cbs_mpeg2.c File Reference

#include "libavutil/avassert.h"
#include "cbs.h"
#include "cbs_internal.h"
#include "cbs_mpeg2.h"
#include "startcode.h"
#include "cbs_mpeg2_syntax_template.c"

Go to the source code of this file.

Macros
#define	HEADER(name)
#define	CHECK(call)
#define	FUNC_NAME(rw, codec, name)   cbs_ ## codec ## _ ## rw ## _ ## name
#define	FUNC_MPEG2(rw, name)   FUNC_NAME(rw, mpeg2, name)
#define	FUNC(name)   FUNC_MPEG2(READWRITE, name)
#define	SUBSCRIPTS(subs, ...)   (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)
#define	ui(width, name)   xui(width, name, current->name, 0, MAX_UINT_BITS(width), 0, )
#define	uir(width, name)   xui(width, name, current->name, 1, MAX_UINT_BITS(width), 0, )
#define	uis(width, name, subs, ...)   xui(width, name, current->name, 0, MAX_UINT_BITS(width), subs, __VA_ARGS__)
#define	uirs(width, name, subs, ...)   xui(width, name, current->name, 1, MAX_UINT_BITS(width), subs, __VA_ARGS__)
#define	xui(width, name, var, range_min, range_max, subs, ...)   xuia(width, #name, var, range_min, range_max, subs, __VA_ARGS__)
#define	sis(width, name, subs, ...)   xsi(width, name, current->name, subs, __VA_ARGS__)
#define	marker_bit()   bit("marker_bit", 1)
#define	bit(string, value)
#define	READ
#define	READWRITE   read
#define	RWContext   GetBitContext
#define	xuia(width, string, var, range_min, range_max, subs, ...)
#define	xsi(width, name, var, subs, ...)
#define	nextbits(width, compare, var)
#define	infer(name, value)
#define	WRITE
#define	READWRITE   write
#define	RWContext   PutBitContext
#define	xuia(width, string, var, range_min, range_max, subs, ...)
#define	xsi(width, name, var, subs, ...)
#define	nextbits(width, compare, var)   (var)
#define	infer(name, value)
#define	START(start_code, type, read_func, free_func)
#define	START(start_code, type, func)

Functions
static int	cbs_mpeg2_split_fragment (CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, int header)
static int	cbs_mpeg2_read_unit (CodedBitstreamContext *ctx, CodedBitstreamUnit *unit)
static int	cbs_mpeg2_write_header (CodedBitstreamContext *ctx, CodedBitstreamUnit *unit, PutBitContext *pbc)
static int	cbs_mpeg2_write_slice (CodedBitstreamContext *ctx, CodedBitstreamUnit *unit, PutBitContext *pbc)
static int	cbs_mpeg2_write_unit (CodedBitstreamContext *ctx, CodedBitstreamUnit *unit, PutBitContext *pbc)
static int	cbs_mpeg2_assemble_fragment (CodedBitstreamContext *ctx, CodedBitstreamFragment *frag)

Variables
static const CodedBitstreamUnitTypeDescriptor	cbs_mpeg2_unit_types []
const CodedBitstreamType	ff_cbs_type_mpeg2

Macro Definition Documentation

HEADER

#define HEADER

(

name

)

Value:

        do { \
        ff_cbs_trace_header(ctx, name); \
    } while (0)

Definition at line 27 of file cbs_mpeg2.c.

CHECK

#define CHECK

(

call

)

Value:

        do { \
        err = (call); \
        if (err < 0) \
            return err; \
    } while (0)

Definition at line 31 of file cbs_mpeg2.c.

FUNC_NAME

#define FUNC_NAME	(		rw,
			codec,
			name
	)		cbs_ ## codec ## _ ## rw ## _ ## name

Definition at line 37 of file cbs_mpeg2.c.

FUNC_MPEG2

#define FUNC_MPEG2	(		rw,
			name
	)		FUNC_NAME(rw, mpeg2, name)

Definition at line 38 of file cbs_mpeg2.c.

FUNC

#define FUNC

(

name

)

FUNC_MPEG2(READWRITE, name)

Definition at line 39 of file cbs_mpeg2.c.

