From patchwork Wed Jul 11 14:17:10 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arun Kumar K X-Patchwork-Id: 1182811 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id B26843FC8E for ; Wed, 11 Jul 2012 14:03:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932733Ab2GKODP (ORCPT ); Wed, 11 Jul 2012 10:03:15 -0400 Received: from mailout3.samsung.com ([203.254.224.33]:22699 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932674Ab2GKODN (ORCPT ); Wed, 11 Jul 2012 10:03:13 -0400 Received: from epcpsbgm1.samsung.com (mailout3.samsung.com [203.254.224.33]) by mailout3.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0M70005DU1OU3ZJ0@mailout3.samsung.com> for linux-media@vger.kernel.org; Wed, 11 Jul 2012 23:03:12 +0900 (KST) X-AuditID: cbfee61a-b7f616d000004b7e-18-4ffd879feb40 Received: from epmmp2 ( [203.254.227.17]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id C9.6F.19326.F978DFF4; Wed, 11 Jul 2012 23:03:11 +0900 (KST) Received: from localhost.localdomain ([107.108.73.106]) by mmp2.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0M7000LFC1OYVM10@mmp2.samsung.com> for linux-media@vger.kernel.org; Wed, 11 Jul 2012 23:03:11 +0900 (KST) From: Arun Kumar K To: linux-media@vger.kernel.org Cc: jtp.park@samsung.com, janghyuck.kim@samsung.com, jaeryul.oh@samsung.com, ch.naveen@samsung.com, arun.kk@samsung.com, m.szyprowski@samsung.com, k.debski@samsung.com, s.nawrocki@samsung.com, hverkuil@xs4all.nl, mchehab@infradead.org, kmpark@infradead.org, joshi@samsung.com Subject: [PATCH v1 2/2] [media] v4l: Add control definitions for new H264 encoder features Date: Wed, 11 Jul 2012 19:47:10 +0530 Message-id: <1342016230-14278-3-git-send-email-arun.kk@samsung.com> X-Mailer: git-send-email 1.7.0.4 In-reply-to: <1342016230-14278-1-git-send-email-arun.kk@samsung.com> References: <1342016230-14278-1-git-send-email-arun.kk@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrMJMWRmVeSWpSXmKPExsVy+t9jQd357X/9Dd51Wln0bNjK6sDo8XmT XABjFJdNSmpOZllqkb5dAlfGu73rGQtuzWOs6Pv5lK2Bsa2ZsYuRk0NCwERi2u1vULaYxIV7 69lAbCGB6YwS589qdTFyAdnLmSSmzFvOCpJgE9CQuHfiMZgtIiAv8aT3BhtIEbPATCaJJa1f wbqFBWIknr84zwxiswioSnx43sQOYvMKOEt8ef4RapuCROuyQ2BxTgEXia/7brN0MXIAbXOW WLRUdgIj7wJGhlWMoqkFyQXFSem5hnrFibnFpXnpesn5uZsYwV5/JrWDcWWDxSFGAQ5GJR7e E4V//YVYE8uKK3MPMUpwMCuJ8EqBhHhTEiurUovy44tKc1KLDzFKc7AoifMae3/1FxJITyxJ zU5NLUgtgskycXBKNTAarld8IvT9u9bO1RqmC14t5rx1Lc+al1U3dHXSVdlTMVYPPv2zcheU +CUR71/357tk9OuAs3IhU0v1I7f+aPDSiGQtLTnyLzqVz2Pxz4Yfpn9133W+/P/sYuzaRe2a C9l4Vv/NVvogyv7txaYjh33mvVn7NqrM3Xp6/r9v88ICb/Uusf0h1mWoxFKckWioxVxUnAgA GNWLr/YBAAA= X-TM-AS-MML: No Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Jeongtae Park New controls are added for supporting H264 encoding features like - MVC frame packing - Flexible macroblock ordering - Arbitrary slice ordering - Hierarchial coding Signed-off-by: Jeongtae Park Signed-off-by: Naveen Krishna Chatradhi Signed-off-by: Arun Kumar K Cc: Marek Szyprowski Cc: Kamil Debski --- Documentation/DocBook/media/v4l/controls.xml | 268 +++++++++++++++++++++++++- drivers/media/video/v4l2-ctrls.c | 42 ++++ include/linux/videodev2.h | 41 ++++ 3 files changed, 350 insertions(+), 1 deletions(-) diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml index 676bc46..a25582a 100644 --- a/Documentation/DocBook/media/v4l/controls.xml +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -1581,7 +1581,6 @@ frame counter of the frame that is currently displayed (decoded). This value is the decoder is started. - V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE  @@ -2265,6 +2264,14 @@ Applicable to the MPEG1, MPEG2, MPEG4 encoders. + + V4L2_CID_MPEG_VIDEO_VBV_DELAY  + integer + Sets the initial delay in milliseconds for +VBV buffer control. + + + V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE  integer @@ -2329,6 +2336,265 @@ Applicable to the MPEG4 decoder. vop_time_increment value for MPEG4. Applicable to the MPEG4 encoder. + + + V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING  + boolean + + Enable generation of frame packing supplemental enhancement information in the encoded bitstream. +The frame packing SEI message contains the arrangement of L and R planes for 3D viewing. Applicable to the H264 encoder. + + + + + V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0  + boolean + + Sets