From patchwork Mon Sep 21 13:03:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dikshita Agarwal X-Patchwork-Id: 11789727 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0940E6CB for ; Mon, 21 Sep 2020 13:04:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EA34221BE5 for ; Mon, 21 Sep 2020 13:04:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727040AbgIUNEa (ORCPT ); Mon, 21 Sep 2020 09:04:30 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:56138 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726341AbgIUNE2 (ORCPT ); Mon, 21 Sep 2020 09:04:28 -0400 Received: from ironmsg08-lv.qualcomm.com ([10.47.202.152]) by alexa-out.qualcomm.com with ESMTP; 21 Sep 2020 06:04:27 -0700 Received: from ironmsg01-blr.qualcomm.com ([10.86.208.130]) by ironmsg08-lv.qualcomm.com with ESMTP/TLS/AES256-SHA; 21 Sep 2020 06:04:25 -0700 Received: from dikshita-linux.qualcomm.com ([10.204.65.237]) by ironmsg01-blr.qualcomm.com with ESMTP; 21 Sep 2020 18:34:25 +0530 Received: by dikshita-linux.qualcomm.com (Postfix, from userid 347544) id 0BE3D4DEF; Mon, 21 Sep 2020 18:34:23 +0530 (IST) From: Dikshita Agarwal To: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org Cc: mchehab@kernel.org, hverkuil-cisco@xs4all.nl, ezequiel@collabora.com, stanimir.varbanov@linaro.org, vgarodia@codeaurora.org, majja@codeaurora.org, Dikshita Agarwal Subject: [PATCH v2 1/2] media: v4l2-ctrl: Add frame-specific min/max qp controls for hevc Date: Mon, 21 Sep 2020 18:33:59 +0530 Message-Id: <1600693440-3015-2-git-send-email-dikshita@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1600693440-3015-1-git-send-email-dikshita@codeaurora.org> References: <1600693440-3015-1-git-send-email-dikshita@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org - Adds min/max qp controls for B frame for h264. - Adds min/max qp controls for I/P/B frames for hevc similar to h264. - Update valid range of mim/max qp for hevc to accommodate 10 bit. Signed-off-by: Dikshita Agarwal --- .../userspace-api/media/v4l/ext-ctrls-codec.rst | 54 +++++++++++++++++++++- drivers/media/v4l2-core/v4l2-ctrls.c | 8 ++++ include/uapi/linux/v4l2-controls.h | 9 ++++ 3 files changed, 69 insertions(+), 2 deletions(-) diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst index ce728c75..26f8220 100644 --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst @@ -1182,6 +1182,18 @@ enum v4l2_mpeg_video_h264_entropy_mode - V4L2_CID_MPEG_VIDEO_H264_MAX_QP is also set, the quantization parameter should be chosen to meet both requirements. +``V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MIN_QP (integer)`` + Minimum quantization parameter for the H264 B frame to limit B frame + quality to a range. Valid range: from 0 to 51. If + V4L2_CID_MPEG_VIDEO_H264_MIN_QP is also set, the quantization parameter + should be chosen to meet both requirements. + +``V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MAX_QP (integer)`` + Maximum quantization parameter for the H264 B frame to limit B frame + quality to a range. Valid range: from 0 to 51. If + V4L2_CID_MPEG_VIDEO_H264_MAX_QP is also set, the quantization parameter + should be chosen to meet both requirements. + ``V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP (integer)`` Quantization parameter for an I frame for MPEG4. Valid range: from 1 to 31. @@ -3441,11 +3453,13 @@ HEVC/H.265 Control IDs ``V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP (integer)`` Minimum quantization parameter for HEVC. - Valid range: from 0 to 51. + Valid range: from 0 - 51 for 8 bit and + 0 - 63 for 10 bit. ``V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP (integer)`` Maximum quantization parameter for HEVC. - Valid range: from 0 to 51. + Valid range: from 0 - 51 for 8 bit and + 0 - 63 for 10 bit ``V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP (integer)`` Quantization parameter for an I frame for HEVC. @@ -3462,6 +3476,42 @@ HEVC/H.265 Control IDs Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP, V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP]. +``V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MIN_QP (integer)`` + Minimum quantization parameter for the HEVC I frame to limit I frame + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit. + If V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP is also set, the quantization parameter + should be chosen to meet both requirements. + +``V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MAX_QP (integer)`` + Maximum quantization parameter for the HEVC I frame to limit I frame + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit. + If V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP is also set, the quantization parameter + should be chosen to meet both requirements. + +``V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MIN_QP (integer)`` + Minimum quantization parameter for the HEVC P frame to limit P frame + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit. + If V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP is also set, the quantization parameter + should be chosen to meet both requirements. + +``V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MAX_QP (integer)`` + Maximum quantization parameter for the HEVC P frame to limit P frame + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit. + If V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP is also set, the quantization parameter + should be chosen to meet both requirements. + +``V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MIN_QP (integer)`` + Minimum