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/*
Copyright (C) 2010-2022 The Exult Team
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "pent_include.h"
#include "WavAudioSample.h"
#include "databuf.h"
#include <cstring>
#ifdef __GNUC__
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wold-style-cast"
# pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
#endif // __GNUC__
#include <SDL.h>
#ifdef __GNUC__
# pragma GCC diagnostic pop
#endif // __GNUC__
using namespace Pentagram;
WavAudioSample::WavAudioSample(std::unique_ptr<uint8[]> buffer_, uint32 size)
: RawAudioSample(std::move(buffer_), 0, 0, false, false) {
uint32 pos_fmt = 0;
uint32 size_fmt = 0;
uint32 pos_data = 0;
uint32 size_data = 0;
IBufferDataView ds(buffer, size);
char buf[4];
ds.seek(0);
ds.read(buf, 4);
if (std::memcmp(buf, "RIFF", 4) != 0) {
return;
}
const uint32 riff_size = ds.read4();
if (riff_size != size - 8) {
return;
}
ds.read(buf, 4);
if (std::memcmp(buf, "WAVE", 4) != 0) {
return;
}
while (ds.getPos() < riff_size + 8) {
ds.read(buf, 4);
const uint32 chunk_size = ds.read4();
if (!std::memcmp(buf, "fmt ", 4)) {
pos_fmt = ds.getPos();
size_fmt = chunk_size;
if (pos_data) {
break;
}
} else if (!std::memcmp(buf, "data", 4)) {
pos_data = ds.getPos();
size_data = chunk_size;
if (pos_fmt) {
break;
}
}
ds.skip(chunk_size);
}
if (!pos_fmt || !pos_data || size_fmt < 0x10) {
return;
}
ds.seek(pos_fmt);
const uint16 format_tag = ds.read2();
const uint16 channels = ds.read2();
sample_rate = ds.read4();
// uint32 bytes_per_second = ds.read4();
// uint16 block_align = ds.read2();
ds.skip(6);
const uint16 bits_per_sample = ds.read2();
// uint16 extra_bytes = ds.read2();
ds.skip(2);
if (format_tag != 1) {
return;
}
if (channels != 1 && channels != 2) {
return;
}
if (bits_per_sample != 16 && bits_per_sample != 8) {
return;
}
stereo = channels == 2;
bits = bits_per_sample;
buffer_limit = pos_data + size_data;
start_pos = pos_data;
length = size_data / (bits_per_sample / (stereo ? 4 : 8));
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
byte_swap = false;
#else
byte_swap = true;
#endif
signeddata = bits == 16;
}
bool WavAudioSample::isThis(IDataSource* ds) {
char buf[4];
ds->seek(0);
ds->read(buf, 4);
if (std::memcmp(buf, "RIFF", 4) != 0) {
return false;
}
const uint32 riff_size = ds->read4();
if (riff_size != ds->getAvail()) {
return false;
}
ds->read(buf, 4);
if (std::memcmp(buf, "WAVE", 4) != 0) {
return false;
}
uint32 pos_fmt = 0;
uint32 size_fmt = 0;
uint32 pos_data = 0;
// uint32 size_data = 0;
while (ds->getAvail() > 0) {
ds->read(buf, 4);
const uint32 chunk_size = ds->read4();
if (!std::memcmp(buf, "fmt ", 4)) {
pos_fmt = ds->getPos();
size_fmt = chunk_size;
if (pos_data) {
break;
}
} else if (!std::memcmp(buf, "data", 4)) {
if (pos_data) {
return false;
}
pos_data = ds->getPos();
// size_data = chunk_size;
if (pos_fmt) {
break;
}
}
ds->skip(chunk_size);
}
if (!pos_fmt || !pos_data || size_fmt < 0x10) {
return false;
}
ds->seek(pos_fmt);
const uint16 format_tag = ds->read2();
const uint16 channels = ds->read2();
// uint32 sample_rate = ds->read4();
// uint32 bytes_per_second = ds->read4();;
// uint16 block_align = ds->read2();
ds->skip(10);
const uint16 bits_per_sample = ds->read2();
// uint16 extra_bytes = ds->read2();
ds->skip(2);
if (format_tag != 1) {
return false;
}
if (channels != 1 && channels != 2) {
return false;
}
if (bits_per_sample != 16 && bits_per_sample != 8) {
return false;
}
return true;
}
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