From patchwork Fri Jun 12 17:30:36 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eduardo Valentin X-Patchwork-Id: 29933 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n5CHbDba026398 for ; Fri, 12 Jun 2009 17:37:17 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756988AbZFLRgZ (ORCPT ); Fri, 12 Jun 2009 13:36:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762985AbZFLRgZ (ORCPT ); Fri, 12 Jun 2009 13:36:25 -0400 Received: from smtp.nokia.com ([192.100.122.230]:56974 "EHLO mgw-mx03.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756988AbZFLRgW (ORCPT ); Fri, 12 Jun 2009 13:36:22 -0400 Received: from vaebh106.NOE.Nokia.com (vaebh106.europe.nokia.com [10.160.244.32]) by mgw-mx03.nokia.com (Switch-3.2.6/Switch-3.2.6) with ESMTP id n5CHZeeW017426; Fri, 12 Jun 2009 20:35:44 +0300 Received: from vaebh104.NOE.Nokia.com ([10.160.244.30]) by vaebh106.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.3959); Fri, 12 Jun 2009 20:35:44 +0300 Received: from vaebe101.NOE.Nokia.com ([10.160.244.11]) by vaebh104.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.3959); Fri, 12 Jun 2009 20:35:43 +0300 Received: from localhost.localdomain ([172.21.41.99]) by vaebe101.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.3959); Fri, 12 Jun 2009 20:35:42 +0300 From: Eduardo Valentin To: "ext Hans Verkuil" , "ext Mauro Carvalho Chehab" Cc: "Nurkkala Eero.An (EXT-Offcode/Oulu)" , "Aaltonen Matti.J (Nokia-D/Tampere)" , "ext Douglas Schilling Landgraf" , Linux-Media , Eduardo Valentin Subject: [PATCHv7 5/9] v4l2-spec: Add documentation description for FM TX extended control class Date: Fri, 12 Jun 2009 20:30:36 +0300 Message-Id: <1244827840-886-6-git-send-email-eduardo.valentin@nokia.com> X-Mailer: git-send-email 1.6.2.GIT In-Reply-To: <1244827840-886-5-git-send-email-eduardo.valentin@nokia.com> References: <1244827840-886-1-git-send-email-eduardo.valentin@nokia.com> <1244827840-886-2-git-send-email-eduardo.valentin@nokia.com> <1244827840-886-3-git-send-email-eduardo.valentin@nokia.com> <1244827840-886-4-git-send-email-eduardo.valentin@nokia.com> <1244827840-886-5-git-send-email-eduardo.valentin@nokia.com> X-OriginalArrivalTime: 12 Jun 2009 17:35:42.0867 (UTC) FILETIME=[35DD3630:01C9EB84] X-Nokia-AV: Clean Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This single patch adds documentation description for FM Modulator (FM_TX) Extended Control Class and its Control IDs. The text was added under "Extended Controls" section. Signed-off-by: Eduardo Valentin --- v4l2-spec/Makefile | 1 + v4l2-spec/biblio.sgml | 10 +++ v4l2-spec/controls.sgml | 205 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 216 insertions(+), 0 deletions(-) diff --git a/v4l2-spec/Makefile b/v4l2-spec/Makefile index 7a19924..bfe2965 100644 --- a/v4l2-spec/Makefile +++ b/v4l2-spec/Makefile @@ -242,6 +242,7 @@ ENUMS = \ v4l2_power_line_frequency \ v4l2_priority \ v4l2_tuner_type \ + v4l2_fm_tx_preemphasis \ STRUCTS = \ v4l2_audio \ diff --git a/v4l2-spec/biblio.sgml b/v4l2-spec/biblio.sgml index b013ece..0921849 100644 --- a/v4l2-spec/biblio.sgml +++ b/v4l2-spec/biblio.sgml @@ -11,6 +11,16 @@ url="http://www.eia.org">http://www.eia.org) Service" + + EN 50067 + + CENELEC European Committee for Electrotechnical Standardization +(http://www.cenelec.eu) + + EN 50067 "Specification of the radio data system (RDS) for +VHF/FM sound broadcasting in the frequency range from 87,5 to 108,0 MHz" + + EN 300 294 diff --git a/v4l2-spec/controls.sgml b/v4l2-spec/controls.sgml index 477a970..0bb6f00 100644 --- a/v4l2-spec/controls.sgml +++ b/v4l2-spec/controls.sgml @@ -458,6 +458,12 @@ video is actually encoded into that format. Unfortunately, the original control API lacked some features needed for these new uses and so it was extended into the (not terribly originally named) extended control API. + + Even though the MPEG encoding API was the first effort +to use the Extended Control API, nowadays there are also other classes +of Extended Controls, such as Camera Controls and FM Transmitter Controls. +The Extended Controls API as well as all Extended Controls classes are +described in the following text.