quantization parameter for the HEVC B frame to limit B frame + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit. + If V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP is also set, the quantization parameter + should be chosen to meet both requirements. + +``V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MAX_QP (integer)`` + Maximum quantization parameter for the HEVC B frame to limit B frame + quality to a range. Valid range: from 0 to 51 for 8 bit, 0 - 63 for 10 bit. + If V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP is also set, the quantization parameter + should be chosen to meet both requirements. + ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP (boolean)`` HIERARCHICAL_QP allows the host to specify the quantization parameter values for each temporal layer through HIERARCHICAL_QP_LAYER. This is diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c index bd7f330..abef73e 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls.c +++ b/drivers/media/v4l2-core/v4l2-ctrls.c @@ -920,6 +920,8 @@ const char *v4l2_ctrl_get_name(u32 id) case V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP: return "H264 I-Frame Maximum QP Value"; case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP: return "H264 P-Frame Minimum QP Value"; case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP: return "H264 P-Frame Maximum QP Value"; + case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MIN_QP: return "H264 B-Frame Minimum QP Value"; + case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MAX_QP: return "H264 B-Frame Maximum QP Value"; case V4L2_CID_MPEG_VIDEO_H264_SPS: return "H264 Sequence Parameter Set"; case V4L2_CID_MPEG_VIDEO_H264_PPS: return "H264 Picture Parameter Set"; case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX: return "H264 Scaling Matrix"; @@ -978,6 +980,12 @@ const char *v4l2_ctrl_get_name(u32 id) case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP: return "HEVC B-Frame QP Value"; case V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP: return "HEVC Minimum QP Value"; case V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP: return "HEVC Maximum QP Value"; + case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MIN_QP: return "HEVC I-Frame Minimum QP Value"; + case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MAX_QP: return "HEVC I-Frame Maximum QP Value"; + case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MIN_QP: return "HEVC P-Frame Minimum QP Value"; + case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MAX_QP: return "HEVC P-Frame Maximum QP Value"; + case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MIN_QP: return "HEVC B-Frame Minimum QP Value"; + case V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MAX_QP: return "HEVC B-Frame Maximum QP Value"; case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE: return "HEVC Profile"; case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL: return "HEVC Level"; case V4L2_CID_MPEG_VIDEO_HEVC_TIER: return "HEVC Tier"; diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h index a184c49..7ba05fe 100644 --- a/include/uapi/linux/v4l2-controls.h +++ b/include/uapi/linux/v4l2-controls.h @@ -578,6 +578,8 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type { #define V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+386) #define V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+387) #define V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+388) +#define V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+389) +#define V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+390) #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) @@ -762,6 +764,13 @@ enum v4l2_cid_mpeg_video_hevc_size_of_length_field { #define V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR (V4L2_CID_MPEG_BASE + 644) #define V4L2_CID_MPEG_VIDEO_CONSTANT_QUALITY (V4L2_CID_MPEG_BASE + 645) #define V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE (V4L2_CID_MPEG_BASE + 646) +#define V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+647) +#define V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+648) +#define V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+649) +#define V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+650) +#define V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+651) +#define V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+652) + enum v4l2_mpeg_video_frame_skip_mode { V4L2_MPEG_VIDEO_FRAME_SKIP_MODE_DISABLED = 0, V4L2_MPEG_VIDEO_FRAME_SKIP_MODE_LEVEL_LIMIT = 1, From patchwork Mon Sep 21 13:04:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dikshita Agarwal X-Patchwork-Id: 11789731 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D07E06CB for ; Mon, 21 Sep 2020 13:04:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BE132218AC for ; Mon, 21 Sep 2020 13:04:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727092AbgIUNEf (ORCPT ); Mon, 21 Sep 2020 09:04:35 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:56138 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726341AbgIUNEe (ORCPT ); Mon, 21 Sep 2020 09:04:34 -0400 Received: from ironmsg08-lv.qualcomm.com ([10.47.202.152]) by alexa-out.qualcomm.com with ESMTP; 21 Sep 2020 06:04:32 -0700 Received: from ironmsg01-blr.qualcomm.com ([10.86.208.130]) by ironmsg08-lv.qualcomm.com with ESMTP/TLS/AES256-SHA; 21 Sep 2020 06:04:30 -0700 Received: from dikshita-linux.qualcomm.com ([10.204.65.237]) by ironmsg01-blr.qualcomm.com with ESMTP; 21 