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Implement left and right justifications for 24 to 32 bit PCM encoding

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This commit is contained in:
Reinhard Panhuber 2021-02-18 19:25:08 +01:00
parent 681cfd0bf2
commit c098da9803
2 changed files with 20 additions and 2 deletions
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10
src/class/audio/audio_device.c
View File

@ -366,11 +366,15 @@ static bool audiod_decode_type_I_pcm(uint8_t rhport, audiod_interface_t* audio)
// If this aborts then the target buffer is full
TU_VERIFY(tu_fifo_read_n_into_other_fifo(&audio->ep_out_ff, &audio->rx_ff[cntChannel], 0, CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_RX));
#else
// TODO: Implement a left and right justified 24 to 32 and vice versa copy process from FIFO to FIFO
uint32_t sample = 0;
// Get sample from buffer
TU_VERIFY(tu_fifo_read_n(&audio->ep_out_ff, &sample, CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_RX));
#if CFG_TUD_AUDIO_JUSTIFICATION_RX == CFG_TUD_AUDIO_LEFT_JUSTIFIED
sample = sample << 8;
#endif
TU_VERIFY(tu_fifo_write_n(&audio->rx_ff[cntChannel], &sample, CFG_TUD_AUDIO_RX_ITEMSIZE));
#endif
}
@ -584,12 +588,14 @@ static bool audiod_encode_type_I_pcm(uint8_t rhport, audiod_interface_t* audio)
#if CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_TX == CFG_TUD_AUDIO_TX_ITEMSIZE
tu_fifo_read_n_into_other_fifo(&audio->tx_ff[cntChannel], &audio->ep_in_ff, 0, CFG_TUD_AUDIO_TX_ITEMSIZE);
#else
// TODO: Implement a left and right justified 24 to 32 and vice versa copy process from FIFO to FIFO
uint32_t sample = 0;
// Get sample from buffer
tu_fifo_read_n(&audio->tx_ff[cntChannel], &sample, CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_TX);
#if CFG_TUD_AUDIO_JUSTIFICATION_TX == CFG_TUD_AUDIO_LEFT_JUSTIFIED
sample = sample << 8;
#endif
tu_fifo_write_n(&audio->ep_in_ff, &sample, CFG_TUD_AUDIO_TX_ITEMSIZE);
#endif
}

12
src/class/audio/audio_device.h
View File

@ -203,6 +203,18 @@
#endif
// In case PCM encoding/decoding of 24 into 32 bits, the adjustment needs to be defined
#define CFG_TUD_AUDIO_LEFT_JUSTIFIED
#define CFG_TUD_AUDIO_RIGHT_JUSTIFIED
#ifndef CFG_TUD_AUDIO_JUSTIFICATION_RX
#define CFG_TUD_AUDIO_JUSTIFICATION_RX CFG_TUD_AUDIO_LEFT_JUSTIFIED
#endif
#ifndef CFG_TUD_AUDIO_JUSTIFICATION_TX
#define CFG_TUD_AUDIO_JUSTIFICATION_TX CFG_TUD_AUDIO_LEFT_JUSTIFIED
#endif
//static_assert(sizeof(tud_audio_desc_lengths) != CFG_TUD_AUDIO, "Supply audio function descriptor pack length!");
// Supported types of this driver: