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annotate libgsmefr/tls_flags.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents 38326102fc43
children
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38326102fc43 libgsmefr: beginning to integrate code from ETSI
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1 /*
38326102fc43 libgsmefr: beginning to integrate code from ETSI
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2 * Unfortunately the code we got from ETSI makes heavy use of two global
38326102fc43 libgsmefr: beginning to integrate code from ETSI
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3 * Boolean flags named Carry and Overflow that function like equally named
38326102fc43 libgsmefr: beginning to integrate code from ETSI
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4 * processor state flags on many CPU architectures. They are not part
38326102fc43 libgsmefr: beginning to integrate code from ETSI
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5 * of persistent codec session state for either the encoder or the decoder,
38326102fc43 libgsmefr: beginning to integrate code from ETSI
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6 * instead they are "short-term" globals much like UNIX errno.
38326102fc43 libgsmefr: beginning to integrate code from ETSI
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7 *
38326102fc43 libgsmefr: beginning to integrate code from ETSI
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8 * Given this unfortunate reality plus the natural desire to make our
38326102fc43 libgsmefr: beginning to integrate code from ETSI
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9 * EFR library thread-safe (a transcoding MGW handling a large volume of
38326102fc43 libgsmefr: beginning to integrate code from ETSI
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10 * simultaneous calls is exactly the kind of application that would benefit
38326102fc43 libgsmefr: beginning to integrate code from ETSI
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11 * from utilitizing all CPU cores), our current workaround is to use
38326102fc43 libgsmefr: beginning to integrate code from ETSI
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12 * thread-local storage.
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13 */
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15 #include <stdint.h>
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16 #include "typedef.h"
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18 __thread Flag EFR__Carry, EFR__Overflow;