ref: d85eab9f640c6872faef17cfd2fc74a4d728ad77
dir: /src/formats.c/
/* Implements the public API for using libSoX file formats.
* All public functions & data are prefixed with sox_ .
*
* (c) 2005-8 Chris Bagwell and SoX contributors
*
* 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 <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifdef HAVE_IO_H
#include <io.h>
#endif
static char const * detect_magic(sox_format_t * ft, char const * ext)
{
char data[256];
size_t len = lsx_readbuf(ft, data, sizeof(data));
#define MAGIC(type, p2, l2, d2, p1, l1, d1) if (len >= p1 + l1 && \
!memcmp(data + p1, d1, l1) && !memcmp(data + p2, d2, l2)) return #type;
MAGIC(voc , 0, 0, "" , 0, 20, "Creative Voice File\x1a")
MAGIC(smp , 0, 0, "" , 0, 17, "SOUND SAMPLE DATA")
MAGIC(wve , 0, 0, "" , 0, 15, "ALawSoundFile**")
MAGIC(amr-wb, 0, 0, "" , 0, 9, "#!AMR-WB\n")
MAGIC(prc , 0, 0, "" , 0, 8, "\x37\x00\x00\x10\x6d\x00\x00\x10")
MAGIC(sph , 0, 0, "" , 0, 7, "NIST_1A")
MAGIC(amr-nb, 0, 0, "" , 0, 6, "#!AMR\n")
MAGIC(txw , 0, 0, "" , 0, 6, "LM8953")
MAGIC(sndt , 0, 0, "" , 0, 6, "SOUND\x1a")
MAGIC(vorbis, 0, 4, "OggS" , 29, 6, "vorbis")
MAGIC(speex , 0, 4, "OggS" , 28, 6, "Speex")
MAGIC(hcom ,65, 4, "FSSD" , 128,4, "HCOM")
MAGIC(wav , 0, 4, "RIFF" , 8, 4, "WAVE")
MAGIC(wav , 0, 4, "RIFX" , 8, 4, "WAVE")
MAGIC(aiff , 0, 4, "FORM" , 8, 4, "AIFF")
MAGIC(aifc , 0, 4, "FORM" , 8, 4, "AIFC")
MAGIC(8svx , 0, 4, "FORM" , 8, 4, "8SVX")
MAGIC(maud , 0, 4, "FORM" , 8, 4, "MAUD")
MAGIC(xa , 0, 0, "" , 0, 4, "XA\0\0")
MAGIC(xa , 0, 0, "" , 0, 4, "XAI\0")
MAGIC(xa , 0, 0, "" , 0, 4, "XAJ\0")
MAGIC(au , 0, 0, "" , 0, 4, ".snd")
MAGIC(au , 0, 0, "" , 0, 4, "dns.")
MAGIC(au , 0, 0, "" , 0, 4, "\0ds.")
MAGIC(au , 0, 0, "" , 0, 4, ".sd\0")
MAGIC(flac , 0, 0, "" , 0, 4, "fLaC")
MAGIC(avr , 0, 0, "" , 0, 4, "2BIT")
MAGIC(caf , 0, 0, "" , 0, 4, "caff")
MAGIC(wv , 0, 0, "" , 0, 4, "wvpk")
MAGIC(paf , 0, 0, "" , 0, 4, " paf")
MAGIC(sf , 0, 0, "" , 0, 4, "\144\243\001\0")
MAGIC(sf , 0, 0, "" , 0, 4, "\0\001\243\144")
MAGIC(sf , 0, 0, "" , 0, 4, "\144\243\002\0")
MAGIC(sf , 0, 0, "" , 0, 4, "\0\002\243\144")
MAGIC(sf , 0, 0, "" , 0, 4, "\144\243\003\0")
MAGIC(sf , 0, 0, "" , 0, 4, "\0\003\243\144")
MAGIC(sf , 0, 0, "" , 0, 4, "\144\243\004\0")
if (ext && !strcasecmp(ext, "snd"))
MAGIC(sndr , 7, 1, "" , 0, 2, "\0")
#undef MAGIC
return NULL;
}
sox_encodings_info_t const sox_encodings_info[] = {
{0 , "n/a" , "Unknown or not applicable"},
{0 , "Signed PCM" , "Signed Integer PCM"},
{0 , "Unsigned PCM" , "Unsigned Integer PCM"},
{0 , "F.P. PCM" , "Floating Point PCM"},
{0 , "F.P. PCM" , "Floating Point (text) PCM"},
{0 , "FLAC" , "FLAC"},
{0 , "HCOM" , "HCOM"},
{0 , "WavPack" , "WavPack"},
{0 , "F.P. WavPack" , "Floating Point WavPack"},
{SOX_LOSSY1, "u-law" , "u-law"},
{SOX_LOSSY1, "A-law" , "A-law"},
{SOX_LOSSY1, "G.721 ADPCM" , "G.721 ADPCM"},
{SOX_LOSSY1, "G.723 ADPCM" , "G.723 ADPCM"},
{SOX_LOSSY1, "CL ADPCM (8)" , "CL ADPCM (from 8-bit)"},
{SOX_LOSSY1, "CL ADPCM (16)", "CL ADPCM (from 16-bit)"},
{SOX_LOSSY1, "MS ADPCM" , "MS ADPCM"},
{SOX_LOSSY1, "IMA ADPCM" , "IMA ADPCM"},
{SOX_LOSSY1, "OKI ADPCM" , "OKI ADPCM"},
{SOX_LOSSY1, "DPCM" , "DPCM"},
{0 , "DWVW" , "DWVW"},
{0 , "DWVWN" , "DWVWN"},
{SOX_LOSSY2, "GSM" , "GSM"},
{SOX_LOSSY2, "MPEG audio" , "MPEG audio (layer I, II or III)"},
{SOX_LOSSY2, "Vorbis" , "Vorbis"},
{SOX_LOSSY2, "AMR-WB" , "AMR-WB"},
{SOX_LOSSY2, "AMR-NB" , "AMR-NB"},
{SOX_LOSSY2, "CVSD" , "CVSD"},
{SOX_LOSSY2, "LPC10" , "LPC10"},
};
assert_static(array_length(sox_encodings_info) == SOX_ENCODINGS,
