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/* libSoX NIST Sphere file format handler.
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* |
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* August 7, 2000 |
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* |
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* Copyright (C) 2000 Chris Bagwell (cbagwell@sprynet.com) |
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* |
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* This library is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation; either version 2.1 of the License, or (at |
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* your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser |
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* General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this library; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "sox_i.h" |
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#include <string.h> |
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static int start_read(sox_format_t * ft) |
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{ |
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unsigned long header_size_ul = 0, num_samples_ul = 0; |
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sox_encoding_t encoding = SOX_ENCODING_SIGN2; |
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size_t header_size, bytes_read; |
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size_t num_samples = 0; |
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unsigned bytes_per_sample = 0; |
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unsigned channels = 1; |
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unsigned rate = 16000; |
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char fldname[64], fldtype[16], fldsval[128]; |
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char * buf; |
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/* Magic header */ |
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if (lsx_reads(ft, fldname, (size_t)8) || strncmp(fldname, "NIST_1A", (size_t)7) != 0) { |
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lsx_fail_errno(ft, SOX_EHDR, "Sphere header does not begin with magic word `NIST_1A'"); |
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return (SOX_EOF); |
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} |
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if (lsx_reads(ft, fldsval, (size_t)8)) { |
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lsx_fail_errno(ft, SOX_EHDR, "Error reading Sphere header"); |
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return (SOX_EOF); |
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} |
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/* Determine header size, and allocate a buffer large enough to hold it. */ |
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sscanf(fldsval, "%lu", &header_size_ul); |
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if (header_size_ul < 16) { |
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lsx_fail_errno(ft, SOX_EHDR, "Error reading Sphere header"); |
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return (SOX_EOF); |
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} |
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buf = lsx_malloc(header_size = header_size_ul); |
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/* Skip what we have read so far */ |
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header_size -= 16; |
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if (lsx_reads(ft, buf, header_size) == SOX_EOF) { |
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lsx_fail_errno(ft, SOX_EHDR, "Error reading Sphere header"); |
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free(buf); |
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return (SOX_EOF); |
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} |
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header_size -= (strlen(buf) + 1); |
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while (strncmp(buf, "end_head", (size_t)8) != 0) { |
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if (strncmp(buf, "sample_n_bytes", (size_t)14) == 0) |
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sscanf(buf, "%63s %15s %u", fldname, fldtype, &bytes_per_sample); |
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else if (strncmp(buf, "channel_count", (size_t)13) == 0) |
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sscanf(buf, "%63s %15s %u", fldname, fldtype, &channels); |
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else if (strncmp(buf, "sample_count ", (size_t)13) == 0) |
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sscanf(buf, "%53s %15s %lu", fldname, fldtype, &num_samples_ul); |
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else if (strncmp(buf, "sample_rate ", (size_t)12) == 0) |
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sscanf(buf, "%53s %15s %u", fldname, fldtype, &rate); |
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else if (strncmp(buf, "sample_coding", (size_t)13) == 0) { |
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sscanf(buf, "%63s %15s %127s", fldname, fldtype, fldsval); |
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if (!strcasecmp(fldsval, "ulaw") || !strcasecmp(fldsval, "mu-law")) |
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encoding = SOX_ENCODING_ULAW; |
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else if (!strcasecmp(fldsval, "pcm")) |
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encoding = SOX_ENCODING_SIGN2; |
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else { |
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lsx_fail_errno(ft, SOX_EFMT, "sph: unsupported coding `%s'", fldsval); |
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free(buf); |
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return SOX_EOF; |
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} |
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} |
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else if (strncmp(buf, "sample_byte_format", (size_t)18) == 0) { |
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sscanf(buf, "%53s %15s %127s", fldname, fldtype, fldsval); |
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if (strcmp(fldsval, "01") == 0) /* Data is little endian. */ |
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ft->encoding.reverse_bytes = MACHINE_IS_BIGENDIAN; |
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else if (strcmp(fldsval, "10") == 0) /* Data is big endian. */ |
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ft->encoding.reverse_bytes = MACHINE_IS_LITTLEENDIAN; |
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else if (strcmp(fldsval, "1")) { |
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lsx_fail_errno(ft, SOX_EFMT, "sph: unsupported coding `%s'", fldsval); |
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free(buf); |