SUBSCRIPTS

#define SUBSCRIPTS	(		subs,
			...
	)		(subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)

Definition at line 41 of file cbs_mpeg2.c.

ui

#define ui	(		width,
			name
	)		xui(width, name, current->name, 0, MAX_UINT_BITS(width), 0, )

Definition at line 43 of file cbs_mpeg2.c.

uir

#define uir	(		width,
			name
	)		xui(width, name, current->name, 1, MAX_UINT_BITS(width), 0, )

Definition at line 45 of file cbs_mpeg2.c.

uis

#define uis	(		width,
			name,
			subs,
			...
	)		xui(width, name, current->name, 0, MAX_UINT_BITS(width), subs, __VA_ARGS__)

Definition at line 47 of file cbs_mpeg2.c.

uirs

#define uirs	(		width,
			name,
			subs,
			...
	)		xui(width, name, current->name, 1, MAX_UINT_BITS(width), subs, __VA_ARGS__)

Definition at line 49 of file cbs_mpeg2.c.

xui

#define xui	(		width,
			name,
			var,
			range_min,
			range_max,
			subs,
			...
	)		xuia(width, #name, var, range_min, range_max, subs, __VA_ARGS__)

Definition at line 51 of file cbs_mpeg2.c.

sis

#define sis	(		width,
			name,
			subs,
			...
	)		xsi(width, name, current->name, subs, __VA_ARGS__)

Definition at line 53 of file cbs_mpeg2.c.

marker_bit

#define marker_bit

(

)

bit("marker_bit", 1)

Definition at line 56 of file cbs_mpeg2.c.

bit

#define bit	(		string,
			value
	)

Value:

        do { \
        av_unused uint32_t bit = value; \
        xuia(1, string, bit, value, value, 0, ); \
    } while (0)

Definition at line 58 of file cbs_mpeg2.c.

READ

#define READ

Definition at line 64 of file cbs_mpeg2.c.

READWRITE [1/2]

#define READWRITE   read

Definition at line 105 of file cbs_mpeg2.c.

RWContext [1/2]

#define RWContext   GetBitContext

Definition at line 106 of file cbs_mpeg2.c.

xuia [1/2]

#define xuia	(		width,
			string,
			var,
			range_min,
			range_max,
			subs,
			...
	)

Value:

        do { \
        uint32_t value; \
        CHECK(ff_cbs_read_unsigned(ctx, rw, width, string, \
                                   SUBSCRIPTS(subs, __VA_ARGS__), \
                                   &value, range_min, range_max)); \
        var = value; \
    } while (0)

Definition at line 108 of file cbs_mpeg2.c.

xsi [1/2]

#define xsi	(		width,
			name,
			var,
			subs,
			...
	)

Value:

        do { \
        int32_t value; \
        CHECK(ff_cbs_read_signed(ctx, rw, width, #name, \
                                 SUBSCRIPTS(subs, __VA_ARGS__), &value, \
                                 MIN_INT_BITS(width), \
                                 MAX_INT_BITS(width))); \
        var = value; \
    } while (0)

Definition at line 114 of file cbs_mpeg2.c.

nextbits [1/2]

#define nextbits	(		width,
			compare,
			var
	)

Value:

    (get_bits_left(rw) >= width && \
     (var = show_bits(rw, width)) == (compare))

Definition at line 121 of file cbs_mpeg2.c.

infer [1/2]

#define infer	(		name,
			value
	)

Value:

        do { \
        current->name = value; \
    } while (0)

Definition at line 123 of file cbs_mpeg2.c.

WRITE

#define WRITE

Definition at line 104 of file cbs_mpeg2.c.

READWRITE [2/2]

#define READWRITE   write

Definition at line 105 of file cbs_mpeg2.c.

RWContext [2/2]

#define RWContext   PutBitContext

Definition at line 106 of file cbs_mpeg2.c.

xuia [2/2]

#define xuia	(		width,
			string,
			var,
			range_min,
			range_max,
			subs,
			...
	)

Value:

        do { \
        CHECK(ff_cbs_write_unsigned(ctx, rw, width, string, \
                                    SUBSCRIPTS(subs, __VA_ARGS__), \
                                    var, range_min, range_max)); \
    } while (0)

Definition at line 108 of file cbs_mpeg2.c.

xsi [2/2]

#define xsi	(		width,
			name,
			var,
			subs,
			...
	)

Value:

        do { \
        CHECK(ff_cbs_write_signed(ctx, rw, width, #name, \
                                  SUBSCRIPTS(subs, __VA_ARGS__), var, \
                                  MIN_INT_BITS(width), \
                                  MAX_INT_BITS(width))); \
    } while (0)

Definition at line 114 of file cbs_mpeg2.c.

nextbits [2/2]

#define nextbits	(		width,
			compare,
			var
	)		(var)

Definition at line 121 of file cbs_mpeg2.c.

infer [2/2]

#define infer	(		name,
			value
	)

Value:

        do { \
        if (current->name != (value)) { \
            av_log(ctx->log_ctx, AV_LOG_WARNING, "Warning: " \
                   "%s does not match inferred value: " \
                   "%"PRId64", but should be %"PRId64".\n", \
                   #name, (int64_t)current->name, (int64_t)(value)); \
        } \
    } while (0)

Definition at line 123 of file cbs_mpeg2.c.