SIZE_MISMATCH_BETWEEN_sox_encodings_t_AND_sox_encodings_info);
unsigned sox_precision(sox_encoding_t encoding, unsigned bits_per_sample)
{
switch (encoding) {
case SOX_ENCODING_DWVW: return bits_per_sample;
case SOX_ENCODING_DWVWN: return !bits_per_sample? 16: 0; /* ? */
case SOX_ENCODING_HCOM: return !(bits_per_sample & 7) && (bits_per_sample >> 3) - 1 < 1? bits_per_sample: 0;
case SOX_ENCODING_WAVPACK:
case SOX_ENCODING_FLAC: return !(bits_per_sample & 7) && (bits_per_sample >> 3) - 1 < 4? bits_per_sample: 0;
case SOX_ENCODING_SIGN2: return bits_per_sample <= 32? bits_per_sample : 0;
case SOX_ENCODING_UNSIGNED: return !(bits_per_sample & 7) && (bits_per_sample >> 3) - 1 < 4? bits_per_sample: 0;
case SOX_ENCODING_ALAW: return bits_per_sample == 8? 13: 0;
case SOX_ENCODING_ULAW: return bits_per_sample == 8? 14: 0;
case SOX_ENCODING_CL_ADPCM: return bits_per_sample? 8: 0;
case SOX_ENCODING_CL_ADPCM16: return bits_per_sample == 4? 13: 0;
case SOX_ENCODING_MS_ADPCM: return bits_per_sample == 4? 14: 0;
case SOX_ENCODING_IMA_ADPCM: return bits_per_sample == 4? 13: 0;
case SOX_ENCODING_OKI_ADPCM: return bits_per_sample == 4? 12: 0;
case SOX_ENCODING_G721: return bits_per_sample == 4? 12: 0;
case SOX_ENCODING_G723: return bits_per_sample == 3? 8:
bits_per_sample == 5? 14: 0;
case SOX_ENCODING_CVSD: return bits_per_sample == 1? 16: 0;
case SOX_ENCODING_DPCM: return bits_per_sample; /* ? */
case SOX_ENCODING_GSM:
case SOX_ENCODING_MP3:
case SOX_ENCODING_VORBIS:
case SOX_ENCODING_AMR_WB:
case SOX_ENCODING_AMR_NB:
case SOX_ENCODING_LPC10: return !bits_per_sample? 16: 0;
case SOX_ENCODING_WAVPACKF:
case SOX_ENCODING_FLOAT: return bits_per_sample == 32 ? 24: bits_per_sample == 64 ? 53: 0;
case SOX_ENCODING_FLOAT_TEXT: return !bits_per_sample? 53: 0;
case SOX_ENCODINGS:
case SOX_ENCODING_UNKNOWN: break;
}
return 0;
}
void sox_init_encodinginfo(sox_encodinginfo_t * e)
{
e->reverse_bytes = SOX_OPTION_DEFAULT;
e->reverse_nibbles = SOX_OPTION_DEFAULT;
e->reverse_bits = SOX_OPTION_DEFAULT;
e->compression = HUGE_VAL;
}
/*--------------------------------- Comments ---------------------------------*/
size_t sox_num_comments(sox_comments_t comments)
{
size_t result = 0;
if (!comments)
return 0;
while (*comments++)
++result;
return result;
}
void sox_append_comment(sox_comments_t * comments, char const * comment)
{
size_t n = sox_num_comments(*comments);
*comments = lsx_realloc(*comments, (n + 2) * sizeof(**comments));
assert(comment);
(*comments)[n++] = lsx_strdup(comment);
(*comments)[n] = 0;
}
void sox_append_comments(sox_comments_t * comments, char const * comment)
{
char * end;
if (comment) {
while ((end = strchr(comment, '\n'))) {
size_t len = end - comment;
char * c = lsx_malloc((len + 1) * sizeof(*c));
strncpy(c, comment, len);
c[len] = '\0';
sox_append_comment(comments, c);
comment += len + 1;
free(c);
}
if (*comment)
sox_append_comment(comments, comment);
}
}
sox_comments_t sox_copy_comments(sox_comments_t comments)
{
sox_comments_t result = 0;
if (comments) while (*comments)
sox_append_comment(&result, *comments++);
return result;
}
void sox_delete_comments(sox_comments_t * comments)
{
sox_comments_t p = *comments;
if (p) while (*p)
free(*p++);
free(*comments);
*comments = 0;
}
char * sox_cat_comments(sox_comments_t comments)
{
sox_comments_t p = comments;
size_t len = 0;
char * result;
if (p) while (*p)
len += strlen(*p++) + 1;
result = lsx_calloc(len? len : 1, sizeof(*result));
if ((p = comments) && *p) {
strcpy(result, *p);
while (*++p)