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return SOX_EOF; |
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} |
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} |
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if (lsx_reads(ft, buf, header_size) == SOX_EOF) { |
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lsx_fail_errno(ft, SOX_EHDR, "Error reading Sphere header"); |
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free(buf); |
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return (SOX_EOF); |
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} |
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header_size -= (strlen(buf) + 1); |
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} |
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if (!bytes_per_sample) |
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bytes_per_sample = encoding == SOX_ENCODING_ULAW? 1 : 2; |
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while (header_size) { |
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bytes_read = lsx_readbuf(ft, buf, header_size); |
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if (bytes_read == 0) { |
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free(buf); |
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return (SOX_EOF); |
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} |
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header_size -= bytes_read; |
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} |
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free(buf); |
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if (ft->seekable) { |
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/* Check first four bytes of data to see if it's shorten compressed. */ |
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char shorten_check[4]; |
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if (lsx_readchars(ft, shorten_check, sizeof(shorten_check))) |
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return SOX_EOF; |
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lsx_seeki(ft, -(off_t)sizeof(shorten_check), SEEK_CUR); |
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if (!memcmp(shorten_check, "ajkg", sizeof(shorten_check))) { |
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lsx_fail_errno(ft, SOX_EFMT, |
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"File uses shorten compression, cannot handle this."); |
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return (SOX_EOF); |
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} |
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} |
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num_samples = num_samples_ul; |
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return lsx_check_read_params(ft, channels, (sox_rate_t)rate, encoding, |
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bytes_per_sample << 3, (uint64_t)num_samples * channels, sox_true); |
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} |
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static int write_header(sox_format_t * ft) |
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{ |
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char buf[128]; |
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uint64_t samples = (ft->olength ? ft->olength : ft->signal.length) / ft->signal.channels; |
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lsx_writes(ft, "NIST_1A\n"); |
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lsx_writes(ft, " 1024\n"); |
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if (samples) { |
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sprintf(buf, "sample_count -i %" PRIu64 "\n", samples); |
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lsx_writes(ft, buf); |
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} |
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sprintf(buf, "sample_n_bytes -i %d\n", ft->encoding.bits_per_sample >> 3); |
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lsx_writes(ft, buf); |
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sprintf(buf, "channel_count -i %d\n", ft->signal.channels); |
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lsx_writes(ft, buf); |
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if (ft->encoding.bits_per_sample == 8) |
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sprintf(buf, "sample_byte_format -s1 1\n"); |
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else |
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sprintf(buf, "sample_byte_format -s2 %s\n", |
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ft->encoding.reverse_bytes != MACHINE_IS_BIGENDIAN ? "10" : "01"); |
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lsx_writes(ft, buf); |
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sprintf(buf, "sample_rate -i %u\n", (unsigned) (ft->signal.rate + .5)); |
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lsx_writes(ft, buf); |
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if (ft->encoding.encoding == SOX_ENCODING_ULAW) |
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lsx_writes(ft, "sample_coding -s4 ulaw\n"); |
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else |
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lsx_writes(ft, "sample_coding -s3 pcm\n"); |
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lsx_writes(ft, "end_head\n"); |
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lsx_padbytes(ft, 1024 - (size_t)lsx_tell(ft)); |
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return SOX_SUCCESS; |
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} |
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LSX_FORMAT_HANDLER(sphere) |
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{ |
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static char const *const names[] = {"sph", "nist", NULL}; |
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static unsigned const write_encodings[] = { |
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SOX_ENCODING_SIGN2, 8, 16, 24, 32, 0, |
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SOX_ENCODING_ULAW, 8, 0, |
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0 |
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}; |
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static sox_format_handler_t const handler = {SOX_LIB_VERSION_CODE, |
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"SPeech HEader Resources; defined by NIST", names, SOX_FILE_REWIND, |
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start_read, lsx_rawread, NULL, |
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write_header, lsx_rawwrite, NULL, |
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lsx_rawseek, write_encodings, NULL, 0 |
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}; |
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return &handler; |
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} |
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