Emeric Vigier | eebea67 | 2012-08-06 17:36:30 -0400 | [diff] [blame] | 1 | /* |
| 2 | ** Copyright (C) 2005-2011 Erik de Castro Lopo <erikd@mega-nerd.com> |
| 3 | ** |
| 4 | ** This program is free software; you can redistribute it and/or modify |
| 5 | ** it under the terms of the GNU General Public License as published by |
| 6 | ** the Free Software Foundation; either version 2 of the License, or |
| 7 | ** (at your option) any later version. |
| 8 | ** |
| 9 | ** This program is distributed in the hope that it will be useful, |
| 10 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | ** GNU General Public License for more details. |
| 13 | ** |
| 14 | ** You should have received a copy of the GNU General Public License |
| 15 | ** along with this program; if not, write to the Free Software |
| 16 | ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include "config.h" |
| 20 | |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <unistd.h> |
| 24 | #include <string.h> |
| 25 | #include <math.h> |
| 26 | |
| 27 | #if (HAVE_SNDFILE) |
| 28 | |
| 29 | #include <samplerate.h> |
| 30 | #include <sndfile.h> |
| 31 | |
| 32 | #define ARRAY_LEN(x) ((int) (sizeof (x) / sizeof ((x) [0]))) |
| 33 | |
| 34 | #define DEFAULT_CONVERTER SRC_SINC_MEDIUM_QUALITY |
| 35 | |
| 36 | #define BUFFER_LEN 1024 |
| 37 | #define INPUT_STEP_SIZE 8 |
| 38 | |
| 39 | typedef struct |
| 40 | { sf_count_t index ; |
| 41 | double ratio ; |
| 42 | } TIMEWARP_FACTOR ; |
| 43 | |
| 44 | static void usage_exit (const char *progname) ; |
| 45 | static sf_count_t timewarp_convert (SNDFILE *infile, SNDFILE *outfile, int converter, int channels) ; |
| 46 | |
| 47 | int |
| 48 | main (int argc, char *argv []) |
| 49 | { SNDFILE *infile, *outfile ; |
| 50 | SF_INFO sfinfo ; |
| 51 | sf_count_t count ; |
| 52 | |
| 53 | if (argc != 3) |
| 54 | usage_exit (argv [0]) ; |
| 55 | |
| 56 | putchar ('\n') ; |
| 57 | printf ("Input File : %s\n", argv [argc - 2]) ; |
| 58 | if ((infile = sf_open (argv [argc - 2], SFM_READ, &sfinfo)) == NULL) |
| 59 | { printf ("Error : Not able to open input file '%s'\n", argv [argc - 2]) ; |
| 60 | exit (1) ; |
| 61 | } ; |
| 62 | |
| 63 | if (INPUT_STEP_SIZE * sfinfo.channels > BUFFER_LEN) |
| 64 | { printf ("\n\nError : INPUT_STEP_SIZE * sfinfo.channels > BUFFER_LEN\n\n") ; |
| 65 | exit (1) ; |
| 66 | } ; |
| 67 | |
| 68 | |
| 69 | /* Delete the output file length to zero if already exists. */ |
| 70 | remove (argv [argc - 1]) ; |
| 71 | |
| 72 | if ((outfile = sf_open (argv [argc - 1], SFM_WRITE, &sfinfo)) == NULL) |
| 73 | { printf ("Error : Not able to open output file '%s'\n", argv [argc - 1]) ; |
| 74 | sf_close (infile) ; |
| 75 | exit (1) ; |
| 76 | } ; |
| 77 | |
| 78 | sf_command (outfile, SFC_SET_CLIPPING, NULL, SF_TRUE) ; |
| 79 | |
| 80 | printf ("Output file : %s\n", argv [argc - 1]) ; |
| 81 | printf ("Converter : %s\n", src_get_name (DEFAULT_CONVERTER)) ; |
| 82 | |
| 83 | count = timewarp_convert (infile, outfile, DEFAULT_CONVERTER, sfinfo.channels) ; |
| 84 | |
| 85 | printf ("Output Frames : %ld\n\n", (long) count) ; |
| 86 | |
| 87 | sf_close (infile) ; |
| 88 | sf_close (outfile) ; |
| 89 | |
| 90 | return 0 ; |
| 91 | } /* main */ |
| 92 | |
| 93 | /*============================================================================== |
| 94 | */ |
| 95 | |
| 96 | static TIMEWARP_FACTOR warp [] = |
| 97 | { { 0 , 1.00000001 }, |
| 98 | { 20000 , 1.01000000 }, |
| 99 | { 20200 , 1.00000001 }, |
| 100 | { 40000 , 1.20000000 }, |
| 101 | { 40300 , 1.00000001 }, |
| 102 | { 60000 , 1.10000000 }, |
| 103 | { 60400 , 1.00000001 }, |
| 104 | { 80000 , 1.50000000 }, |
| 105 | { 81000 , 1.00000001 }, |
| 106 | } ; |
| 107 | |
| 108 | static sf_count_t |
| 109 | timewarp_convert (SNDFILE *infile, SNDFILE *outfile, int converter, int channels) |
| 110 | { static float input [BUFFER_LEN] ; |
| 111 | static float output [BUFFER_LEN] ; |
| 112 | |
| 113 | SRC_STATE *src_state ; |
| 114 | SRC_DATA src_data ; |
| 115 | int error, warp_index = 0 ; |
| 116 | sf_count_t input_count = 0, output_count = 0 ; |
| 117 | |
| 118 | sf_seek (infile, 0, SEEK_SET) ; |
| 119 | sf_seek (outfile, 0, SEEK_SET) ; |
| 120 | |
| 121 | /* Initialize the sample rate converter. */ |
