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SOX(1) UNIX Programmer's Manual SOX(1) NAME sox - SOund eXchange - universal sound sample translator SYNOPSIS sox _i_n_f_i_l_e _o_u_t_f_i_l_e sox _i_n_f_i_l_e _o_u_t_f_i_l_e [ _e_f_f_e_c_t [ _e_f_f_e_c_t _o_p_t_i_o_n_s ... ] ] sox _i_n_f_i_l_e -e _e_f_f_e_c_t [ _e_f_f_e_c_t _o_p_t_i_o_n_s ... ] sox [ _g_e_n_e_r_a_l _o_p_t_i_o_n_s ] [ _f_o_r_m_a_t _o_p_t_i_o_n_s ] _i_f_i_l_e [ _f_o_r_m_a_t _o_p_t_i_o_n_s ] _o_f_i_l_e [ _e_f_f_e_c_t [ _e_f_f_e_c_t _o_p_t_i_o_n_s ... ] ] _G_e_n_e_r_a_l _o_p_t_i_o_n_s: [ -V ] [ -v _v_o_l_u_m_e ] _F_o_r_m_a_t _o_p_t_i_o_n_s: [ -t _f_i_l_e_t_y_p_e ] [ -r _r_a_t_e ] [ -s/-u/-U/-A ] [ -b/-w/-l/-f/-d/-D ] [ -c _c_h_a_n_n_e_l_s ] [ -x ] _E_f_f_e_c_t_s: copy rate avg stat echo _d_e_l_a_y _v_o_l_u_m_e [ _d_e_l_a_y _v_o_l_u_m_e ... ] vibro _s_p_e_e_d [ _d_e_p_t_h ] lowp _c_e_n_t_e_r band [ -_n ] _c_e_n_t_e_r [ _w_i_d_t_h ] DESCRIPTION _S_o_x translates sound files from one format to another, pos- sibly doing a sound effect. OPTIONS The option syntax is a little grotty, but in essence: sox file.au file.voc translates a sound sample in SUN Sparc .AU format into a SoundBlaster .VOC file, while sox -v 0.5 file.au -rate 12000 file.voc rate does the same format translation but also lowers the ampli- tude by 1/2 and changes the sampling rate from 8000 hertz to 12000 hertz via the rate _s_o_u_n_d _e_f_f_e_c_t loop. File type options: -t _f_i_l_e_t_y_p_e gives the type of the sound sample file. -r _r_a_t_e Give sample rate in Hertz of file. -s/-u/-U/-A The sample data is signed linear (2's complement), unsigned linear, U-law (logarithmic), or A-law (logarithmic). U-law and A-law are the U.S. and international standards for logarithmic telephone sound compression. -b/-w/-l/-f/-d/-D The sample data is in bytes, 16-bit words, 32-bit Printed 4/16/92 1 SOX(1) UNIX Programmer's Manual SOX(1) longwords, 32-bit floats, 64-bit double floats, or 80-bit IEEE floats. Floats and double floats are in native machine format. -x The sample data is in XINU format; that is, it comes from a machine with the opposite word order than yours and must be swapped according to the word-size given above. Only 16-bit and 32-bit integer data may be swapped. Machine-format floating-point data is not portable. IEEE floats are a fixed, portable format. ??? -c _c_h_a_n_n_e_l_s The number of sound channels in the data file. This may be 1, 2, or 4; for mono, stereo, or quad sound data. General options: -e after the input file allows you to avoid giving an output file and just name an effect. This is only useful with the stat effect. -v _v_o_l_u_m_e Change amplitude (floating point); less than 1.0 decreases, greater than 1.0 increases. Note: we perceive volume logarithmically, not linearly. Note: see the stat effect. -V Print a description of processing phases. Useful for figuring out exactly how _s_o_x is mangling your sound samples. The input and output files may be standard input and output. This is specified by '-'. The -t _t_y_p_e option must be given in this case, else _s_o_x will not know the format of the given file. The -t, -r, -s/-u/-U/-A, -b/-w/-l/-f/-d/-D and -x options refer to the input data when given before the input file name. After, they refer to the output data. If you don't give an output file name, _s_o_x will just read the input file. This is useful for validating structured file formats; the stat effect may also be used via the -e option. FILE TYPES _S_o_x needs to know the formats of the input and output files. File formats which have headers are checked, if that header doesn't seem right, the program exits with an appropriate message. Currently, the raw (no header), IRCAM Sound Files, Sound Blaster, SPARC .AU (w/header), Mac HCOM, PC/DOS .SOU, Sndtool, and Sounder, NeXT .SND, and Amiga/SGI AIFF and 8SVX formats are supported. Printed 4/16/92 2 SOX(1) UNIX Programmer's Manual SOX(1) .aiff AIFF files used on Amiga and SGI. Note: the AIFF format supports only one SSND chunk. It does not support multiple sound chunks, or the 8SVX musical instrument description format. AIFF files are multimedia archives and and can have multiple audio and picture chunks. You may need a separate archiver to work with them. .au SUN Microsystems AU files. There are apparently many types of .au files; DEC has invented its own with a different magic number and word order. The .au handler can read these files but will not write them. Some .au files have valid AU headers and some do not. The latter are probably original SUN u-law 8000 hz samples. These can be dealt with using the .ul format (see below). .hcom Macintosh HCOM files. These are (apparently) Mac FSSD files with some variant of Huffman compres- sion. The Macintosh has