strcat(strcat(result, "\n"), *p);
}
return result;
}
char const * sox_find_comment(sox_comments_t comments, char const * id)
{
size_t len = strlen(id);
if (comments) for (;*comments; ++comments)
if (!strncasecmp(*comments, id, len) && (*comments)[len] == '=')
return *comments + len + 1;
return NULL;
}
static void set_endiannesses(sox_format_t * ft)
{
if (ft->encoding.opposite_endian)
ft->encoding.reverse_bytes = (ft->handler.flags & SOX_FILE_ENDIAN)?
!(ft->handler.flags & SOX_FILE_ENDBIG) != MACHINE_IS_BIGENDIAN : sox_true;
else if (ft->encoding.reverse_bytes == SOX_OPTION_DEFAULT)
ft->encoding.reverse_bytes = (ft->handler.flags & SOX_FILE_ENDIAN)?
!(ft->handler.flags & SOX_FILE_ENDBIG) == MACHINE_IS_BIGENDIAN : sox_false;
/* FIXME: Change reports to suitable warnings if trying
* to override something that can't be overridden. */
if (ft->handler.flags & SOX_FILE_ENDIAN) {
if (ft->encoding.reverse_bytes == (sox_option_t)
(!(ft->handler.flags & SOX_FILE_ENDBIG) != MACHINE_IS_BIGENDIAN))
sox_report("`%s': overriding file-type byte-order", ft->filename);
} else if (ft->encoding.reverse_bytes == sox_true)
sox_report("`%s': overriding machine byte-order", ft->filename);
if (ft->encoding.reverse_bits == SOX_OPTION_DEFAULT)
ft->encoding.reverse_bits = !!(ft->handler.flags & SOX_FILE_BIT_REV);
else if (ft->encoding.reverse_bits == !(ft->handler.flags & SOX_FILE_BIT_REV))
sox_report("`%s': overriding file-type bit-order", ft->filename);
if (ft->encoding.reverse_nibbles == SOX_OPTION_DEFAULT)
ft->encoding.reverse_nibbles = !!(ft->handler.flags & SOX_FILE_NIB_REV);
else
if (ft->encoding.reverse_nibbles == !(ft->handler.flags & SOX_FILE_NIB_REV))
sox_report("`%s': overriding file-type nibble-order", ft->filename);
}
static sox_bool is_seekable(sox_format_t const * ft)
{
struct stat st;
assert(ft);
if (!ft->fp)
return sox_false;
fstat(fileno(ft->fp), &st);
return ((st.st_mode & S_IFMT) == S_IFREG);
}
/* check that all settings have been given */
static int sox_checkformat(sox_format_t * ft)
{
ft->sox_errno = SOX_SUCCESS;
if (!ft->signal.rate) {
lsx_fail_errno(ft,SOX_EFMT,"sampling rate was not specified");
return SOX_EOF;
}
if (!ft->signal.precision) {
lsx_fail_errno(ft,SOX_EFMT,"data encoding was not specified");
return SOX_EOF;
}
return SOX_SUCCESS;
}
static char const * find_file_extension(char const * pathname)
{
/* First, chop off any path portions of filename. This
* prevents the next search from considering that part. */
char const * result = LAST_SLASH(pathname);
if (!result)
result = pathname;
/* Now look for an filename extension */
result = strrchr(result, '.');
if (result)
++result;
return result;
}
static sox_bool is_uri(char const * text)
{
if (!isalpha((int)*text))
return sox_false;
++text;
do {
if (!isalnum((int)*text) && !strchr("+-.", *text))
return sox_false;
++text;
} while (*text && *text != ':');
return *text == ':';
}
static FILE * xfopen(char const * identifier, char const * mode)
{
if (is_uri(identifier)) {
FILE * f = NULL;
#ifdef HAVE_POPEN
char const * const command_format = "wget --no-check-certificate -q -O- \"%s\"";
char * command = lsx_malloc(strlen(command_format) + strlen(identifier));
sprintf(command, command_format, identifier);
f = popen(command, "r");
free(command);
#else
sox_fail("open URL support has not been built into SoX");
#endif
return f;
}
return fopen(identifier, mode);
}
sox_format_t * sox_open_read(
char const * path,
sox_signalinfo_t const * signal,
sox_encodinginfo_t const * encoding,
char const * filetype)
{
sox_format_t * ft = lsx_calloc(1, sizeof(*ft));
