public static WavpackContext WavpackOpenFileInput(java.io.DataInputStream infile) {
WavpackContext wpc = new WavpackContext();
WavpackStream wps = wpc.stream;
wpc.infile = infile;
wpc.total_samples = -1;
wpc.norm_offset = 0;
wpc.open_flags = 0;
// open the source file for reading and store the size
while (wps.wphdr.block_samples == 0) {
wps.wphdr = read_next_header(wpc.infile, wps.wphdr);
if (wps.wphdr.status == 1) {
wpc.error_message = "not compatible with this version of WavPack file!";
wpc.error = true;
return (wpc);
}
if (wps.wphdr.block_samples > 0 && wps.wphdr.total_samples != -1) {
wpc.total_samples = wps.wphdr.total_samples;
}
// lets put the stream back in the context
wpc.stream = wps;
if ((UnpackUtils.unpack_init(wpc)) == Defines.FALSE) {
wpc.error = true;
return wpc;
}
} // end of while
wpc.config.flags = wpc.config.flags & ~0xff;
wpc.config.flags = wpc.config.flags | (wps.wphdr.flags & 0xff);
wpc.config.bytes_per_sample = (int) ((wps.wphdr.flags & Defines.BYTES_STORED) + 1);
wpc.config.float_norm_exp = wps.float_norm_exp;
wpc.config.bits_per_sample =
(int)
((wpc.config.bytes_per_sample * 8)
- ((wps.wphdr.flags & Defines.SHIFT_MASK) >> Defines.SHIFT_LSB));
if ((wpc.config.flags & Defines.FLOAT_DATA) > 0) {
wpc.config.bytes_per_sample = 3;
wpc.config.bits_per_sample = 24;
}
if (wpc.config.sample_rate == 0) {
if (wps.wphdr.block_samples == 0
|| (wps.wphdr.flags & Defines.SRATE_MASK) == Defines.SRATE_MASK)
wpc.config.sample_rate = 44100;
else
wpc.config.sample_rate =
sample_rates[(int) ((wps.wphdr.flags & Defines.SRATE_MASK) >> Defines.SRATE_LSB)];
}
if (wpc.config.num_channels == 0) {
if ((wps.wphdr.flags & Defines.MONO_FLAG) > 0) {
wpc.config.num_channels = 1;
} else {
wpc.config.num_channels = 2;
}
wpc.config.channel_mask = 0x5 - wpc.config.num_channels;
}
if ((wps.wphdr.flags & Defines.FINAL_BLOCK) == 0) {
if ((wps.wphdr.flags & Defines.MONO_FLAG) != 0) {
wpc.reduced_channels = 1;
} else {
wpc.reduced_channels = 2;
}
}
return wpc;
}
public static long WavpackUnpackSamples(WavpackContext wpc, int[] buffer, long samples) {
WavpackStream wps = wpc.stream;
long samples_unpacked = 0, samples_to_unpack;
int num_channels = wpc.config.num_channels;
int bcounter = 0;
int[] temp_buffer = new int[Defines.SAMPLE_BUFFER_SIZE];
int buf_idx = 0;
int bytes_returned = 0;
while (samples > 0) {
if (wps.wphdr.block_samples == 0
|| (wps.wphdr.flags & Defines.INITIAL_BLOCK) == 0
|| wps.sample_index >= wps.wphdr.block_index + wps.wphdr.block_samples) {
wps.wphdr = read_next_header(wpc.infile, wps.wphdr);
if (wps.wphdr.status == 1) break;
if (wps.wphdr.block_samples == 0 || wps.sample_index == wps.wphdr.block_index) {
if ((UnpackUtils.unpack_init(wpc)) == Defines.FALSE) break;
}
}
if (wps.wphdr.block_samples == 0
|| (wps.wphdr.flags & Defines.INITIAL_BLOCK) == 0
|| wps.sample_index >= wps.wphdr.block_index + wps.wphdr.block_samples) continue;
if (wps.sample_index < wps.wphdr.block_index) {
samples_to_unpack = wps.wphdr.block_index - wps.sample_index;
if (samples_to_unpack > samples) samples_to_unpack = samples;
wps.sample_index += samples_to_unpack;
samples_unpacked += samples_to_unpack;
samples -= samples_to_unpack;
if (wpc.reduced_channels > 0) samples_to_unpack *= wpc.reduced_channels;
else samples_to_unpack *= num_channels;
while (samples_to_unpack > 0) {
temp_buffer[bcounter] = 0;
bcounter++;
samples_to_unpack--;
}
continue;
}
samples_to_unpack = wps.wphdr.block_index + wps.wphdr.block_samples - wps.sample_index;
if (samples_to_unpack > samples) samples_to_unpack = samples;
UnpackUtils.unpack_samples(wpc, temp_buffer, samples_to_unpack);
if (wpc.reduced_channels > 0)
bytes_returned = (int) (samples_to_unpack * wpc.reduced_channels);
else bytes_returned = (int) (samples_to_unpack * num_channels);
System.arraycopy(temp_buffer, 0, buffer, buf_idx, bytes_returned);
buf_idx += bytes_returned;
samples_unpacked += samples_to_unpack;
samples -= samples_to_unpack;
if (wps.sample_index == wps.wphdr.block_index + wps.wphdr.block_samples) {
if (UnpackUtils.check_crc_error(wpc) > 0) wpc.crc_errors++;
}
if (wps.sample_index == wpc.total_samples) break;
}
return (samples_unpacked);
}