media_dev.h

一个用于智能手机的多媒体库适合S60 WinCE的跨平台开发库

/*
 *			GPAC - Multimedia Framework C SDK
 *
 *			Copyright (c) Jean Le Feuvre 2000-2005 
 *					All rights reserved
 *
 *  This file is part of GPAC / Media Tools sub-project
 *
 *  GPAC 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, or (at your option)
 *  any later version.
 *   
 *  GPAC 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; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *
 */


#ifndef _GF_MEDIA_DEV_H_
#define _GF_MEDIA_DEV_H_

#include <gpac/media_tools.h>

GF_Err gf_import_message(GF_MediaImporter *import, GF_Err e, char *format, ...);

/*returns 0 if not a start code, or size of start code (3 or 4 bytes). If start code, bitstream
is positionned AFTER start code*/
u32 AVC_IsStartCode(GF_BitStream *bs);
/*returns size of chunk between current and next startcode (excluding startcode sizes), 0 if no more startcodes (eos)*/
u32 AVC_NextStartCode(GF_BitStream *bs);
/*returns NAL unit type - bitstream must be sync'ed!!*/
u8 AVC_NALUType(GF_BitStream *bs);
/*slice NALU*/
Bool AVC_NALUIsSlice(u8 type);


typedef struct
{
    s32 profile_idc;
    s32 level_idc;
    s32 prof_compat;
    s32 log2_max_frame_num;
    u32 poc_type, poc_cycle_length;
    s32 log2_max_poc_lsb;
    s32 delta_pic_order_always_zero_flag;
	s32 offset_for_non_ref_pic, offset_for_top_to_bottom_field;
	Bool frame_mbs_only_flag;

    s16 offset_for_ref_frame[256];

    s32 timing_info_present_flag;
    u32 num_units_in_tick;
    u32 time_scale;
    s32 fixed_frame_rate_flag;

	u32 width, height;
	u32 par_num, par_den;
	/*used to discard repeated SPSs - 0: not parsed, 1 parsed, 2 sent*/
	u32 status;
} AVC_SPS;

typedef struct 
{
    s32 sps_id;
    s32 pic_order_present;      /* pic_order_present_flag*/
    s32 redundant_pic_cnt_present; /* redundant_pic_cnt_present_flag */
    int slice_group_count;      /* num_slice_groups_minus1 + 1*/
	/*used to discard repeated SPSs - 0: not parsed, 1 parsed, 2 sent*/
	u32 status;
} AVC_PPS;

typedef struct
{
	u8 nal_ref_idc, nal_unit_type, field_pic_flag, bottom_field_flag;
	u32 frame_num, idr_pic_id, poc_lsb, slice_type;
	s32 delta_poc_bottom;
	s32 delta_poc[2];
	s32 redundant_pic_cnt;

	s32 poc;
	u32 poc_msb, poc_msb_prev, poc_lsb_prev, frame_num_prev;
	s32 frame_num_offset, frame_num_offset_prev;

	AVC_SPS *sps;
	AVC_PPS *pps;
} AVCSliceInfo;


typedef struct 
{
	u32 frame_cnt;
	u8 exact_match_flag;
	u8 broken_link_flag;
	u8 changing_slice_group_idc;
	u8 valid;
} AVCSeiRecoveryPoint;


typedef struct 
{
	AVCSeiRecoveryPoint recovery_point;
	/*to be eventually completed by other sei*/

} AVCSei;

typedef struct
{
	AVC_SPS sps[32];
	AVC_PPS pps[255];

	AVCSliceInfo s_info;
	AVCSei sei;
} AVCState;

/*return sps ID or -1 if error*/
s32 AVC_ReadSeqInfo(GF_BitStream *bs, AVCState *avc, u32 *vui_flag_pos);
/*return pps ID or -1 if error*/
s32 AVC_ReadPictParamSet(GF_BitStream *bs, AVCState *avc);
/*is slice a RAP*/
Bool AVC_SliceIsIDR(AVCState *avc);
/*parses NALU, updates avc state and returns:
	1 if NALU part of new frame
	0 if NALU part of prev frame
	-1 if bitstream error
*/
s32 AVC_ParseNALU(GF_BitStream *bs, u32 nal_hdr, AVCState *avc);
/*remove SEI messages not allowed in MP4*/
u32 AVC_ReformatSEI_NALU(char *buffer, u32 nal_size, AVCState *avc);

GF_Err AVC_ChangePAR(GF_AVCConfig *avcc, s32 ar_n, s32 ar_d);


typedef struct
{
	u8 rate_idx;
	u8 pck_size;
} QCPRateTable;


#endif		/*_GF_MEDIA_DEV_H_*/