readdw(ft, &file_size); num_samples = file_size? file_size * 2 - HEADER_SIZE : SOX_UNSPEC; if (file_size >= 2 && ft->seekable) { int i, checksum = (file_size >> 16) + file_size; for (i = file_size - 2; i; --i) { int16_t int16; lsx_readsw(ft, &int16); checksum += int16; } if (lsx_seeki(ft, (off_t)sizeof(file_size), SEEK_SET) != 0) return SOX_EOF; if (checksum & 0xffff) lsx_warn("invalid checksum in input file %s", ft->filename); } lsx_skipbytes(ft, (size_t)(2 + 4 + 6)); /* Checksum, version, time stamp. */ lsx_readchars(ft, read_id, sizeof(read_id)); if (memcmp(read_id, id, strlen(id))) { lsx_fail_errno(ft, SOX_EHDR, "gsrt: invalid file name in header"); return SOX_EOF; } lsx_readsw(ft, &ft_encoding); encoding = sox_enc(ft_encoding, &bits_per_sample); if (encoding != SOX_ENCODING_ALAW && encoding != SOX_ENCODING_ULAW) ft->handler.read = NULL; lsx_skipbytes(ft, PADDING_SIZE); return lsx_check_read_params(ft, 1, 8000., encoding, bits_per_sample, (uint64_t)num_samples, sox_true); } static int start_write(sox_format_t * ft) { int i, encoding = ft_enc(ft->encoding.bits_per_sample, ft->encoding.encoding); time_t now = sox_globals.repeatable? 0 : time(NULL); struct tm const * t = sox_globals.repeatable? gmtime(&now) : localtime(&now); int checksum = (VERSION_ >> 16) + VERSION_; checksum += t->tm_year + 1900; checksum += ((t->tm_mon + 1) << 8) + t->tm_mday; checksum += (t->tm_hour << 8) + t->tm_min; for (i = sizeof(id) - 2; i >= 0; i -= 2) checksum += (id[i] << 8) + id[i + 1]; checksum += encoding; return lsx_writedw(ft, 0) || lsx_writesw(ft, -checksum) || lsx_writedw(ft, VERSION_) || lsx_writesw(ft, t->tm_year + 1900) || lsx_writesb(ft, t->tm_mon + 1) || lsx_writesb(ft, t->tm_mday) || lsx_writesb(ft, t->tm_hour) || lsx_writesb(ft, t->tm_min) || lsx_writechars(ft, id, sizeof(id)) || lsx_writesw(ft, encoding) || lsx_padbytes(ft, PADDING_SIZE) ? SOX_EOF : SOX_SUCCESS; } static size_t write_samples( sox_format_t * ft, sox_sample_t const * buf, size_t nsamp) { size_t n = min(nsamp, MAX_FILE_SIZE - (size_t)ft->tell_off); if (n != nsamp) lsx_warn("audio truncated"); return lsx_rawwrite(ft, buf, n); } static int stop_write(sox_format_t * ft) { long num_samples = ft->tell_off - HEADER_SIZE; if (num_samples & 1) { sox_sample_t pad = 0; lsx_rawwrite(ft, &pad, 1); } if (ft->seekable) { unsigned i, file_size = ft->tell_off >> 1; int16_t int16; int checksum; if (!lsx_seeki(ft, (off_t)sizeof(uint32_t), SEEK_SET)) { lsx_readsw(ft, &int16); checksum = (file_size >> 16) + file_size - int16; if (!lsx_seeki(ft, (off_t)HEADER_SIZE, SEEK_SET)) { for (i = (num_samples + 1) >> 1; i; --i) { lsx_readsw(ft, &int16); checksum += int16; } if (!lsx_seeki(ft, (off_t)0, SEEK_SET)) { lsx_writedw(ft, file_size); lsx_writesw(ft, -checksum); return SOX_SUCCESS; } } } } lsx_warn("can't seek in output file `%s'; " "length in file header will be unspecified", ft->filename); return SOX_SUCCESS; } LSX_FORMAT_HANDLER(gsrt) { static char const *const names[] = { "gsrt", NULL }; static sox_rate_t const write_rates[] = { 8000, 0 }; static unsigned const write_encodings[] = { SOX_ENCODING_ALAW, 8, 0, SOX_ENCODING_ULAW, 8, 0, 0 }; static sox_format_handler_t const handler = { SOX_LIB_VERSION_CODE, "Grandstream ring tone", names, SOX_FILE_BIG_END | SOX_FILE_MONO, start_read, lsx_rawread, NULL, start_write, write_samples, stop_write, lsx_rawseek, write_encodings, write_rates, 0 }; return &handler; }