| 122 | if ((src_state = src_new (converter, channels, &error)) == NULL) |
| 123 | { printf ("\n\nError : src_new() failed : %s.\n\n", src_strerror (error)) ; |
| 124 | exit (1) ; |
| 125 | } ; |
| 126 | |
| 127 | src_data.end_of_input = 0 ; /* Set this later. */ |
| 128 | |
| 129 | /* Start with zero to force load in while loop. */ |
| 130 | src_data.input_frames = 0 ; |
| 131 | src_data.data_in = input ; |
| 132 | |
| 133 | if (warp [0].index > 0) |
| 134 | src_data.src_ratio = 1.0 ; |
| 135 | else |
| 136 | { src_data.src_ratio = warp [0].ratio ; |
| 137 | warp_index ++ ; |
| 138 | } ; |
| 139 | |
| 140 | src_data.data_out = output ; |
| 141 | src_data.output_frames = BUFFER_LEN /channels ; |
| 142 | |
| 143 | while (1) |
| 144 | { |
| 145 | if (warp_index < ARRAY_LEN (warp) - 1 && input_count >= warp [warp_index].index) |
| 146 | { src_data.src_ratio = warp [warp_index].ratio ; |
| 147 | warp_index ++ ; |
| 148 | } ; |
| 149 | |
| 150 | /* If the input buffer is empty, refill it. */ |
| 151 | if (src_data.input_frames == 0) |
| 152 | { src_data.input_frames = sf_readf_float (infile, input, INPUT_STEP_SIZE) ; |
| 153 | input_count += src_data.input_frames ; |
| 154 | src_data.data_in = input ; |
| 155 | |
| 156 | /* The last read will not be a full buffer, so snd_of_input. */ |
| 157 | if (src_data.input_frames < INPUT_STEP_SIZE) |
| 158 | src_data.end_of_input = SF_TRUE ; |
| 159 | } ; |
| 160 | |
| 161 | /* Process current block. */ |
| 162 | if ((error = src_process (src_state, &src_data))) |
| 163 | { printf ("\nError : %s\n", src_strerror (error)) ; |
| 164 | exit (1) ; |
| 165 | } ; |
| 166 | |
| 167 | /* Terminate if done. */ |
| 168 | if (src_data.end_of_input && src_data.output_frames_gen == 0) |
| 169 | break ; |
| 170 | |
| 171 | /* Write output. */ |
| 172 | sf_writef_float (outfile, output, src_data.output_frames_gen) ; |
| 173 | output_count += src_data.output_frames_gen ; |
| 174 | |
| 175 | src_data.data_in += src_data.input_frames_used * channels ; |
| 176 | src_data.input_frames -= src_data.input_frames_used ; |
| 177 | } ; |
| 178 | |
| 179 | src_state = src_delete (src_state) ; |
| 180 | |
| 181 | return output_count ; |
| 182 | } /* timewarp_convert */ |
| 183 | |
| 184 | /*------------------------------------------------------------------------------ |
| 185 | */ |
| 186 | |
| 187 | static void |
| 188 | usage_exit (const char *progname) |
| 189 | { const char *cptr ; |
| 190 | |
| 191 | if ((cptr = strrchr (progname, '/')) != NULL) |
| 192 | progname = cptr + 1 ; |
| 193 | |
| 194 | if ((cptr = strrchr (progname, '\\')) != NULL) |
| 195 | progname = cptr + 1 ; |
| 196 | |
| 197 | printf ("\n" |
| 198 | " A program demonstrating the time warping capabilities of libsamplerate." |
| 199 | " It uses libsndfile for file I/O and Secret Rabbit Code (aka libsamplerate)" |
| 200 | " for performing the warping.\n" |
| 201 | " It works on any file format supported by libsndfile with any \n" |
| 202 | " number of channels (limited only by host memory).\n" |
| 203 | "\n" |
| 204 | " The warping is dependant on a table hard code into the source code.\n" |
| 205 | "\n" |
| 206 | " libsamplerate version : %s\n" |
| 207 | "\n" |
| 208 | " Usage : \n" |
| 209 | " %s <input file> <output file>\n" |
| 210 | "\n", src_get_version (), progname) ; |
| 211 | |
| 212 | puts ("") ; |
| 213 | |
| 214 | exit (1) ; |
| 215 | } /* usage_exit */ |
| 216 | |
| 217 | /*============================================================================== |
| 218 | */ |
| 219 | |
| 220 | #else /* (HAVE_SNFILE == 0) */ |
| 221 | |
| 222 | /* Alternative main function when libsndfile is not available. */ |
| 223 | |
| 224 | int |
| 225 | main (void) |
| 226 | { puts ( |
| 227 | "\n" |
| 228 | "****************************************************************\n" |
| 229 | " This example program was compiled without libsndfile \n" |
| 230 | " (http://www.mega-nerd.com/libsndfile/).\n" |
| 231 | " It is therefore completely broken and non-functional.\n" |
| 232 | "****************************************************************\n" |
| 233 | "\n" |
| 234 | ) ; |
| 235 | |
| 236 | return 0 ; |
| 237 | } /* main */ |
| 238 | |
| 239 | #endif |
| 240 | |