@@ -1816,6 +1822,205 @@ control must support read access and may support write access.
+ +
+ FM Transmitter Control Reference + + The FM Transmitter (FM_TX) class includes controls for common features of +FM transmissions capable devices. Currently this class include parameters for audio +compression, pilot tone generation, audio deviation limiter, RDS transmission and +tuning power features. + + + FM_TX Control IDs + + + + + + + + + + + ID + Type + Description + + + + + + V4L2_CID_FM_TX_CLASS  + class + The FM_TX class +descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a +description of this control class. + + + V4L2_CID_RDS_ENABLED  + boolean + + Enables or disables the RDS transmission feature. + + + V4L2_CID_RDS_PI  + integer + + Sets the RDS Programme Identification field +for transmission. + + + V4L2_CID_RDS_PTY  + integer + + Sets the RDS Programme Type field for transmission. +This coding of up to 31 pre-defined programme types. + + + V4L2_CID_RDS_PS_NAME  + string + + Sets the Programme Service name (PS_NAME) for transmission. +It is intended for static display on a receiver. It is the primary aid to listeners in programme service +identification and selection. The use of PS to transmit text other than a single eight character name is not permitted. + + + V4L2_CID_RDS_RADIO_TEXT  + string + + Sets the Radio Text info for transmission. It is a textual description of +what is being broadcasted. If broadcaster wishes to transmit longer PS names, programme-related information or any other +text, then RadioText should be used. + + + V4L2_CID_AUDIO_LIMITER_ENABLED  + boolean + + Enables or disables the audio deviation limiter feature. +The limiter is useful when trying to maximize the audio volume, minimize receiver-generated +distortion and prevent overmodulation. + + + + V4L2_CID_AUDIO_LIMITER_RELEASE_TIME  + integer + + Sets the audio deviation limiter feature release time. +The unit, step and range are driver-specific. + + + V4L2_CID_AUDIO_LIMITER_DEVIATION  + integer + + Configures audio frequency deviation level in Hz. +The range and step are driver-specific. + + + V4L2_CID_AUDIO_COMPRESSION_ENABLED  + boolean + + Enables or disables the audio compression feature. +This feature amplifies signals below the threshold by a fixed gain and compresses audio +signals above the threshold by the ratio of Threshold/(Gain + Threshold). + + + V4L2_CID_AUDIO_COMPRESSION_GAIN  + integer + + Sets the gain for audio compression feature. It is +a dB value. The range and step are driver-specific. + + + V4L2_CID_AUDIO_COMPRESSION_THRESHOLD  + integer + + Sets the threshold level for audio compression freature. +It is a dB value. The range and step are driver-specific. + + + V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME  + integer + + Sets the attack time for audio compression feature. +It is a useconds value. The range and step are driver-specific. + + + V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME  + integer + + Sets the release time for audio compression feature. +It is a useconds value. The range and step are driver-specific. + + + V4L2_CID_PILOT_TONE_ENABLED  + boolean + + Enables or disables the pilot tone generation feature. + + + V4L2_CID_PILOT_TONE_DEVIATION  + integer + + Configures pilot tone frequency deviation level. Unit is +in Hz. The range and step are driver-specific. + + + V4L2_CID_PILOT_TONE_FREQUENCY  + integer + + Configures pilot tone frequency value. Unit is +in Hz. The range and step are driver-specific. + + + V4L2_CID_PREEMPHASIS  + integer + + Configures the pre-emphasis value for broadcasting. +A pre-emphasis filter is applied to the broadcast to accentuate the high audio frequencies. +Depending on the region, a time constant of either 50 or 75 useconds is used. The enum v4l2_fm_tx_preemphasis +defines possible values for pre-emphasis. Here they are: + + + + + V4L2_FM_TX_PREEMPHASIS_DISABLED  + No pre-emphasis is applied. + + + V4L2_FM_TX_PREEMPHASIS_50_uS  + A pre-emphasis of 50 uS is used. + + + V4L2_FM_TX_PREEMPHASIS_75_uS  + A pre-emphasis of 75 uS is used. + + + + + + + V4L2_CID_TUNE_POWER_LEVEL  + integer + + Sets the output power level for signal transmission. +Unit is in dBuV. Range and step are driver-specific. + + + V4L2_CID_TUNE_ANTENNA_CAPACITOR  + integer + + This selects the value of antenna tuning capacitor +manually or automatically if set to zero. Unit, range and step are driver-specific. + + + + +
+ +For more details about RDS specification, refer to + document, from CENELEC. +