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99 lines
2.2 KiB
C++
99 lines
2.2 KiB
C++
#include "wav_source.hpp"
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#include "../../stream/servers/file_stream.hpp"
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#include <stdexcept>
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using namespace Mangle::Stream;
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using namespace Mangle::Sound;
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static void fail(const std::string &msg)
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{ throw std::runtime_error("Mangle::Wav exception: " + msg); }
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void WavSource::getInfo(int32_t *pRate, int32_t *pChannels, int32_t *pBits)
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{
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// Use the values we found in the constructor
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*pRate = rate;
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*pChannels = channels;
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*pBits = bits;
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}
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void WavSource::seek(size_t pos)
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{
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// Seek the stream and set 'left'
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assert(isSeekable);
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if(pos > total) pos = total;
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input->seek(dataOffset + pos);
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left = total-pos;
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}
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size_t WavSource::read(void *data, size_t length)
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{
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if(length > left)
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length = left;
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size_t read = input->read(data, length);
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if(read < length)
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// Something went wrong
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fail("WAV read error");
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return length;
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}
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void WavSource::open(Mangle::Stream::StreamPtr data)
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{
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input = data;
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hasPosition = true;
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hasSize = true;
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// If we can check position and seek in the input stream, then we
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// can seek the wav data too.
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isSeekable = input->isSeekable && input->hasPosition;
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// Read header
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unsigned int val;
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input->read(&val,4); // header
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if(val != 0x46464952) // "RIFF"
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fail("Not a WAV file");
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input->read(&val,4); // size (ignored)
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input->read(&val,4); // file format
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if(val != 0x45564157) // "WAVE"
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fail("Not a valid WAV file");
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input->read(&val,4); // "fmt "
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input->read(&val,4); // chunk size (must be 16)
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if(val != 16)
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fail("Unsupported WAV format");
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input->read(&val,2);
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if(val != 1)
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fail("Non-PCM (compressed) WAV files not supported");
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// Sound data specification
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channels = 0;
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input->read(&channels,2);
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input->read(&rate, 4);
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// Skip next 6 bytes
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input->read(&val, 4);
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input->read(&val, 2);
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// Bits per sample
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bits = 0;
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input->read(&bits,2);
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input->read(&val,4); // Data header
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if(val != 0x61746164) // "data"
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fail("Expected data block");
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// Finally, read the data size
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input->read(&total,4);
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left = total;
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// Store the beginning of the data block for later
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if(input->hasPosition)
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dataOffset = input->tell();
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}
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WavSource::WavSource(const std::string &file)
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{ open(StreamPtr(new FileStream(file))); }
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