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annotate libtwamr/tls_flags.c @ 604:54f0f1b74c25

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libgsmhr1 TFO: require BFI=0 and SID=0 for homing In order for a received frame to be recognized as DHF, we need not only the correct bit pattern, but also BFI=0 and SID=0. The BFI=0 requirement should be obvious, while the SID=0 requirement is needed only for HR codec. With FR and EFR, SID classification comes from the payload bits and no separate check is needed - but in HR we get an out-of-band SID ternary flag. When SID=1, no payload bits are used at all; when SID=2, we use only the first 33 bits of the payload. Therefore, it is proper to conditionalize DHF acceptance on SID=0. We already implemented this logic in the just finished full decoder; now bring TFO code into agreement.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 19:40:35 +0000
parents dfb1f86541b2
children
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38326102fc43 libgsmefr: beginning to integrate code from ETSI
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1 /*
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2 * Unfortunately the code we got from ETSI makes heavy use of two global
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3 * Boolean flags named Carry and Overflow that function like equally named
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4 * processor state flags on many CPU architectures. They are not part
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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
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57b4053559ff libtwamr: beginning of project
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9 * AMR library thread-safe (a transcoding MGW handling a large volume of
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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
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12 * thread-local storage.
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13 */
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15 #include "typedef.h"
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dfb1f86541b2 libtwamr/tls_flags.c: use namespace.h for the right prefix
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16 #include "namespace.h"
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dfb1f86541b2 libtwamr/tls_flags.c: use namespace.h for the right prefix
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18 __thread Flag Carry, Overflow;