static switch_status_t switch_adpcm_init(switch_codec_t *codec, switch_codec_flag_t flags, const switch_codec_settings_t *codec_settings)
{
uint32_t encoding, decoding;
struct ima_adpcm_context *context = NULL;
encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
decoding = (flags & SWITCH_CODEC_FLAG_DECODE);
if (!(encoding || decoding) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(*context))))) {
return SWITCH_STATUS_FALSE;
} else {
if (encoding) {
context->encoder_object = ima_adpcm_init(context->encoder_object, IMA_ADPCM_DVI4, 0);
}
if (decoding) {
context->decoder_object = ima_adpcm_init(context->decoder_object, IMA_ADPCM_DVI4, 0);
}
codec->private_info = context;
return SWITCH_STATUS_SUCCESS;
}
}
int main(int argc, char *argv[])
{
int i;
SNDFILE *inhandle;
SNDFILE *outhandle;
int frames;
int dec_frames;
int outframes;
int ima_bytes;
double pre_energy;
double post_energy;
double diff_energy;
int16_t pre_amp[HIST_LEN];
int16_t post_amp[HIST_LEN];
uint8_t ima_data[HIST_LEN];
int16_t history[HIST_LEN];
int hist_in;
int hist_out;
ima_adpcm_state_t *ima_enc_state;
ima_adpcm_state_t *ima_dec_state;
int xx;
int total_pre_samples;
int total_compressed_bytes;
int total_post_samples;
const char *in_file_name;
int variant;
int chunk_size;
int enc_chunk_size;
int log_encoded_data;
int opt;
variant = IMA_ADPCM_DVI4;
in_file_name = IN_FILE_NAME;
chunk_size = 160;
enc_chunk_size = 0;
log_encoded_data = FALSE;
while ((opt = getopt(argc, argv, "ac:i:lv")) != -1)
{
switch (opt)
{
case 'a':
variant = IMA_ADPCM_IMA4;
chunk_size = 505;
break;
case 'c':
enc_chunk_size = atoi(optarg);
break;
case 'i':
in_file_name = optarg;
break;
case 'l':
log_encoded_data = TRUE;
break;
case 'v':
variant = IMA_ADPCM_VDVI;
break;
default:
//usage();
exit(2);
break;
}
}
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 ((outhandle = sf_open_telephony_write(OUT_FILE_NAME, 1)) == NULL)
{
fprintf(stderr, " Cannot create audio file '%s'\n", OUT_FILE_NAME);
exit(2);
}
if ((ima_enc_state = ima_adpcm_init(NULL, variant, enc_chunk_size)) == NULL)
{
fprintf(stderr, " Cannot create encoder\n");
exit(2);
}
if ((ima_dec_state = ima_adpcm_init(NULL, variant, enc_chunk_size)) == NULL)
{
fprintf(stderr, " Cannot create decoder\n");
exit(2);
}
hist_in = 0;
hist_out = 0;
pre_energy = 0.0;
post_energy = 0.0;
diff_energy = 0.0;
total_pre_samples = 0;
total_compressed_bytes = 0;
total_post_samples = 0;
while ((frames = sf_readf_short(inhandle, pre_amp, chunk_size)))
{
total_pre_samples += frames;
ima_bytes = ima_adpcm_encode(ima_enc_state, ima_data, pre_amp, frames);
if (log_encoded_data)
write(1, ima_data, ima_bytes);
total_compressed_bytes += ima_bytes;
dec_frames = ima_adpcm_decode(ima_dec_state, post_amp, ima_data, ima_bytes);
total_post_samples += dec_frames;
for (i = 0; i < frames; i++)
{
history[hist_in++] = pre_amp[i];
if (hist_in >= HIST_LEN)
hist_in = 0;
pre_energy += (double) pre_amp[i] * (double) pre_amp[i];
}
for (i = 0; i < dec_frames; i++)
{
post_energy += (double) post_amp[i] * (double) post_amp[i];
xx = post_amp[i] - history[hist_out++];
if (hist_out >= HIST_LEN)
hist_out = 0;
diff_energy += (double) xx * (double) xx;
}
outframes = sf_writef_short(outhandle, post_amp, dec_frames);
}
if (sf_close_telephony(inhandle))
{
fprintf(stderr, " Cannot close audio file '%s'\n", in_file_name);
exit(2);
}
if (sf_close_telephony(outhandle))
{
fprintf(stderr, " Cannot close audio file '%s'\n", OUT_FILE_NAME);
exit(2);
}
ima_adpcm_release(ima_enc_state);
ima_adpcm_release(ima_dec_state);
printf("Pre samples: %d\n", total_pre_samples);
printf("Compressed bytes: %d\n", total_compressed_bytes);
printf("Post samples: %d\n", total_post_samples);
printf("Output energy is %f%% of input energy.\n", 100.0*post_energy/pre_energy);
printf("Residual energy is %f%% of the total.\n", 100.0*diff_energy/post_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;
}