current frame as frame0 in frame packing SEI. +Applicable to the H264 encoder. + + + + + V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE  + enum v4l2_mpeg_video_h264_sei_fp_arrangement_type + + Frame packing arrangement type for H264 SEI. +Applicable to the H264 encoder. +Possible values are: + + + + + + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_CHEKERBOARD  + Pixels are alternatively from L and R. + + + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_COLUMN  + L and R are interlaced by column. + + + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_ROW  + L and R are interlaced by row. + + + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_SIDE_BY_SIDE  + L is on the left, R on the right. + + + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TOP_BOTTOM  + L is on top, R on bottom. + + + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TEMPORAL  + One view per frame. + + + + + + + + V4L2_CID_MPEG_VIDEO_H264_FMO  + boolean + + Enables flexible macroblock ordering in the encoded bitstream. It is a technique +used for restructuring the ordering of macroblocks in pictures. Applicable to the H264 encoder. + + + + + V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE  + enum v4l2_mpeg_video_h264_fmo_map_type + + When using FMO, the map type divides the image in different scan patterns of macroblocks. +Applicable to the H264 encoder. +Possible values are: + + + + + + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_INTERLEAVED_SLICES  + Slices are interleaved one after other with macroblocks in run length order. + + + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_SCATTERED_SLICES  + Scatters the macroblocks based on a mathematical function known to both encoder and decoder. + + + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_FOREGROUND_WITH_LEFT_OVER  + Macroblocks arranged in rectangular areas or regions of interest. + + + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_BOX_OUT  + Slice groups grow in a cyclic way from centre to outwards. + + + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_RASTER_SCAN  + Slice groups grow in raster scan pattern from left to right. + + + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_WIPE_SCAN  + Slice groups grow in wipe scan pattern from top to bottom. + + + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_EXPLICIT  + User defined map type. + + + + + + + + V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP  + integer + + Number of slice groups in FMO. +Applicable to the H264 encoder. + + + + + V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION  + enum v4l2_mpeg_video_h264_fmo_change_dir + + Specifies a direction of the slice group change for raster and wipe maps. +Applicable to the H264 encoder. +Possible values are: + + + + + + V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_RIGHT  + Raster scan or wipe right. + + + V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_LEFT  + Reverse raster scan or wipe left. + + + + + + + + V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE  + integer + + Specifies the size of the first slice group for raster and wipe map. +Applicable to the H264 encoder. + + + + + V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH  + integer + + Specifies the number of consecutive macroblocks for the interleaved map. +Applicable to the H264 encoder. + + + + + V4L2_CID_MPEG_VIDEO_H264_ASO  + boolean + + Enables arbitrary slice ordering in encoded bitstream. +Applicable to the H264 encoder. + + + + + V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER  + integer + Specifies the slice order in ASO. Applicable to the H264 encoder. +The supplied 32-bit integer is interpreted as follows (bit +0 = least significant bit): + + + + + + Bit 0:15 + Slice ID + + + Bit 16:32 + Slice position or order + + + + + + + + V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING  + boolean + + Enables H264 hierarchial coding. +Applicable to the H264 encoder. + + + + + V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE  + enum v4l2_mpeg_video_h264_hierarchical_coding_type + + Specifies the hierarchial coding type. +Applicable to the H264 encoder. +Possible values are: + + + + + + V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_B  + Hierarchial B