1 #ifndef _MIXER_OUTPUT_H 2 #define _MIXER_OUTPUT_H 3 4 #include <Buffer.h> 5 #include "MixerDebug.h" 6 #include "ByteSwap.h" 7 #include "MixerCore.h" 8 9 /* The data storage for channel sources is optimized 10 * for fast data retrieval by the MixerCore, which 11 * will call GetOutputChannelSourceInfoAt() and 12 * iterate through the first source_count array entries 13 * for source_gain[] and source_type[] arrays, they are 14 * index by 0 to GetOutputChannelSourceCount() - 1. 15 * To allow gain change for not active sources, 16 * we use the source_gain_cache[] array that is indexed 17 * by source_type. 18 */ 19 20 class MixerOutput 21 { 22 public: 23 MixerOutput(MixerCore *core, const media_output &output); 24 ~MixerOutput(); 25 26 media_output & MediaOutput(); 27 28 void ChangeFormat(const media_multi_audio_format &format); 29 30 // The physical output channels 31 int GetOutputChannelCount(); 32 int GetOutputChannelType(int channel); 33 void SetOutputChannelGain(int channel, float gain); 34 float GetOutputChannelGain(int channel); 35 36 // The sources for each channel 37 void AddOutputChannelSource(int channel, int source_type); 38 void RemoveOutputChannelSource(int channel, int source_type); 39 void SetOutputChannelSourceGain(int channel, int source_type, float source_gain); 40 float GetOutputChannelSourceGain(int channel, int source_type); 41 bool HasOutputChannelSource(int channel, int source_type); 42 43 // The output can be muted 44 void SetMuted(bool yesno); 45 bool IsMuted(); 46 47 // Only for use by MixerCore: 48 49 // For iteration of a channel's sources 50 int GetOutputChannelSourceCount(int channel); 51 void GetOutputChannelSourceInfoAt(int channel, int source_index, int *source_type, float *source_gain); 52 53 // To swap byteorder in a buffer is that is needed 54 void AdjustByteOrder(BBuffer *buffer); 55 56 private: 57 void UpdateByteOrderSwap(); 58 void UpdateOutputChannels(); 59 void AssignDefaultSources(); 60 61 private: 62 63 /* An entry in the source array is not the same as the 64 * channel type, but the count should be the same 65 */ 66 enum { 67 MAX_SOURCE_ENTRIES = MAX_CHANNEL_TYPES 68 }; 69 70 struct output_chan_info { 71 int channel_type; 72 float channel_gain; 73 int source_count; 74 float source_gain[MAX_SOURCE_ENTRIES]; 75 int source_type[MAX_SOURCE_ENTRIES]; 76 float source_gain_cache[MAX_CHANNEL_TYPES]; 77 }; 78 79 MixerCore *fCore; 80 media_output fOutput; 81 82 int fOutputChannelCount; 83 output_chan_info *fOutputChannelInfo; //array 84 ByteSwap *fOutputByteSwap; 85 86 bool fMuted; 87 }; 88 89 inline int MixerOutput::GetOutputChannelCount() 90 { 91 return fOutputChannelCount; 92 } 93 94 inline float MixerOutput::GetOutputChannelGain(int channel) 95 { 96 if (channel < 0 || channel >= fOutputChannelCount) 97 return 1.0; 98 return fOutputChannelInfo[channel].channel_gain; 99 } 100 101 inline int MixerOutput::GetOutputChannelSourceCount(int channel) 102 { 103 ASSERT(channel >= 0 && channel < fOutputChannelCount); 104 return fOutputChannelInfo[channel].source_count; 105 } 106 107 inline void MixerOutput::GetOutputChannelSourceInfoAt(int channel, int source_index, int *source_type, float *source_gain) 108 { 109 ASSERT(channel >= 0 && channel < fOutputChannelCount); 110 ASSERT(source_index >= 0 && source_index < fOutputChannelInfo[channel].source_count); 111 *source_type = fOutputChannelInfo[channel].source_type[source_index]; 112 *source_gain = fOutputChannelInfo[channel].source_gain[source_index]; 113 } 114 115 inline void MixerOutput::AdjustByteOrder(BBuffer *buffer) 116 { 117 if (fOutputByteSwap) 118 fOutputByteSwap->Swap(buffer->Data(), buffer->SizeUsed()); 119 } 120 121 inline bool MixerOutput::IsMuted() 122 { 123 return fMuted; 124 } 125 126 #endif 127