Sep 2020 18:34:30 +0530 Received: by dikshita-linux.qualcomm.com (Postfix, from userid 347544) id 295604DEF; Mon, 21 Sep 2020 18:34:29 +0530 (IST) From: Dikshita Agarwal To: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org Cc: mchehab@kernel.org, hverkuil-cisco@xs4all.nl, ezequiel@collabora.com, stanimir.varbanov@linaro.org, vgarodia@codeaurora.org, majja@codeaurora.org, Dikshita Agarwal Subject: [PATCH v2 2/2] media: v4l2-ctrl: Add layer wise bitrate controls for h264 Date: Mon, 21 Sep 2020 18:34:00 +0530 Message-Id: <1600693440-3015-3-git-send-email-dikshita@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1600693440-3015-1-git-send-email-dikshita@codeaurora.org> References: <1600693440-3015-1-git-send-email-dikshita@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Adds bitrate control for all coding layers for h264 same as hevc. Signed-off-by: Dikshita Agarwal --- .../userspace-api/media/v4l/ext-ctrls-codec.rst | 20 ++++++++++++++++++++ drivers/media/v4l2-core/v4l2-ctrls.c | 7 +++++++ include/uapi/linux/v4l2-controls.h | 8 ++++++++ 3 files changed, 35 insertions(+) diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst index 26f8220..690b066 100644 --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst @@ -1513,6 +1513,26 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type - * - Bit 16:32 - Layer number +``V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L0_BR (integer)`` + Indicates bit rate for hierarchical coding layer 0 for H264 encoder. + +``V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L1_BR (integer)`` + Indicates bit rate for hierarchical coding layer 1 for H264 encoder. + +``V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L2_BR (integer)`` + Indicates bit rate for hierarchical coding layer 2 for H264 encoder. + +``V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L3_BR (integer)`` + Indicates bit rate for hierarchical coding layer 3 for H264 encoder. + +``V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L4_BR (integer)`` + Indicates bit rate for hierarchical coding layer 4 for H264 encoder. + +``V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L5_BR (integer)`` + Indicates bit rate for hierarchical coding layer 5 for H264 encoder. + +``V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L6_BR (integer)`` + Indicates bit rate for hierarchical coding layer 6 for H264 encoder. .. _v4l2-mpeg-h264: diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c index abef73e..9296294 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls.c +++ b/drivers/media/v4l2-core/v4l2-ctrls.c @@ -922,6 +922,13 @@ const char *v4l2_ctrl_get_name(u32 id) case V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP: return "H264 P-Frame Maximum QP Value"; case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MIN_QP: return "H264 B-Frame Minimum QP Value"; case V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MAX_QP: return "H264 B-Frame Maximum QP Value"; + case V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L0_BR: return "H264 Hierarchical Lay 0 BitRate"; + case V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L1_BR: return "H264 Hierarchical Lay 1 BitRate"; + case V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L2_BR: return "H264 Hierarchical Lay 2 BitRate"; + case V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L3_BR: return "H264 Hierarchical Lay 3 BitRate"; + case V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L4_BR: return "H264 Hierarchical Lay 4 BitRate"; + case V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L5_BR: return "H264 Hierarchical Lay 5 BitRate"; + case V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L6_BR: return "H264 Hierarchical Lay 6 BitRate"; case V4L2_CID_MPEG_VIDEO_H264_SPS: return "H264 Sequence Parameter Set"; case V4L2_CID_MPEG_VIDEO_H264_PPS: return "H264 Picture Parameter Set"; case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX: return "H264 Scaling Matrix"; diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h index 7ba05fe..b869b54 100644 --- a/include/uapi/linux/v4l2-controls.h +++ b/include/uapi/linux/v4l2-controls.h @@ -580,12 +580,20 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type { #define V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+388) #define V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MIN_QP (V4L2_CID_MPEG_BASE+389) #define V4L2_CID_MPEG_VIDEO_H264_B_FRAME_MAX_QP (V4L2_CID_MPEG_BASE+390) +#define V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L0_BR (V4L2_CID_MPEG_BASE + 391) +#define V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L1_BR (V4L2_CID_MPEG_BASE + 392) +#define V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L2_BR (V4L2_CID_MPEG_BASE + 393) +#define V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L3_BR (V4L2_CID_MPEG_BASE + 394) +#define V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L4_BR (V4L2_CID_MPEG_BASE + 395) +#define V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L5_BR (V4L2_CID_MPEG_BASE + 396) +#define V4L2_CID_MPEG_VIDEO_H264_HIER_CODING_L6_BR (V4L2_CID_MPEG_BASE + 397) #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) #define V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP (V4L2_CID_MPEG_BASE+403) #define V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP (V4L2_CID_MPEG_BASE+404) #define V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL (V4L2_CID_MPEG_BASE+405) + enum v4l2_mpeg_video_mpeg4_level { V4L2_MPEG_VIDEO_MPEG4_LEVEL_0 = 0, V4L2_MPEG_VIDEO_MPEG4_LEVEL_0B = 1,