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Implemented function for querying the average bitrate of all stream files associated with a VGMSTREAM instance

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This commit is contained in:
Chris Moeller 2015-02-08 19:01:26 -08:00
parent 3a842dfd2c
commit 2c5e8a1421
2 changed files with 40 additions and 0 deletions
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36
src/vgmstream.c
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@ -3307,3 +3307,39 @@ void try_dual_file_stereo(VGMSTREAM * opened_stream, STREAMFILE *streamFile) {
fail:
return;
}
static int get_vgmstream_channel_average_bitrate(VGMSTREAMCHANNEL * channel, int sample_rate, int length_samples)
{
return (int)((int64_t)get_streamfile_size(channel->streamfile) * 8 * sample_rate / length_samples);
}
int get_vgmstream_average_bitrate(VGMSTREAM * vgmstream)
{
char path_current[PATH_LIMIT];
char path_compare[PATH_LIMIT];
unsigned int i, j;
int bitrate = 0;
int sample_rate = vgmstream->sample_rate;
int length_samples = vgmstream->num_samples;
if (vgmstream->channels >= 1)
bitrate += get_vgmstream_channel_average_bitrate(&vgmstream->ch[0], sample_rate, length_samples);
for (i = 1; i < vgmstream->channels; ++i)
{
VGMSTREAMCHANNEL * ch = &vgmstream->ch[i];
ch->streamfile->get_name(ch->streamfile, path_current, sizeof(path_current));
for (j = 0; j < i; ++j)
{
VGMSTREAMCHANNEL * chc = &vgmstream->ch[j];
chc->streamfile->get_name(chc->streamfile, path_compare, sizeof(path_compare));
if (!strcmp(path_current, path_compare))
break;
}
if (j == i)
bitrate += get_vgmstream_channel_average_bitrate(ch, sample_rate, length_samples);
}
return bitrate;
}

4
src/vgmstream.h
View File

@ -889,4 +889,8 @@ void describe_vgmstream(VGMSTREAM * vgmstream, char * desc, int length);
* stereo stream. */
void try_dual_file_stereo(VGMSTREAM * opened_stream, STREAMFILE *streamFile);
/* Return the average bitrate in bps of all unique files contained within this
* stream. Compares files by absolute paths. */
int get_vgmstream_average_bitrate(VGMSTREAM * vgmstream);
#endif