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made "serialize" const

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badaix 2015-07-26 13:06:21 +02:00
parent 56389ad202
commit b936bffeff
11 changed files with 104 additions and 73 deletions
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35
message/sampleFormat.h
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@ -25,16 +25,17 @@
namespace msg
{
// sample and frame as defined in alsa:
// http://www.alsa-project.org/main/index.php/FramesPeriods
// Say we want to work with a stereo, 16-bit, 44.1 KHz stream, one-way (meaning, either in playback or in capture direction). Then we have:
// 'stereo' = number of channels: 2
// 1 analog sample is represented with 16 bits = 2 bytes
// 1 frame represents 1 analog sample from all channels; here we have 2 channels, and so:
// 1 frame = (num_channels) * (1 sample in bytes) = (2 channels) * (2 bytes (16 bits) per sample) = 4 bytes (32 bits)
// To sustain 2x 44.1 KHz analog rate - the system must be capable of data transfer rate, in Bytes/sec:
// Bps_rate = (num_channels) * (1 sample in bytes) * (analog_rate) = (1 frame) * (analog_rate) = ( 2 channels ) * (2 bytes/sample) * (44100 samples/sec) = 2*2*44100 = 176400 Bytes/sec (link to formula img)
/**
* sample and frame as defined in alsa:
* http://www.alsa-project.org/main/index.php/FramesPeriods
* Say we want to work with a stereo, 16-bit, 44.1 KHz stream, one-way (meaning, either in playback or in capture direction). Then we have:
* 'stereo' = number of channels: 2
* 1 analog sample is represented with 16 bits = 2 bytes
* 1 frame represents 1 analog sample from all channels; here we have 2 channels, and so:
* 1 frame = (num_channels) * (1 sample in bytes) = (2 channels) * (2 bytes (16 bits) per sample) = 4 bytes (32 bits)
* To sustain 2x 44.1 KHz analog rate - the system must be capable of data transfer rate, in Bytes/sec:
* Bps_rate = (num_channels) * (1 sample in bytes) * (analog_rate) = (1 frame) * (analog_rate) = ( 2 channels ) * (2 bytes/sample) * (44100 samples/sec) = 2*2*44100 = 176400 Bytes/sec (link to formula img)
*/
class SampleFormat : public BaseMessage
{
public:
@ -79,19 +80,19 @@ public:
stream.read(reinterpret_cast<char *>(&frameSize), sizeof(uint16_t));
}
virtual uint32_t getSize()
virtual uint32_t getSize() const
{
return sizeof(int32_t) + 4*sizeof(int16_t);
}
protected:
virtual void doserialize(std::ostream& stream)
virtual void doserialize(std::ostream& stream) const
{
stream.write(reinterpret_cast<char *>(&rate), sizeof(uint32_t));
stream.write(reinterpret_cast<char *>(&bits), sizeof(uint16_t));
stream.write(reinterpret_cast<char *>(&channels), sizeof(uint16_t));
stream.write(reinterpret_cast<char *>(&sampleSize), sizeof(uint16_t));
stream.write(reinterpret_cast<char *>(&frameSize), sizeof(uint16_t));
stream.write(reinterpret_cast<const char *>(&rate), sizeof(uint32_t));
stream.write(reinterpret_cast<const char *>(&bits), sizeof(uint16_t));
stream.write(reinterpret_cast<const char *>(&channels), sizeof(uint16_t));
stream.write(reinterpret_cast<const char *>(&sampleSize), sizeof(uint16_t));
stream.write(reinterpret_cast<const char *>(&frameSize), sizeof(uint16_t));
}
};