sox_format_handler_t const * handler;
if (filetype) {
if (!(handler = sox_find_format(filetype, sox_false))) {
sox_fail("no handler for given file type `%s'", filetype);
goto error;
}
ft->handler = *handler;
}
if (!(ft->handler.flags & SOX_FILE_NOSTDIO)) {
sox_size_t input_bufsiz = sox_globals.input_bufsiz?
sox_globals.input_bufsiz : sox_globals.bufsiz;
if (!strcmp(path, "-")) { /* Use stdin if the filename is "-" */
if (sox_globals.stdin_in_use_by) {
sox_fail("`-' (stdin) already in use by `%s'", sox_globals.stdin_in_use_by);
goto error;
}
sox_globals.stdin_in_use_by = "audio input";
SET_BINARY_MODE(stdin);
ft->fp = stdin;
}
else if ((ft->fp = xfopen(path, "rb")) == NULL) {
sox_fail("can't open input file `%s': %s", path, strerror(errno));
goto error;
}
if (setvbuf (ft->fp, NULL, _IOFBF, sizeof(char) * input_bufsiz)) {
sox_fail("Can't set read buffer");
goto error;
}
ft->seekable = is_seekable(ft);
}
if (!filetype) {
if (ft->seekable) {
filetype = detect_magic(ft, find_file_extension(path));
lsx_rewind(ft);
}
if (filetype) {
sox_report("detected file format type `%s'", filetype);
if (!(handler = sox_find_format(filetype, sox_false))) {
sox_fail("no handler for detected file type `%s'", filetype);
goto error;
}
}
else {
if (!(filetype = find_file_extension(path))) {
sox_fail("can't determine type of `%s'", path);
goto error;
}
if (!(handler = sox_find_format(filetype, sox_true))) {
sox_fail("no handler for file extension `%s'", filetype);
goto error;
}
}
ft->handler = *handler;
if (ft->handler.flags & SOX_FILE_NOSTDIO) {
fclose(ft->fp);
ft->fp = NULL;
}
}
if (!ft->handler.startread && !ft->handler.read) {
sox_fail("file type `%s' isn't readable", filetype);
goto error;
}
ft->mode = 'r';
ft->filetype = lsx_strdup(filetype);
ft->filename = lsx_strdup(path);
if (signal)
ft->signal = *signal;
if (encoding)
ft->encoding = *encoding;
else sox_init_encodinginfo(&ft->encoding);
set_endiannesses(ft);
ft->priv = lsx_calloc(1, ft->handler.priv_size);
/* Read and write starters can change their formats. */
if (ft->handler.startread && (*ft->handler.startread)(ft) != SOX_SUCCESS) {
sox_fail("can't open input file `%s': %s", ft->filename, ft->sox_errstr);
goto error;
}
/* Fill in some defaults: */
if (!ft->signal.precision)
ft->signal.precision = sox_precision(ft->encoding.encoding, ft->encoding.bits_per_sample);
if (!(ft->handler.flags & SOX_FILE_PHONY) && !ft->signal.channels)
ft->signal.channels = 1;
if (sox_checkformat(ft) == SOX_SUCCESS)
return ft;
sox_fail("bad input format for file `%s': %s", ft->filename, ft->sox_errstr);
error:
if (ft->fp && ft->fp != stdin)
fclose(ft->fp);
free(ft->priv);
free(ft->filename);
free(ft->filetype);
free(ft);
return NULL;
}
sox_bool sox_format_supports_encoding(
char const * path,
char const * filetype,
sox_encodinginfo_t const * encoding)
{
#define enc_arg(T) (T)handler->write_formats[i++]
sox_bool is_file_extension = filetype == NULL;
sox_format_handler_t const * handler;
unsigned i = 0, s;
sox_encoding_t e;
assert(path);
assert(encoding);
if (!filetype)
filetype = find_file_extension(path);
if (!filetype || !(handler = sox_find_format(filetype, is_file_extension)) ||
!handler->write_formats)
return sox_false;
while ((e = enc_arg(sox_encoding_t))) {
if (e == encoding->encoding) {
while ((s = enc_arg(unsigned)))
if (s == encoding->bits_per_sample)
return sox_true;
break;
}
while (enc_arg(unsigned));
}
return sox_false;
#undef enc_arg
}
static void set_output_format(sox_format_t * ft)
{
sox_encoding_t e;
unsigned i, s;
