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/*
* Prototypes for reading AVS elementary streams.
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the MPEG TS, PS and ES tools.
*
* The Initial Developer of the Original Code is Amino Communications Ltd.
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Amino Communications Ltd, Swavesey, Cambridge UK
*
* ***** END LICENSE BLOCK *****
*/
#ifndef _avs_fns
#define _avs_fns
#include "avs_defns.h"
/*
* Return a string representing the start code
*/
extern const char *avs_start_code_str(byte start_code);
/*
* Print out information derived from the start code, to the given stream.
*/
extern void print_avs_start_code_str(FILE *stream,
byte start_code);
/*
* Determine the picture coding type of an AVS ES unit
*
* P/B frames are distinguished by their picture coding types. For I frames,
* we make one up...
*
* Returns an appropriate value (0 if none suitable)
*/
extern int avs_picture_coding_type(ES_unit_p unit);
/*
* Build a new AVS frame reading context.
*
* This acts as a "jacket" around the ES context, and is used when reading
* AVS frames with get_next_avs_frame(). It "remembers" the last
* item read, which is the first item that was not part of the frame.
*
* Returns 0 if it succeeds, 1 if some error occurs.
*/
extern int build_avs_context(ES_p es,
avs_context_p *context);
/*
* Free an AVS frame reading context.
*
* Clears the datastructure, frees it, and returns `context` as NULL.
*
* Does not free any `reverse_data` datastructure.
*
* Does nothing if `context` is already NULL.
*/
extern void free_avs_context(avs_context_p *context);
/*
* Rewind a file being read as AVS frames
*
* This is a wrapper for `seek_ES` that also knows to unset things appropriate
* to the AVS frame reading context.
*
* If a reverse context is attached to this context, it also will
* be "rewound" appropriately.
*
* Returns 0 if all goes well, 1 if something goes wrong.
*/
extern int rewind_avs_context(avs_context_p context);
/*
* Free an AVS "frame".
*
* Clears the datastructure, frees it, and returns `frame` as NULL.
*
* Does nothing if `frame` is already NULL.
*/
extern void free_avs_frame(avs_frame_p *frame);
/*
* Retrieve the the next AVS "frame".
*
* The AVS "frame" returned can be one of:
*
* 1. A frame, including its slices.
* 2. A sequence header, including its sequence extension, if any.
* 3. A sequence end.
*
* Specifically, the next AVS "frame" is retrieved from the input stream.
*
* If that "frame" represents a sequence header or a frame, it is returned.
*
* Note that if the context is associated with a reverse context,
* then appropriate frames/sequence headers will automatically be
* remembered therein.
*
* - `context` is the AVS frame reading context.
* - if `verbose` is true, then extra information will be output
* - if `quiet` is true, then only errors will be reported
* - `frame` is the AVS "frame", containing a frame, a sequence header or a
* sequence end
*
* Returns 0 if it succeeds, EOF if we reach the end of file, or 1 if some
* error occurs.
*/
extern int get_next_avs_frame(avs_context_p context,
int verbose,
int quiet,
avs_frame_p *frame);
/*
* Write out an AVS frame as TS
*
* - `tswriter` is TS the output stream
* - `frame` is the frame to write out
* - `pid` is the PID to use for the TS packets
*
* Returns 0 if it succeeds, 1 if some error occurs.
*/
extern int write_avs_frame_as_TS(TS_writer_p tswriter,
avs_frame_p frame,
uint32_t pid);
/*
* Write out an AVS frame as TS, with PTS timing in the first PES packet
* (and PCR timing in the first TS of the frame).
*
* - `frame` is the frame to write out
* - `tswriter` is the TS context to write with
* - `video_pid` is the PID to use to write the data
* - `got_pts` is TRUE if we have a PTS value, in which case
* - `pts` is said PTS value
* - `got_dts` is TRUE if we also have DTS, in which case
* - `dts` is said DTS value.
*
* If we are given a DTS (which must, by definition, always go up) we will also
* use it as the value for PCR.
*
* Returns 0 if it succeeds, 1 if some error occurs.
*/
extern int write_avs_frame_as_TS_with_pts_dts(avs_frame_p frame,
TS_writer_p tswriter,
uint32_t video_pid,
int got_pts,
uint64_t pts,
int got_dts,
uint64_t dts);
/*
* Write out an AVS frame as TS, with PCR timing in the first TS of the
* frame.
*
* - `frame` is the frame to write out
* - `tswriter` is the TS context to write with
* - `video_pid` is the PID to use to write the data
* - `pcr_base` and `pcr_extn` encode the PCR value.
*
* Returns 0 if it succeeds, 1 if some error occurs.
*/
extern int write_avs_frame_as_TS_with_PCR(avs_frame_p frame,
TS_writer_p tswriter,
uint32_t video_pid,
uint64_t pcr_base,
uint32_t pcr_extn);
/*
* Write out a frame (as stored in an ES unit list) as ES
*
* - `output` is the ES output file
* - `frame` is the frame to write out
*
* Returns 0 if it succeeds, 1 if some error occurs.
*/
extern int write_avs_frame_as_ES(FILE *output,
avs_frame_p frame);
/*
* Report on an AVS frame's contents.
*
* - `stream` is where to write the information
* - `frame` is the frame to report on
* - if `report_data`, then the component ES units will be printed out as well
*/
extern void report_avs_frame(FILE *stream,
avs_frame_p frame,
int report_data);
#endif // _avs_fns
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