GstJpegParser

gst_jpeg_get_default_huffman_tables

void 
gst_jpeg_get_default_huffman_tables (GstJpegHuffmanTables * huff_tables)

Fills in huf_tables with the default AC/DC Huffman tables, as specified by the JPEG standard.

Since : 1.6

gst_jpeg_get_default_quantization_tables

void 
gst_jpeg_get_default_quantization_tables (GstJpegQuantTables * quant_tables)

gst_jpeg_parse

gboolean
gst_jpeg_parse (GstJpegSegment * seg,
                guint8 * data,
                gsize size,
                guint offset)

Parses the JPEG bitstream contained in data, and returns the detected segment as a GstJpegSegment.

Note that a valid segment may be returned with a length that exceeds the available data. It is up to the caller to make sure there's enough data available when parsing the segment.

Since : 1.6

gst_jpeg_segment_parse_frame_header

gboolean
gst_jpeg_segment_parse_frame_header (GstJpegSegment * segment,
                                     GstJpegFrameHdr * frame_hdr)

Parses the frame_hdr JPEG frame header structure members from segment.

The caller must make sure there is enough data for the whole segment available.

Since : 1.6

gst_jpeg_segment_parse_huffman_table

gboolean
gst_jpeg_segment_parse_huffman_table (GstJpegSegment * segment,
                                      GstJpegHuffmanTables * huff_tables)

Parses the JPEG Huffman table structure members from segment.

The caller must make sure there is enough data for the whole segment available.

Note: huf_tables represents the complete set of possible Huffman tables. However, the parser will only write to the Huffman table specified by the table destination identifier (Th). While doing so, the valid flag of the specified Huffman table will also be set to TRUE;

Since : 1.6

gst_jpeg_segment_parse_quantization_table

gboolean
gst_jpeg_segment_parse_quantization_table (GstJpegSegment * segment,
                                           GstJpegQuantTables * quant_tables)

Parses the JPEG quantization table structure members from segment.

The caller must make sure there is enough data for the whole segment available.

Note: quant_tables represents the complete set of possible quantization tables. However, the parser will only write to the quantization table specified by the table destination identifier (Tq). While doing so, the valid flag of the specified quantization table will also be set to TRUE.

Since : 1.6

gst_jpeg_segment_parse_restart_interval

gboolean
gst_jpeg_segment_parse_restart_interval (GstJpegSegment * segment,
                                         guint * interval)

The caller must make sure there is enough data for the whole segment available.

Since : 1.6

gst_jpeg_segment_parse_scan_header

gboolean
gst_jpeg_segment_parse_scan_header (GstJpegSegment * segment,
                                    GstJpegScanHdr * scan_hdr)

Parses the scan_hdr JPEG scan header structure members from segment.

The caller must make sure there is enough data for the whole segment available.

Since : 1.6

GstJpegFrameComponent

struct _GstJpegFrameComponent
{
  guint8 identifier;                    /* 0 .. 255     */
  guint8 horizontal_factor;             /* 1 .. 4       */
  guint8 vertical_factor;               /* 1 .. 4       */
  guint8 quant_table_selector;          /* 0 .. 3       */
};

Component-specification parameters.

Since : 1.6

GstJpegFrameHdr

struct _GstJpegFrameHdr
{
  guint8 sample_precision;              /* 2 .. 16      */
  guint16 width;                        /* 1 .. 65535   */
  guint16 height;                       /* 0 .. 65535   */
  guint8 num_components;                /* 1 .. 255     */
  GstJpegFrameComponent components[GST_JPEG_MAX_FRAME_COMPONENTS];
};

Frame header.

Since : 1.6

GstJpegHuffmanTable

struct _GstJpegHuffmanTable
{
  guint8 huf_bits[16];
  guint8 huf_values[256];
  gboolean valid;
};

Huffman table.

Since : 1.6

GstJpegHuffmanTables

struct _GstJpegHuffmanTables
{
  GstJpegHuffmanTable dc_tables[GST_JPEG_MAX_SCAN_COMPONENTS];
  GstJpegHuffmanTable ac_tables[GST_JPEG_MAX_SCAN_COMPONENTS];
};

Helper data structure that holds all AC/DC Huffman tables used to decode an image.

Since : 1.6

GstJpegQuantTable

struct _GstJpegQuantTable
{
  guint8 quant_precision;
  guint16 quant_table[GST_JPEG_MAX_QUANT_ELEMENTS];
  gboolean valid;
};

Quantization table.

Since : 1.6

GstJpegQuantTables

struct _GstJpegQuantTables
{
  GstJpegQuantTable quant_tables[GST_JPEG_MAX_SCAN_COMPONENTS];
};

Helper data structure that holds all quantization tables used to decode an image.