unsigned const * encodings = ft->handler.write_formats;
#define enc_arg(T) (T)encodings[i++]
if (ft->handler.write_rates){
if (!ft->signal.rate)
ft->signal.rate = ft->handler.write_rates[0];
else {
sox_rate_t r;
i = 0;
while ((r = ft->handler.write_rates[i++])) {
if (r == ft->signal.rate)
break;
}
if (r != ft->signal.rate) {
sox_rate_t given = ft->signal.rate, max = 0;
ft->signal.rate = HUGE_VAL;
i = 0;
while ((r = ft->handler.write_rates[i++])) {
if (r > given && r < ft->signal.rate)
ft->signal.rate = r;
else max = max(r, max);
}
if (ft->signal.rate == HUGE_VAL)
ft->signal.rate = max;
sox_warn("%s can't encode at %gHz; using %gHz", ft->handler.names[0], given, ft->signal.rate);
}
}
}
else if (!ft->signal.rate)
ft->signal.rate = SOX_DEFAULT_RATE;
if (ft->handler.flags & SOX_FILE_CHANS) {
if (ft->signal.channels == 1 && !(ft->handler.flags & SOX_FILE_MONO)) {
ft->signal.channels = (ft->handler.flags & SOX_FILE_STEREO)? 2 : 4;
sox_warn("%s can't encode mono; setting channels to %u", ft->handler.names[0], ft->signal.channels);
} else
if (ft->signal.channels == 2 && !(ft->handler.flags & SOX_FILE_STEREO)) {
ft->signal.channels = (ft->handler.flags & SOX_FILE_QUAD)? 4 : 1;
sox_warn("%s can't encode stereo; setting channels to %u", ft->handler.names[0], ft->signal.channels);
} else
if (ft->signal.channels == 4 && !(ft->handler.flags & SOX_FILE_QUAD)) {
ft->signal.channels = (ft->handler.flags & SOX_FILE_STEREO)? 2 : 1;
sox_warn("%s can't encode quad; setting channels to %u", ft->handler.names[0], ft->signal.channels);
}
} else ft->signal.channels = max(ft->signal.channels, 1);
if (!encodings)
return;
/* If an encoding has been given, check if it supported by this handler */
if (ft->encoding.encoding) {
i = 0;
while ((e = enc_arg(sox_encoding_t))) {
if (e == ft->encoding.encoding)
break;
while (enc_arg(unsigned));
}
if (e != ft->encoding.encoding) {
sox_warn("%s can't encode %s", ft->handler.names[0], sox_encodings_info[ft->encoding.encoding].desc);
ft->encoding.encoding = 0;
}
else {
unsigned max_p = 0;
unsigned max_p_s = 0;
unsigned given_size = 0;
sox_bool found = sox_false;
if (ft->encoding.bits_per_sample)
given_size = ft->encoding.bits_per_sample;
ft->encoding.bits_per_sample = 65;
while ((s = enc_arg(unsigned))) {
if (s == given_size)
found = sox_true;
if (sox_precision(e, s) >= ft->signal.precision) {
if (s < ft->encoding.bits_per_sample)
ft->encoding.bits_per_sample = s;
}
else if (sox_precision(e, s) > max_p) {
max_p = sox_precision(e, s);
max_p_s = s;
}
}
if (ft->encoding.bits_per_sample == 65)
ft->encoding.bits_per_sample = max_p_s;
if (given_size) {
if (found)
ft->encoding.bits_per_sample = given_size;
else sox_warn("%s can't encode %s to %u-bit", ft->handler.names[0], sox_encodings_info[ft->encoding.encoding].desc, given_size);
}
}
}
/* If a size has been given, check if it supported by this handler */
if (!ft->encoding.encoding && ft->encoding.bits_per_sample) {
i = 0;
s= 0;
while (s != ft->encoding.bits_per_sample && (e = enc_arg(sox_encoding_t)))
while ((s = enc_arg(unsigned)) && s != ft->encoding.bits_per_sample);
if (s != ft->encoding.bits_per_sample) {
sox_warn("%s can't encode to %u-bit", ft->handler.names[0], ft->encoding.bits_per_sample);
ft->encoding.bits_per_sample = 0;
}
else ft->encoding.encoding = e;
}
/* Find the smallest lossless encoding with precision >= signal.precision */
if (!ft->encoding.encoding) {
ft->encoding.bits_per_sample = 65;
i = 0;
while ((e = enc_arg(sox_encoding_t)))
while ((s = enc_arg(unsigned)))
