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Diffstat (limited to 'src/FSKSyncChannel_Generator.h')
| -rw-r--r-- | src/FSKSyncChannel_Generator.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/FSKSyncChannel_Generator.h b/src/FSKSyncChannel_Generator.h new file mode 100644 index 0000000..d038c83 --- /dev/null +++ b/src/FSKSyncChannel_Generator.h @@ -0,0 +1,151 @@ +/* +Copyright (c) 2013-2013, John Hurst +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions +are met: +1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. +2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. +3. The name of the author may not be used to endorse or promote products + derived from this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR +IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, +INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ +/*! \file FSKSyncChannel_Generator.h + \version $Id$ + \brief SMPTE ST 430-12 sync channel generator +*/ + +#ifndef _FSKSyncChannel_GENERATOR_H_ +#define _FSKSyncChannel_GENERATOR_H_ + +#include <AS_DCP.h> +#include "SyncEncoder.h" +#include "UUIDInformation.h" + +#define INT24_MAX 8388607.0 +#define INT24_MIN -8388608.0 + +namespace ASDCP +{ + namespace IAB + { + static const ui32_t SYNC_CHANNEL = 14; + } + + namespace PCM + { + + static const ui16_t NUM_BYTES_PER_INT24 = 3; + + class FSKSyncChannelGenerator + { + SYNCENCODER m_syncEncoder; + UUIDINFORMATION m_audioTrackUUID; + AudioDescriptor m_ADesc; + float *m_syncSignalBuffer; + ui32_t m_numSamplesPerFrame; + ui32_t m_currentFrameNumber; + ui32_t m_numBytesPerFrame; + bool m_isSyncEncoderInitialized; + + ASDCP_NO_COPY_CONSTRUCT(FSKSyncChannelGenerator); + + public: + /** + * Constructor + * + * @param bitsPerSample the number of bits in each sample of pcm data + * @param sampleRate the sampling rate + * @param editRate the edit rate of the associated picture track. + * @param uuid the UUID of the associated IAB track file. + * + */ + FSKSyncChannelGenerator(ui16_t bitsPerSample, ui32_t sampleRate, + const ASDCP::Rational& editRate, const byte_t* uuid); + ~FSKSyncChannelGenerator(); + + /** + * Set the frame number when seeking + * Use override the default starting frame number for a new track or + * to set the frame number when doing random access. + * + * @param frameNumber + * + */ + void setFrameNumber(ui32_t frameNumber) { m_currentFrameNumber = frameNumber; }; + + /** + * Get the number of bytes per frame. + * + * @return Number of bytes per frame + * + */ + ui32_t getBytesPerFrame() { return m_numBytesPerFrame; } + + /** + * Generates the next frame of sync data. + * Generates the next frame of sync data and places it + * the frame buffer. Fails if the buffer is too small. + * **Automatically increments the frame number.** + * + * @param buf the buffer that the generated frame data will be written to. + * + * @return Kumu::RESULT_OK if the buffer is succesfully filled with sync + * data for the next frame. + */ + Result_t ReadFrame(FrameBuffer& buf); + + /** + * Reset the frame count. + * + * @return Kumu::RESULT_OK + */ + Result_t Reset(); + + /** + * Fill the AudioDescriptor with the relevant information. + * + * @return Kumu::RESULT_OK + */ + Result_t FillAudioDescriptor(PCM::AudioDescriptor& ADesc) const; + + /** + * Converts a sample float into + * 24-bit PCM data. + * + */ + static inline i32_t convertSampleFloatToInt24(float sample) + { + if (sample >= 0.0) + { + return (static_cast<i32_t>(sample * INT24_MAX) << 8); + } + else + { + return (static_cast<i32_t>(-sample * INT24_MIN) << 8); + } + } + }; + + } // namespace PCM +} // namespace ASDCP + +#endif // _FSKSyncChannel_GENERATOR_H_ + +// +// end FSKSyncChannel_Generator.h +// |