START [1/2]

#define START	(		start_code,
			type,
			read_func,
			free_func
	)

Value:

        case start_code: \
            { \
                type *header = unit->content; \
                err = cbs_mpeg2_read_ ## read_func(ctx, &gbc, header); \
                if (err < 0) \
                    return err; \
            } \
            break;

START [2/2]

#define START	(		start_code,
			type,
			func
	)

Value:

    case start_code: \
        err = cbs_mpeg2_write_ ## func(ctx, pbc, unit->content); \
        break;

Function Documentation

cbs_mpeg2_split_fragment()

static int cbs_mpeg2_split_fragment ( CodedBitstreamContext *  ctx, CodedBitstreamFragment *  frag, int  header  )

static

Definition at line 143 of file cbs_mpeg2.c.

cbs_mpeg2_read_unit()

static int cbs_mpeg2_read_unit ( CodedBitstreamContext *  ctx, CodedBitstreamUnit *  unit  )

static

Definition at line 197 of file cbs_mpeg2.c.

cbs_mpeg2_write_header()

static int cbs_mpeg2_write_header ( CodedBitstreamContext *  ctx, CodedBitstreamUnit *  unit, PutBitContext *  pbc  )

static

Definition at line 265 of file cbs_mpeg2.c.

Referenced by cbs_mpeg2_write_unit().

cbs_mpeg2_write_slice()

static int cbs_mpeg2_write_slice ( CodedBitstreamContext *  ctx, CodedBitstreamUnit *  unit, PutBitContext *  pbc  )

static

Definition at line 293 of file cbs_mpeg2.c.

Referenced by cbs_mpeg2_write_unit().

cbs_mpeg2_write_unit()

static int cbs_mpeg2_write_unit ( CodedBitstreamContext *  ctx, CodedBitstreamUnit *  unit, PutBitContext *  pbc  )

static

Definition at line 342 of file cbs_mpeg2.c.

cbs_mpeg2_assemble_fragment()

static int cbs_mpeg2_assemble_fragment ( CodedBitstreamContext *  ctx, CodedBitstreamFragment *  frag  )

static

Definition at line 352 of file cbs_mpeg2.c.

Variable Documentation

cbs_mpeg2_unit_types

const CodedBitstreamUnitTypeDescriptor cbs_mpeg2_unit_types[]

static

Initial value:

= {
    CBS_UNIT_TYPE_INTERNAL_REF(MPEG2_START_PICTURE, MPEG2RawPictureHeader,
                               extra_information_picture.extra_information),
 
    {
        .nb_unit_types         = CBS_UNIT_TYPE_RANGE,
        .unit_type.range.start = 0x01,
        .unit_type.range.end   = 0xaf,
 
        .content_type   = CBS_CONTENT_TYPE_INTERNAL_REFS,
        .content_size   = sizeof(MPEG2RawSlice),
        .type.ref = { .nb_offsets = 2,
                      .offsets    = { 0x42,
                                      0x42 } },
    },
 
    CBS_UNIT_TYPE_INTERNAL_REF(MPEG2_START_USER_DATA, MPEG2RawUserData,
                               user_data),
 
    CBS_UNIT_TYPE_POD(MPEG2_START_SEQUENCE_HEADER, MPEG2RawSequenceHeader),
    CBS_UNIT_TYPE_POD(MPEG2_START_EXTENSION,       MPEG2RawExtensionData),
    CBS_UNIT_TYPE_POD(MPEG2_START_SEQUENCE_END,    MPEG2RawSequenceEnd),
    CBS_UNIT_TYPE_POD(MPEG2_START_GROUP,           MPEG2RawGroupOfPicturesHeader),
 
    CBS_UNIT_TYPE_END_OF_LIST
}

Definition at line 389 of file cbs_mpeg2.c.

ff_cbs_type_mpeg2

const CodedBitstreamType ff_cbs_type_mpeg2

Initial value:

= {
    .codec_id          = AV_CODEC_ID_MPEG2VIDEO,
 
    .priv_data_size    = sizeof(CodedBitstreamMPEG2Context),
 
    .unit_types        = cbs_mpeg2_unit_types,
 
    .split_fragment    = &cbs_mpeg2_split_fragment,
    .read_unit         = &cbs_mpeg2_read_unit,
    .write_unit        = &cbs_mpeg2_write_unit,
    .assemble_fragment = &cbs_mpeg2_assemble_fragment,
}

Definition at line 416 of file cbs_mpeg2.c.