if (!(sox_encodings_info[e].flags & (SOX_LOSSY1 | SOX_LOSSY2)) &&
sox_precision(e, s) >= ft->signal.precision && s < ft->encoding.bits_per_sample) {
ft->encoding.encoding = e;
ft->encoding.bits_per_sample = s;
}
}
/* Find the smallest lossy encoding with precision >= signal precision,
* or, if none such, the highest precision encoding */
if (!ft->encoding.encoding) {
unsigned max_p = 0;
sox_encoding_t max_p_e = 0;
unsigned max_p_s = 0;
i = 0;
while ((e = enc_arg(sox_encoding_t)))
do {
s = enc_arg(unsigned);
if (sox_precision(e, s) >= ft->signal.precision) {
if (s < ft->encoding.bits_per_sample) {
ft->encoding.encoding = e;
ft->encoding.bits_per_sample = s;
}
}
else if (sox_precision(e, s) > max_p) {
max_p = sox_precision(e, s);
max_p_e = e;
max_p_s = s;
}
} while (s);
if (!ft->encoding.encoding) {
ft->encoding.encoding = max_p_e;
ft->encoding.bits_per_sample = max_p_s;
}
}
ft->signal.precision = min(ft->signal.precision, sox_precision(ft->encoding.encoding, ft->encoding.bits_per_sample));
#undef enc_arg
}
sox_format_t * sox_open_write(
char const * path,
sox_signalinfo_t const * signal,
sox_encodinginfo_t const * encoding,
char const * filetype,
sox_oob_t const * oob,
sox_bool (*overwrite_permitted)(const char *filename))
{
sox_format_t * ft = lsx_calloc(sizeof(*ft), 1);
sox_format_handler_t const * handler;
if (!path || !signal) {
sox_fail("must specify file name and signal parameters to write file");
goto error;
}
if (filetype) {
if (!(handler = sox_find_format(filetype, sox_false))) {
sox_fail("no handler for given file type `%s'", filetype);
goto error;
}
ft->handler = *handler;
}
else {
if (!(filetype = find_file_extension(path))) {
sox_fail("can't determine type of `%s'", path);
goto error;
}
if (!(handler = sox_find_format(filetype, sox_true))) {
sox_fail("no handler for file extension `%s'", filetype);
goto error;
}
ft->handler = *handler;
}
if (!ft->handler.startwrite && !ft->handler.write) {
sox_fail("file type `%s' isn't writeable", filetype);
goto error;
}
if (!(ft->handler.flags & SOX_FILE_NOSTDIO)) {
if (!strcmp(path, "-")) { /* Use stdout if the filename is "-" */
if (sox_globals.stdout_in_use_by) {
sox_fail("`-' (stdout) already in use by `%s'", sox_globals.stdout_in_use_by);
goto error;
}
sox_globals.stdout_in_use_by = "audio output";
SET_BINARY_MODE(stdout);
ft->fp = stdout;
}
else {
struct stat st;
if (!stat(path, &st) && (st.st_mode & S_IFMT) == S_IFREG &&
(overwrite_permitted && !overwrite_permitted(path))) {
sox_fail("permission to overwrite '%s' denied", path);
goto error;
}
if ((ft->fp = fopen(path, "wb")) == NULL) {
sox_fail("can't open output file `%s': %s", path, strerror(errno));
goto error;
}
}
/* stdout tends to be line-buffered. Override this */
/* to be Full Buffering. */
if (setvbuf (ft->fp, NULL, _IOFBF, sizeof(char) * sox_globals.bufsiz)) {
sox_fail("Can't set write buffer");
goto error;
}
ft->seekable = is_seekable(ft);
}
ft->filetype = lsx_strdup(filetype);
ft->filename = lsx_strdup(path);
ft->mode = 'w';
ft->signal = *signal;
if (encoding)
ft->encoding = *encoding;
else sox_init_encodinginfo(&ft->encoding);
set_endiannesses(ft);
if (oob) {
ft->oob = *oob;
/* deep copy: */
ft->oob.comments = sox_copy_comments(oob->comments);
}
set_output_format(ft);
/* FIXME: doesn't cover the situation where
* codec changes audio length due to block alignment (e.g. 8svx, gsm): */
if (signal->rate && signal->channels)
ft->signal.length = ft->signal.length * ft->signal.rate / signal->rate *
ft->signal.channels / signal->channels + .5;
