lib_src: Sample rate conversion

• Introduction
  • lib_src components
  • Using lib_src
• HiFi quality multi-rate SRC
  • Initialisation
  • Processing
  • Buffer formats
  • Performance and resource utilisation
    • Audio performance
    • SSRC resource utilisation
    • ASRC performance
    • ASRC latency / group delay
  • Implementation detail
    • SSRC structure
    • ASRC structure
    • SRC filter list
  • File structure and overview
  • SSRC API
    • ssrc_init()
    • ssrc_process()
  • ASRC API
    • asrc_init()
    • asrc_process()
• HiFi quality fixed factor of 3 SRC
  • Shared API items
    • src_ff3_return_code_t
  • HiFi quality DS3 API
    • src_ds3_ctrl_t
    • src_ds3_init()
    • src_ds3_sync()
    • src_ds3_proc()
  • HiFi quality OS3 API
    • src_os3_ctrl_t
    • src_os3_init()
    • src_os3_sync()
    • src_os3_input()
    • src_os3_proc()
• Voice quality fixed factor of 3 SRC
  • Voice quality DS3 API
    • src_ds3_voice_add_sample()
    • src_ds3_voice_add_final_sample()
  • Voice quality US3 API
    • src_us3_voice_input_sample()
    • src_us3_voice_get_next_sample()
• Voice quality fixed factor of 3 and 3/2 SRC optimised for XS3
  • Fixed factor of 3 VPU implementation
  • Voice quality DS3 VPU API
    • src_ff3_96t_ds()
  • Voice quality US3 VPU API
    • src_ff3_96t_us()
  • Fixed factor of 3/2 VPU implementation
  • Voice quality DS3/2 API
    • src_rat_2_3_96t_ds()
  • Voice quality US3/2 API
    • src_rat_3_2_96t_us()
• Asynchronous FIFO
  • Using the asynchronous FIFO
  • Design parameters
    • Practical FIFO sizing for ASRC usage
  • Controller settings
  • API
    • asynchronous_fifo_get_return_t_
    • asynchronous_fifo_t
    • asynchronous_fifo_get_return_t
    • asynchronous_fifo_init()
    • asynchronous_fifo_init_PID_fs_codes()
    • asynchronous_fifo_init_PID_raw()
    • asynchronous_fifo_reset_producer()
    • asynchronous_fifo_reset_consumer()
    • asynchronous_fifo_exit()
    • asynchronous_fifo_producer_put()
    • asynchronous_fifo_consumer_get()
    • ASYNCHRONOUS_FIFO_INT64_ELEMENTS
    • asynchronous_fifo_t_
    • asrc_timestamp_interpolation()
  • Implementation detail
    • Measurements for the PID
    • Implementation of asynchronicity
    • Communication and reset protocol summary
• ASRC Task
  • Operation
  • Latency characterisation
  • API & usage
    • asrc_task_produce_isr_cb_t
    • asrc_task()
    • pull_samples()
    • reset_asrc_fifo_consumer()
    • init_asrc_io_callback()
    • send_asrc_input_samples_default()
    • ASRC_TASK_ISR_CALLBACK_ATTR
    • MAX_ASRC_CHANNELS_TOTAL
    • MAX_ASRC_THREADS
    • SRC_N_IN_SAMPLES
    • SRC_N_OUT_IN_RATIO_MAX
    • SRC_DITHER_SETTING
    • asrc_in_out_t
• Performance characterisation
  • Pure Tone FFT SRC plots across sample rate combinations
    • Frequency error: 0.999900Hz
    • Frequency error: 1.000000Hz
    • Frequency error: 1.000100Hz
  • Summary table