freeswitch/libs/spandsp/tests/lpc10_tests.c

/*
 * SpanDSP - a series of DSP components for telephony
 *
 * lpc10_tests.c - Test the LPC10 low bit rate speech codec.
 *
 * Written by Steve Underwood <steveu@coppice.org>
 *
 * Copyright (C) 2006 Steve Underwood
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2, as
 * published by the Free Software Foundation.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*! \file */

/*! \page lpc10_tests_page LPC10 codec tests
\section lpc10_tests_page_sec_1 What does it do?

\section lpc10_tests_page_sec_2 How is it used?
To perform a general audio quality test, lpc10 should be run. The file ../test-data/local/dam9.wav
will be compressed to LPC10 data, decompressed, and the resulting audio stored in post_lpc10.wav.
*/

#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#include <sndfile.h>

#include "spandsp.h"
#include "spandsp-sim.h"

#define BLOCK_LEN       180

#define BLOCKS_PER_READ 5

#define IN_FILE_NAME            "../test-data/local/dam9.wav"
#define REF_FILE_NAME           "../test-data/local/dam9_lpc55.wav"
#define COMPRESS_FILE_NAME      "lpc10_out.lpc10"
#define DECOMPRESS_FILE_NAME    "lpc10_in.lpc10"
#define OUT_FILE_NAME           "post_lpc10.wav"

int main(int argc, char *argv[])
{
    SNDFILE *inhandle;
    SNDFILE *refhandle;
    SNDFILE *outhandle;
    int frames;
    double pre_energy;
    double post_energy;
    double ref_energy;
    double diff_energy;
    int16_t pre_amp[BLOCKS_PER_READ*BLOCK_LEN];
    int16_t post_amp[BLOCKS_PER_READ*BLOCK_LEN];
    int16_t ref_amp[BLOCKS_PER_READ*BLOCK_LEN];
    int16_t log_amp[BLOCKS_PER_READ*BLOCK_LEN*3];
    uint8_t lpc10_data[BLOCKS_PER_READ*7];
    double xx;
    lpc10_encode_state_t *lpc10_enc_state;
    lpc10_decode_state_t *lpc10_dec_state;
    int i;
    int block_no;
    bool log_error;
    bool compress;
    bool decompress;
    const char *in_file_name;
    int compress_file;
    int decompress_file;
    int len;
    int opt;
    int enc_len;
    int dec_len;

    compress = false;
    decompress = false;
    log_error = true;
    in_file_name = IN_FILE_NAME;
    while ((opt = getopt(argc, argv, "cdi:l")) != -1)
    {
        switch (opt)
        {
        case 'c':
            compress = true;
            break;
        case 'd':
            decompress = true;
            break;
        case 'i':
            in_file_name = optarg;
            break;
        case 'l':
            log_error = false;
            break;
        default:
            //usage();
            exit(2);
        }
    }

    compress_file = -1;
    decompress_file = -1;
    inhandle = NULL;
    refhandle = NULL;
    outhandle = NULL;
    if (!decompress)
    {
        if ((inhandle = sf_open_telephony_read(in_file_name, 1)) == NULL)
        {
            fprintf(stderr, "    Cannot open audio file '%s'\n", in_file_name);
            exit(2);
        }

        if ((refhandle = sf_open_telephony_read(REF_FILE_NAME, 1)) == NULL)
        {
            fprintf(stderr, "    Cannot open audio file '%s'\n", REF_FILE_NAME);
            exit(2);
        }
    }
    else
    {
        if ((decompress_file = open(DECOMPRESS_FILE_NAME, O_RDONLY)) < 0)
        {
            fprintf(stderr, "    Cannot open decompressed data file '%s'\n", DECOMPRESS_FILE_NAME);
            exit(2);
        }
    }

    if ((outhandle = sf_open_telephony_write(OUT_FILE_NAME, 1)) == NULL)
    {
        fprintf(stderr, "    Cannot create audio file '%s'\n", OUT_FILE_NAME);
        exit(2);
    }

    if ((lpc10_enc_state = lpc10_encode_init(NULL, true)) == NULL)
    {
        fprintf(stderr, "    Cannot create encoder\n");
        exit(2);
    }

    if ((lpc10_dec_state = lpc10_decode_init(NULL, true)) == NULL)
    {
        fprintf(stderr, "    Cannot create decoder\n");
        exit(2);
    }

    if (compress)
    {
        if ((compress_file = open(COMPRESS_FILE_NAME, O_WRONLY | O_CREAT | O_TRUNC, 0666)) < 0)
        {
            fprintf(stderr, "    Cannot create compressed data file '%s'\n", COMPRESS_FILE_NAME);
            exit(2);
        }
    }

    pre_energy = 0.0;
    post_energy = 0.0;
    ref_energy = 0.0;
    diff_energy = 0.0;

    if (decompress)
    {
        while ((len = read(decompress_file, lpc10_data, BLOCKS_PER_READ*7)) > 0)
        {
            lpc10_decode(lpc10_dec_state, post_amp, lpc10_data, len/7);
            sf_writef_short(outhandle, post_amp, BLOCK_LEN*len/7);
        }
    }
    else
    {
        block_no = 0;
        while ((frames = sf_readf_short(inhandle, pre_amp, BLOCKS_PER_READ*BLOCK_LEN)) == BLOCKS_PER_READ*BLOCK_LEN
                &&
                (frames = sf_readf_short(refhandle, ref_amp, BLOCKS_PER_READ*BLOCK_LEN)) == BLOCKS_PER_READ*BLOCK_LEN)
        {
            enc_len = lpc10_encode(lpc10_enc_state, lpc10_data, pre_amp, BLOCKS_PER_READ*BLOCK_LEN);
            if (compress)
                write(compress_file, lpc10_data, enc_len);
            dec_len = lpc10_decode(lpc10_dec_state, post_amp, lpc10_data, enc_len);
            for (i = 0;  i < dec_len;  i++)
            {
                pre_energy += (double) pre_amp[i]*(double) pre_amp[i];
                post_energy += (double) post_amp[i]*(double) post_amp[i];
                ref_energy += (double) ref_amp[i]*(double) ref_amp[i];
                /* The reference file has some odd clipping, so eliminate this from the
                   energy measurement. */
                if (ref_amp[i] == 32767  ||  ref_amp[i] == -32768)
                    xx = 0.0;
                else
                    xx = post_amp[i] - ref_amp[i];
                diff_energy += (double) xx*(double) xx;
                log_amp[i] = xx;
            }
            block_no++;
            if (log_error)
                sf_writef_short(outhandle, log_amp, dec_len);
            else
                sf_writef_short(outhandle, post_amp, dec_len);
        }
        if (sf_close_telephony(inhandle))
        {
            fprintf(stderr, "    Cannot close audio file '%s'\n", in_file_name);
            exit(2);
        }
        if (sf_close_telephony(refhandle))
        {
            fprintf(stderr, "    Cannot close audio file '%s'\n", REF_FILE_NAME);
            exit(2);
        }
    }

    if (sf_close_telephony(outhandle))
    {
        fprintf(stderr, "    Cannot close audio file '%s'\n", OUT_FILE_NAME);
        exit(2);
    }
    if (compress)
        close(compress_file);
    if (decompress)
        close(decompress_file);
    lpc10_encode_free(lpc10_enc_state);
    lpc10_decode_free(lpc10_dec_state);

    if (!decompress)
    {
        printf("Output energy is %f%% of input energy.\n", 100.0*post_energy/pre_energy);
        printf("Difference energy is %f%% of the total.\n", 100.0*diff_energy/ref_energy);
        if (fabs(1.0 - post_energy/pre_energy) > 0.05
            ||
            fabs(diff_energy/post_energy) > 0.03)
        {
            printf("Tests failed.\n");
            exit(2);
        }
        printf("Tests passed.\n");
    }
    return 0;
}
/*- End of function --------------------------------------------------------*/
/*- End of file ------------------------------------------------------------*/