if ((ft->handler.flags & SOX_FILE_REWIND) && !ft->signal.length && !ft->seekable)
sox_warn("can't seek in output file `%s'; length in file header will be unspecified", ft->filename);
ft->priv = lsx_calloc(1, ft->handler.priv_size);
/* Read and write starters can change their formats. */
if (ft->handler.startwrite && (ft->handler.startwrite)(ft) != SOX_SUCCESS){
sox_fail("can't open output file `%s': %s", ft->filename, ft->sox_errstr);
goto error;
}
if (sox_checkformat(ft) == SOX_SUCCESS)
return ft;
sox_fail("bad format for output file `%s': %s", ft->filename, ft->sox_errstr);
error:
if (ft->fp && ft->fp != stdout)
fclose(ft->fp);
free(ft->priv);
free(ft->filename);
free(ft->filetype);
free(ft);
return NULL;
}
sox_size_t sox_read(sox_format_t * ft, sox_sample_t * buf, sox_size_t len)
{
sox_size_t actual = ft->handler.read? (*ft->handler.read)(ft, buf, len) : 0;
return (actual > len? 0 : actual);
}
sox_size_t sox_write(sox_format_t * ft, const sox_sample_t *buf, sox_size_t len)
{
sox_size_t ret = ft->handler.write? (*ft->handler.write)(ft, buf, len) : 0;
ft->olength += ret;
return ret;
}
int sox_close(sox_format_t * ft)
{
int rc = SOX_SUCCESS;
if (ft->mode == 'r')
rc = ft->handler.stopread? (*ft->handler.stopread)(ft) : SOX_SUCCESS;
else {
if (ft->handler.flags & SOX_FILE_REWIND) {
if (ft->olength != ft->signal.length && ft->seekable) {
rc = lsx_seeki(ft, 0, 0);
if (rc == SOX_SUCCESS)
rc = ft->handler.stopwrite? (*ft->handler.stopwrite)(ft)
: ft->handler.startwrite?(*ft->handler.startwrite)(ft) : SOX_SUCCESS;
}
}
else rc = ft->handler.stopwrite? (*ft->handler.stopwrite)(ft) : SOX_SUCCESS;
}
if (ft->fp && ft->fp != stdin && ft->fp != stdout)
fclose(ft->fp);
free(ft->filename);
free(ft->filetype);
sox_delete_comments(&ft->oob.comments);
free(ft);
return rc;
}
int sox_seek(sox_format_t * ft, sox_size_t offset, int whence)
{
/* FIXME: Implement SOX_SEEK_CUR and SOX_SEEK_END. */
if (whence != SOX_SEEK_SET)
return SOX_EOF; /* FIXME: return SOX_EINVAL */
/* If file is a seekable file and this handler supports seeking,
* then invoke handler's function.
*/
if (ft->seekable && ft->handler.seek)
return (*ft->handler.seek)(ft, offset);
return SOX_EOF; /* FIXME: return SOX_EBADF */
}
static int strcaseends(char const * str, char const * end)
{
size_t str_len = strlen(str), end_len = strlen(end);
return str_len >= end_len && !strcasecmp(str + str_len - end_len, end);
}
sox_bool sox_is_playlist(char const * filename)
{
return strcaseends(filename, ".m3u") || strcaseends(filename, ".pls");
}
int sox_parse_playlist(sox_playlist_callback_t callback, void * p, char const * const listname)
{
sox_bool const is_pls = strcaseends(listname, ".pls");
int const comment_char = "#;"[is_pls];
size_t text_length = 100;
char * text = lsx_malloc(text_length + 1);
char * dirname = lsx_strdup(listname);
char * slash_pos = LAST_SLASH(dirname);
FILE * file = xfopen(listname, "r");
char * filename;
int c, result = SOX_SUCCESS;
if (!slash_pos)
*dirname = '\0';
else
*slash_pos = '\0';
if (file == NULL) {
sox_fail("Can't open playlist file `%s': %s", listname, strerror(errno));
result = SOX_EOF;
}
else {
do {
size_t i = 0;
size_t begin = 0, end = 0;
while (isspace(c = getc(file)));
if (c == EOF)
break;
while (c != EOF && !strchr("\r\n", c) && c != comment_char) {
if (i == text_length)
text = lsx_realloc(text, (text_length <<= 1) + 1);
text[i++] = c;
if (!strchr(" \t\f", c))
end = i;
c = getc(file);
}
if (ferror(file))
break;
if (c == comment_char) {
do c = getc(file);
while (c != EOF && !strchr("\r\n", c));
if (ferror(file))
