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[46.205.203.47]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5d42a754cb0sm2948476a12.88.2024.12.12.00.44.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Dec 2024 00:44:34 -0800 (PST) From: Arkadiusz Bokowy To: linux-bluetooth@vger.kernel.org Cc: Arkadiusz Bokowy Subject: [PATCH 2/2] sbc: Add sbc_get_delay API to retrieve codec delay Date: Thu, 12 Dec 2024 09:44:19 +0100 Message-Id: <20241212084419.1326427-2-arkadiusz.bokowy@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241212084419.1326427-1-arkadiusz.bokowy@gmail.com> References: <20241212084419.1326427-1-arkadiusz.bokowy@gmail.com> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Most audio codecs introduce intrinsic codec delay. SBC codec introduces encode/decode delay which is not constant but depends on the number of subbunds used. Providing API for that will simplify library usage in case when precise delay calculation is required. --- sbc/sbc.c | 20 ++++++++++++++++++++ sbc/sbc.h | 3 +++ 2 files changed, 23 insertions(+) diff --git a/sbc/sbc.c b/sbc/sbc.c index 428c8ee..869f367 100644 --- a/sbc/sbc.c +++ b/sbc/sbc.c @@ -1470,6 +1470,26 @@ SBC_EXPORT size_t sbc_get_codesize(const sbc_t *sbc) return subbands * blocks * channels * 2; } +SBC_EXPORT unsigned sbc_get_delay(const sbc_t *sbc) +{ + uint16_t subbands; + struct sbc_priv *priv; + + priv = sbc->priv; + if (!priv->init) { + subbands = sbc->subbands ? 8 : 4; + } else { + subbands = priv->frame.subbands; + } + + /* + * The delay is caused by the processing function which analyzes + * old samples to encode the current frame. The amount of that + * samples depends on the number of subbands. + */ + return subbands * 9 + 1; +} + SBC_EXPORT const char *sbc_get_implementation_info(const sbc_t *sbc) { struct sbc_priv *priv; diff --git a/sbc/sbc.h b/sbc/sbc.h index b7323e8..829b161 100644 --- a/sbc/sbc.h +++ b/sbc/sbc.h @@ -94,6 +94,9 @@ unsigned sbc_get_frame_duration(const sbc_t *sbc); /* Returns the uncompressed block size in bytes */ size_t sbc_get_codesize(const sbc_t *sbc); +/* Returns the delay introduced by the codec in frames */ +unsigned sbc_get_delay(const sbc_t *sbc); + const char *sbc_get_implementation_info(const sbc_t *sbc); void sbc_finish(sbc_t *sbc);