coding. + + + V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_P  + Hierarchial P coding. + + + + + + + + V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER  + integer + + Specifies the number of hierarchial coding layers. +Applicable to the H264 encoder. + + + + + V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP  + integer + Specifies a user defined QP for each layer. Applicable to the H264 encoder. +The supplied 32-bit integer is interpreted as follows (bit +0 = least significant bit): + + + + + + Bit 0:15 + QP value + + + Bit 16:32 + Layer number + + + + + diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c index 9abd9ab..f81c790 100644 --- a/drivers/media/video/v4l2-ctrls.c +++ b/drivers/media/video/v4l2-ctrls.c @@ -384,6 +384,25 @@ const char * const *v4l2_ctrl_get_menu(u32 id) "Extended SAR", NULL, }; + static const char * const h264_fp_arrangement_type[] = { + "Checkerboard", + "Column", + "Row", + "Side by side", + "Top Bottom", + "Temporal", + NULL, + }; + static const char * const h264_fmo_map_type[] = { + "Interleaved Slices", + "Scattered Slices", + "Foreground With Leftover", + "Box Out", + "Raster Scan", + "Wipe Scan", + "Explicit", + NULL, + }; static const char * const mpeg_mpeg4_level[] = { "0", "0b", @@ -496,6 +515,10 @@ const char * const *v4l2_ctrl_get_menu(u32 id) return h264_profile; case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return vui_sar_idc; + case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: + return h264_fp_arrangement_type; + case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: + return h264_fmo_map_type; case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: return mpeg_mpeg4_level; case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: @@ -626,6 +649,22 @@ const char *v4l2_ctrl_get_name(u32 id) case V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH: return "Horizontal Size of SAR"; case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE: return "Aspect Ratio VUI Enable"; case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: return "VUI Aspect Ratio IDC"; + case V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING: return "H264 Enable Frame Packing SEI"; + case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0: return "H264 Set Current Frame as Frame0"; + case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: return "H264 Frame Packing Arrangement Type"; + case V4L2_CID_MPEG_VIDEO_H264_FMO: return "H264 Flexible Macroblock Ordering"; + case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: return "H264 Map Type for FMO"; + case V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP: return "H264 FMO Number of Slice Groups"; + case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION: return "H264 FMO Direction of the Slice Group Change"; + case V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE: return "H264 FMO Size of the First Slice Group"; + case V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH: return "H264 FMO Number of Consecutive MBs"; + case V4L2_CID_MPEG_VIDEO_H264_ASO: return "H264 Arbitrary Slice Ordering"; + case V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER: return "H264 ASO Slice Order"; + case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING: return "Enable H264 Hierarchial Coding"; + case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE: return "H264 Hierarchial Coding Type"; + case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER:return "H264 Number of Hierarchial Coding Layers"; + case V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP: + return "H264 Set QP Value for Hierarchial Coding Layers"; case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value"; case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value"; case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value"; @@ -640,6 +679,7 @@ const char *v4l2_ctrl_get_name(u32 id) case V4L2_CID_MPEG_VIDEO_VBV_SIZE: return "VBV Buffer Size"; case V4L2_CID_MPEG_VIDEO_DEC_PTS: return "Video Decoder PTS"; case V4L2_CID_MPEG_VIDEO_DEC_FRAME: return "Video Decoder Frame Count"; + case V4L2_CID_MPEG_VIDEO_VBV_DELAY: return "Initial Delay for VBV Buffer Control"; /* CAMERA controls */ /* Keep the order of the 'case's the same as in videodev2.h! */ @@ -825,6 +865,8 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type, case