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/*
* V4L2 Codec decoding example application
* Kamil Debski <k.debski@samsung.com>
*
* Really simple stream parser header file
*
* Copyright 2012 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef _PARSER_H_
#define _PARSER_H_
/* H264 parser states */
enum h264_parser_state {
H264_PARSER_NO_CODE,
H264_PARSER_CODE_0x1,
H264_PARSER_CODE_0x2,
H264_PARSER_CODE_0x3,
H264_PARSER_CODE_1x1,
H264_PARSER_CODE_SLICE,
};
/* H264 recent tag type */
enum h264_tag_type {
H264_TAG_HEAD,
H264_TAG_SLICE,
};
/* MPEG4 parser states */
enum mpeg4_parser_state {
MPEG4_PARSER_NO_CODE,
MPEG4_PARSER_CODE_0x1,
MPEG4_PARSER_CODE_0x2,
MPEG4_PARSER_CODE_1x1,
};
/* MPEG4 recent tag type */
enum mpeg4_tag_type {
MPEG4_TAG_HEAD,
MPEG4_TAG_VOP,
};
struct input_file {
int fd;
char *data;
int size;
int offs;
};
struct parser_context;
/* Parse the stream:
* - consumed is used to return the number of bytes consumed from the output
* - frame_size is used to return the size of the frame that has been extracted
* - get_head - when equal to 1 it is used to extract the stream header when
* setting up v4l2 decoder
* Return value: 1 - if a complete frame has been extracted, 0 otherwise
*/
typedef int (*parser_func)(struct parser_context *ctx,
char* in, int in_size,
char* out, int out_size,
int *consumed, int *frame_size, int get_head);
/* Parser context */
struct parser_context {
int state;
int last_tag;
char bytes[6];
int main_count;
int headers_count;
int tmp_code_start;
int code_start;
int code_end;
char got_start;
char got_end;
char seek_end;
int short_header;
/* VP8 */
int is_32Bhdr_found;
parser_func func;
struct input_file input;
};
int parser_create(struct parser_context **ctx, const char *url,
unsigned int codec,
unsigned int len, char *data);
void parser_destroy(struct parser_context *ctx);
int parser_read_frame(struct parser_context *ctx, char *data, unsigned int size,
unsigned int *framesize, int stream_header);
#endif /* _PARSER_H_ */
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