wacky file formats and this format handler apparently doesn't handle all the ones it should. Mac users will need your usual arsenal of file converters to deal with an HCOM file under Unix or DOS. .raw Raw files (no header). The sample rate, size (byte, word, etc), and style (signed, unsigned, etc.) of the sample file must be given. The number of channels defaults to 1. .ub, .sb, .uw, .sw, .ul These are several suffices which serve as a short- hand for raw files with a given size and style. Thus, ub, sb, uw, sw, and ul correspond to "unsigned byte", "signed byte", "unsigned word", "signed word", and "ulaw" (byte). The sample rate defaults to 8000 hz if not explicitly set, and the number of channels (as always) defaults to 1. There are lots of Sparc samples floating around in u-law format with no header and fixed at a sample rate of 8000 hz. (Certain sound management software cheerfully ignores the headers.) Simi- larly, most Mac sound files are in unsigned byte format with a sample rate of 11025 or 22050 hz. .sf IRCAM Sound Files. SoundFiles are used by academic music software such as the CSound package, and the MixView sound sample editor. .voc Sound Blaster VOC files. VOC files are multi-part and contain silence Printed 4/16/92 3 SOX(1) UNIX Programmer's Manual SOX(1) parts, looping, and different sample rates for different chunks. On input, the silence parts are filled out, loops are rejected, and sample data with a new sample rate is rejected. Silence with a different sample rate is generated appropri- ately. On output, silence is not detected, nor are impossible sample rates. EFFECTS Only one effect from the palette may be applied to a sound sample. To do multiple effects you'll need to run _s_o_x in a pipeline. copy Copy the input file to the output file. This is the default effect if both files have the same sampling rate, or the rates are "close". rate Translate input sampling rate to output sampling rate via linear interpolation to the Least Common Multiple of the two sampling rates. This is the default effect if the two files have different sampling rates. This is fast but noisy. avg Mix 4- or 2-channel sound file into 2- or 1-channel file by averaging the samples for dif- ferent speakers. stat Do a statistical check on the input file, and print results on the standard error file. stat may copy the file untouched from input to out- put, if you select an output file. The "Volume Adjustment:" field in the statistics gives you the argument to the -v _n_u_m_b_e_r which will make the sample as loud as possible. echo [ _d_e_l_a_y _v_o_l_u_m_e ... ] Add echoing to a sound sample. Each delay/volume pair gives the delay in seconds and the volume (relative to 1.0) of that echo. If the volumes add up to more than 1.0, the sound Printed 4/16/92 4 SOX(1) UNIX Programmer's Manual SOX(1) will melt down instead of fad- ing away. vibro _s_p_e_e_d [ _d_e_p_t_h ] Add the world-famous Fender Vibro-Champ sound effect to a sound sample by using a sine wave as the volume knob. Speed gives the Hertz value of the wave. This must be under 30. Depth gives the amount the volume is cut into by the sine wave, ranging 0.0 to 1.0 and defaulting to 0.5. lowp _c_e_n_t_e_r Apply a low-pass filter. The frequency response drops loga- rithmically with _c_e_n_t_e_r fre- quency in the middle of the drop. The slope of the filter is quite gentle. band [ -_n ] _c_e_n_t_e_r [ _w_i_d_t_h ] Apply a band-pass filter. The frequency response drops loga- rithmically around the _c_e_n_t_e_r frequency. The _w_i_d_t_h gives the slope of the drop. The frequencies at _c_e_n_t_e_r + _w_i_d_t_h and _c_e_n_t_e_r - _w_i_d_t_h will be half of their original ampli- tudes. Band defaults to a mode oriented to pitched sig- nals, i.e. voice, singing, or instrumental music. The -_n (for noise) option uses the alternate mode for un-pitched signals. Band introduces noise in the shape of the filter, i.e. peaking at the _c_e_n_t_e_r frequency and settling around it. _S_o_x enforces certain effects. If the two files have dif- ferent sampling rates, the requested effect must be one of copy, or rate, If the two files have different numbers of channels, the avg effect must be requested. BUGS The syntax is horrific. It's very tempting to include a default system that allows an effect name as the program name and just pipes a sound sample from standard input to standard output, but the problem of inputting the sample rates makes this unworkable. Printed 4/16/92 5 SOX(1) UNIX Programmer's Manual SOX(1) FILES SEE ALSO NOTICES The echoplex effect is: Copyright (C) 1989 by Jef Poskanzer. Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. This software is provided "as is" without express or implied warranty. Printed 4/16/92 6