break;
}
text[end] = '\0';
if (is_pls) {
char dummy;
if (!strncasecmp(text, "file", 4) && sscanf(text + 4, "%*u=%c", &dummy) == 1)
begin = strchr(text + 5, '=') - text + 1;
else end = 0;
}
if (begin != end) {
char const * id = text + begin;
if (!dirname[0] || is_uri(id) || IS_ABSOLUTE(id))
filename = lsx_strdup(id);
else {
filename = lsx_malloc(strlen(dirname) + strlen(id) + 2);
sprintf(filename, "%s/%s", dirname, id);
}
if (sox_is_playlist(filename))
sox_parse_playlist(callback, p, filename);
else if (callback(p, filename))
c = EOF;
free(filename);
}
} while (c != EOF);
if (ferror(file)) {
sox_fail("error reading playlist file `%s': %s", listname, strerror(errno));
result = SOX_EOF;
}
fclose(file);
}
free(text);
free(dirname);
return result;
}
#ifdef HAVE_LIBLTDL /* Plugin format handlers */
#include <ltdl.h>
#define MAX_FORMATS 256 /* FIXME: Use a vector, not a fixed-size array */
#define MAX_NAME_LEN 1024 /* FIXME: Use vasprintf */
static sox_bool plugins_initted = sox_false;
sox_format_tab_t sox_format_fns[MAX_FORMATS + 1];
static unsigned nformats = 0;
static int init_format(const char *file, lt_ptr data)
{
lt_dlhandle lth = lt_dlopenext(file);
const char *end = file + strlen(file);
const char prefix[] = "sox_fmt_";
char fnname[MAX_NAME_LEN];
char *start = strstr(file, prefix);
(void)data;
if (start && (start += sizeof(prefix) - 1) < end) {
int ret = snprintf(fnname, MAX_NAME_LEN, "sox_%.*s_format_fn", end - start, start);
if (ret > 0 && ret < MAX_NAME_LEN) {
union {sox_format_fn_t fn; lt_ptr ptr;} ltptr;
ltptr.ptr = lt_dlsym(lth, fnname);
sox_debug("opening format plugin `%s': library %p, entry point %p\n", fnname, (void *)lth, ltptr.ptr);
if (nformats < MAX_FORMATS && ltptr.fn && (ltptr.fn()->sox_lib_version_code & ~255) == (SOX_LIB_VERSION_CODE & ~255))
sox_format_fns[nformats++].fn = ltptr.fn;
}
}
return SOX_SUCCESS;
}
int sox_format_init(void) /* Find & load format handlers. */
{
int ret;
if ((ret = lt_dlinit()) != 0) {
sox_fail("lt_dlinit failed with %d error(s): %s", ret, lt_dlerror());
return SOX_EOF;
}
plugins_initted = sox_true;
lt_dlforeachfile(PKGLIBDIR, init_format, NULL);
return SOX_SUCCESS;
}
void sox_format_quit(void) /* Cleanup things. */
{
int ret;
if (plugins_initted && (ret = lt_dlexit()) != 0)
sox_fail("lt_dlexit failed with %d error(s): %s", ret, lt_dlerror());
}
#else /* Static format handlers */
#define FORMAT(f) extern sox_format_handler_t const * sox_##f##_format_fn(void);
#include "formats.h"
#undef FORMAT
sox_format_tab_t sox_format_fns[] = {
#define FORMAT(f) {NULL, sox_##f##_format_fn},
#include "formats.h"
#undef FORMAT
{NULL, NULL}
};
int sox_format_init(void) {return SOX_SUCCESS;}
void sox_format_quit(void) {}
#endif
/* Find a named format in the formats library.
*
* (c) 2005-8 Chris Bagwell and SoX contributors.
* Copyright 1991 Lance Norskog And Sundry Contributors.
*
* This source code is freely redistributable and may be used for any
* purpose. This copyright notice must be maintained.
*
* Lance Norskog, Sundry Contributors, Chris Bagwell and SoX contributors
* are not responsible for the consequences of using this software.
*/
sox_format_handler_t const * sox_find_format(char const * name, sox_bool no_dev)
{
sox_size_t f, n;
if (name) for (f = 0; sox_format_fns[f].fn; ++f) {
sox_format_handler_t const * handler = sox_format_fns[f].fn();
if (!(no_dev && (handler->flags & SOX_FILE_DEVICE)))
for (n = 0; handler->names[n]; ++n)
if (!strcasecmp(handler->names[n], name))
return handler; /* Found it. */
}
return NULL;
}