// Returns 0 if successful
// Returns -1 if unsuccessful
static int init_header_info(twolame_options * glopts)
{
frame_header *header = &glopts->header;
/* use the options to create header info structure */
header->lay = 2;
header->error_protection = glopts->error_protection;
header->version = glopts->version;
// Convert the sampling frequency to the required index
header->samplerate_idx = twolame_get_samplerate_index(glopts->samplerate_out);
if (header->samplerate_idx < 0) {
fprintf(stderr, "Not a valid samplerate: %i\n", glopts->samplerate_out);
return -1;
}
// Convert the bitrate to the an index
if (glopts->freeformat)
header->bitrate_index = 0;
else
{
header->bitrate_index = twolame_get_bitrate_index(glopts->bitrate, header->version);
if (header->bitrate_index < 0) {
fprintf(stderr, "Not a valid bitrate (%i) for MPEG version '%s'\n", glopts->bitrate,
twolame_mpeg_version_name(glopts->version));
return -1;
}
}
if (glopts->vbr && glopts->vbr_max_bitrate > 0)
{
/* user required vbr and a specified max bitrate */
/* convert max VBR bitrate to an index */
glopts->vbr_upper_index = twolame_get_bitrate_index(glopts->vbr_max_bitrate, header->version);
if (glopts->vbr_upper_index < 0) {
fprintf(stderr, "Not a valid max VBR bitrate for this version: %i\n",
glopts->vbr_max_bitrate);
return -1;
}
}
// Copy accross the other settings
header->padding = 0; /* when requested, padding will be evaluated later for this frame */
header->private_extension = glopts->private_extension;
header->mode = glopts->mode;
header->mode_ext = 0;
header->copyright = glopts->copyright;
header->original = glopts->original;
header->emphasis = glopts->emphasis;
return 0;
}
// Returns 0 if successful
// Returns -1 if unsuccessful
static int init_header_info( twolame_options *glopts ) {
frame_header *header = &glopts->header;
/* use the options to create header info structure */
header->lay = 2;
header->error_protection = glopts->error_protection;
header->version = glopts->version;
// Convert the sampling frequency to the required index
header->samplerate_idx = twolame_get_samplerate_index( glopts->samplerate_out );
if (header->samplerate_idx < 0) {
fprintf(stdout,"Not a valid samplerate: %i\n",glopts->samplerate_out );
return -1;
}
// Convert the bitrate to the an index
header->bitrate_index = twolame_get_bitrate_index(glopts->bitrate, header->version);
if (header->bitrate_index < 0) {
fprintf(stdout,"Not a valid bitrate (%i) for MPEG version '%s'\n", glopts->bitrate,
twolame_mpeg_version_name(glopts->version));
return -1;
}
// Convert the max VBR bitrate to the an index
glopts->vbr_upper_index = twolame_get_bitrate_index(glopts->vbr_max_bitrate, header->version);
if (glopts->vbr_upper_index < 0) {
fprintf(stdout,"Not a valid max VBR bitrate for this version: %i\n",glopts->vbr_max_bitrate);
return -1;
}
// Copy accross the other settings
header->padding = glopts->padding;
header->private_bit = glopts->private_bit;
header->mode = glopts->mode;
header->mode_ext = 0;
header->copyright = glopts->copyright;
header->original = glopts->original;
header->emphasis = glopts->emphasis;
return 0;
}