From ab959d7b4194715870128e616b8e29d4a101e488 Mon Sep 17 00:00:00 2001 From: etobi Date: Tue, 3 Sep 2013 09:48:41 +0200 Subject: Imported Upstream version 1.1.1+rev1207 --- lib/libucsi/mpeg/video_stream_descriptor.h | 101 +++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) create mode 100644 lib/libucsi/mpeg/video_stream_descriptor.h (limited to 'lib/libucsi/mpeg/video_stream_descriptor.h') diff --git a/lib/libucsi/mpeg/video_stream_descriptor.h b/lib/libucsi/mpeg/video_stream_descriptor.h new file mode 100644 index 0000000..14e9196 --- /dev/null +++ b/lib/libucsi/mpeg/video_stream_descriptor.h @@ -0,0 +1,101 @@ +/* + * section and descriptor parser + * + * Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org) + * Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net) + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA + */ + +#ifndef _UCSI_MPEG_VIDEO_STREAM_DESCRIPTOR +#define _UCSI_MPEG_VIDEO_STREAM_DESCRIPTOR 1 + +#ifdef __cplusplus +extern "C" +{ +#endif + +#include +#include + +/** + * The mpeg_video_stream_descriptor structure + */ +struct mpeg_video_stream_descriptor { + struct descriptor d; + + EBIT5(uint8_t multiple_frame_rate_flag : 1; , + uint8_t frame_rate_code : 4; , + uint8_t mpeg_1_only_flag : 1; , + uint8_t constrained_parameter_flag : 1; , + uint8_t still_picture_flag : 1; ); + /* if (mpeg_1_only_flag == 0) struct mpeg_video_stream_extra extra */ +} __ucsi_packed; + +/** + * The mpeg_video_stream_extra - only present in non-MPEG1-only streams. + */ +struct mpeg_video_stream_extra { + uint8_t profile_and_level_indication; + EBIT3(uint8_t chroma_format : 2; , + uint8_t frame_rate_extension : 1; , + uint8_t reserved : 5; ); +} __ucsi_packed; + +/** + * Process an mpeg_video_stream_descriptor structure. + * + * @param d Pointer to the generic descriptor structure. + * @return Pointer to the mpeg_video_stream_descriptor, or NULL on error. + */ +static inline struct mpeg_video_stream_descriptor* + mpeg_video_stream_descriptor_codec(struct descriptor* d) +{ + struct mpeg_video_stream_descriptor* vsd = + (struct mpeg_video_stream_descriptor*) d; + + if (d->len < (sizeof(struct mpeg_video_stream_descriptor) - 2)) + return NULL; + + if (!vsd->mpeg_1_only_flag) { + if (d->len != (sizeof(struct mpeg_video_stream_descriptor) + + sizeof(struct mpeg_video_stream_extra) - 2)) + return NULL; + } + + return (struct mpeg_video_stream_descriptor*) d; +} + +/** + * Get a pointer to the mpeg_video_stream_extra structure. + * + * @param d Pointer to the mpeg_video_stream_descriptor structure. + * @return Pointer to the mpeg_video_stream_extra structure, or NULL on error. + */ +static inline struct mpeg_video_stream_extra* + mpeg_video_stream_descriptor_extra(struct mpeg_video_stream_descriptor* d) +{ + if (d->mpeg_1_only_flag != 0) + return NULL; + + return (struct mpeg_video_stream_extra*) + ((uint8_t*) d + sizeof(struct mpeg_video_stream_descriptor)); +} + +#ifdef __cplusplus +} +#endif + +#endif -- cgit v1.2.3