V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE: case V4L2_CID_MPEG_VIDEO_H264_PROFILE: case V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC: + case V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE: + case V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE: case V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL: case V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE: case V4L2_CID_JPEG_CHROMA_SUBSAMPLING: diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h index e23e6a7..4db4e7c 100644 --- a/include/linux/videodev2.h +++ b/include/linux/videodev2.h @@ -1614,6 +1614,7 @@ enum v4l2_mpeg_video_multi_slice_mode { #define V4L2_CID_MPEG_VIDEO_VBV_SIZE (V4L2_CID_MPEG_BASE+222) #define V4L2_CID_MPEG_VIDEO_DEC_PTS (V4L2_CID_MPEG_BASE+223) #define V4L2_CID_MPEG_VIDEO_DEC_FRAME (V4L2_CID_MPEG_BASE+224) +#define V4L2_CID_MPEG_VIDEO_VBV_DELAY (V4L2_CID_MPEG_BASE+225) #define V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP (V4L2_CID_MPEG_BASE+300) #define V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP (V4L2_CID_MPEG_BASE+301) @@ -1704,6 +1705,46 @@ enum v4l2_mpeg_video_h264_vui_sar_idc { V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_2x1 = 16, V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_EXTENDED = 17, }; +#define V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING (V4L2_CID_MPEG_BASE+368) +#define V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0 (V4L2_CID_MPEG_BASE+369) +#define V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE (V4L2_CID_MPEG_BASE+370) +enum v4l2_mpeg_video_h264_sei_fp_arrangement_type { + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_CHEKERBOARD = 0, + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_COLUMN = 1, + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_ROW = 2, + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_SIDE_BY_SIDE = 3, + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TOP_BOTTOM = 4, + V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TEMPORAL = 5, +}; +#define V4L2_CID_MPEG_VIDEO_H264_FMO (V4L2_CID_MPEG_BASE+371) +#define V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE (V4L2_CID_MPEG_BASE+372) +enum v4l2_mpeg_video_h264_fmo_map_type { + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_INTERLEAVED_SLICES = 0, + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_SCATTERED_SLICES = 1, + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_FOREGROUND_WITH_LEFT_OVER = 2, + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_BOX_OUT = 3, + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_RASTER_SCAN = 4, + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_WIPE_SCAN = 5, + V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_EXPLICIT = 6, +}; +#define V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP (V4L2_CID_MPEG_BASE+373) +#define V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION (V4L2_CID_MPEG_BASE+374) +enum v4l2_mpeg_video_h264_fmo_change_dir { + V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_RIGHT = 0, + V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_LEFT = 1, +}; +#define V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE (V4L2_CID_MPEG_BASE+375) +#define V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH (V4L2_CID_MPEG_BASE+376) +#define V4L2_CID_MPEG_VIDEO_H264_ASO (V4L2_CID_MPEG_BASE+377) +#define V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER (V4L2_CID_MPEG_BASE+378) +#define V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING (V4L2_CID_MPEG_BASE+379) +#define V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE (V4L2_CID_MPEG_BASE+380) +enum v4l2_mpeg_video_h264_hierarchical_coding_type { + V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_B = 0, + V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_P = 1, +}; +#define V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER (V4L2_CID_MPEG_BASE+381) +#define V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP (V4L2_CID_MPEG_BASE+382) #define V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP (V4L2_CID_MPEG_BASE+400) #define V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP (V4L2_CID_MPEG_BASE+401) #define V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP (V4L2_CID_MPEG_BASE+402)