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/*
* 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 <libucsi/descriptor.h>
#include <libucsi/endianops.h>
/**
* 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
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