Since : 1.6

GstJpegScanComponent

struct _GstJpegScanComponent
{
    guint8 component_selector;          /* 0 .. 255     */
    guint8 dc_selector;                 /* 0 .. 3       */
    guint8 ac_selector;                 /* 0 .. 3       */
};

Component-specification parameters.

Since : 1.6

GstJpegScanHdr

struct _GstJpegScanHdr
{
  guint8 num_components;                /* 1 .. 4       */
  GstJpegScanComponent components[GST_JPEG_MAX_SCAN_COMPONENTS];

};

Scan header.

Since : 1.6

GstJpegSegment

struct _GstJpegSegment
{
  GstJpegMarker marker;
  const guint8 *data;
  guint offset;
  gssize size;
};

A structure that contains the type of a segment, its offset and its size.

Since : 1.6

GstJpegEntropyCodingMode

typedef enum {
  GST_JPEG_ENTROPY_CODING_HUFFMAN       = 0x00,
  GST_JPEG_ENTROPY_CODING_ARITHMETIC    = 0x08
} GstJpegEntropyCodingMode;

JPEG entropy coding mode.

Since : 1.6

GstJpegMarker

typedef enum {
  GST_JPEG_MARKER_SOF0          = 0xC0,
  GST_JPEG_MARKER_SOF1          = 0xC1,
  GST_JPEG_MARKER_SOF2          = 0xC2,
  GST_JPEG_MARKER_SOF3          = 0xC3,
  /* 0xC4 = DHT see below */
  GST_JPEG_MARKER_SOF5          = 0xC5,
  GST_JPEG_MARKER_SOF6          = 0xC6,
  GST_JPEG_MARKER_SOF7          = 0xC7,
  /* 0xC8 = reserved */
  GST_JPEG_MARKER_SOF9          = 0xC9,
  GST_JPEG_MARKER_SOF10         = 0xCA,
  GST_JPEG_MARKER_SOF11         = 0xCB,
  /* 0xCC = DAC see below */
  GST_JPEG_MARKER_SOF13         = 0xCD,
  GST_JPEG_MARKER_SOF14         = 0xCE,
  GST_JPEG_MARKER_SOF15         = 0xCF,
  GST_JPEG_MARKER_DHT           = 0xC4,
  GST_JPEG_MARKER_DAC           = 0xCC,
  GST_JPEG_MARKER_RST0          = 0xD0,
  GST_JPEG_MARKER_RST1          = 0xD1,
  GST_JPEG_MARKER_RST2          = 0xD2,
  GST_JPEG_MARKER_RST3          = 0xD3,
  GST_JPEG_MARKER_RST4          = 0xD4,
  GST_JPEG_MARKER_RST5          = 0xD5,
  GST_JPEG_MARKER_RST6          = 0xD6,
  GST_JPEG_MARKER_RST7          = 0xD7,
  GST_JPEG_MARKER_SOI           = 0xD8,
  GST_JPEG_MARKER_EOI           = 0xD9,
  GST_JPEG_MARKER_SOS           = 0xDA,
  GST_JPEG_MARKER_DQT           = 0xDB,
  GST_JPEG_MARKER_DNL           = 0xDC,
  GST_JPEG_MARKER_DRI           = 0xDD,
  GST_JPEG_MARKER_APP0          = 0xE0,
  GST_JPEG_MARKER_APP1          = 0xE1,
  GST_JPEG_MARKER_APP2          = 0xE2,
  GST_JPEG_MARKER_APP3          = 0xE3,
  GST_JPEG_MARKER_APP4          = 0xE4,
  GST_JPEG_MARKER_APP5          = 0xE5,
  GST_JPEG_MARKER_APP6          = 0xE6,
  GST_JPEG_MARKER_APP7          = 0xE7,
  GST_JPEG_MARKER_APP8          = 0xE8,
  GST_JPEG_MARKER_APP9          = 0xE9,
  GST_JPEG_MARKER_APP10         = 0xEA,
  GST_JPEG_MARKER_APP11         = 0xEB,
  GST_JPEG_MARKER_APP12         = 0xEC,
  GST_JPEG_MARKER_APP13         = 0xED,
  GST_JPEG_MARKER_APP14         = 0xEE,
  GST_JPEG_MARKER_APP15         = 0xEF,
  GST_JPEG_MARKER_COM           = 0xFE,
} GstJpegMarker;

Indicates the type of JPEG segment.

Since : 1.6

GstJpegProfile

typedef enum {
  GST_JPEG_PROFILE_BASELINE     = 0x00,
  GST_JPEG_PROFILE_EXTENDED     = 0x01,
  GST_JPEG_PROFILE_PROGRESSIVE  = 0x02,
  GST_JPEG_PROFILE_LOSSLESS     = 0x03,
} GstJpegProfile;

JPEG encoding processes.

Since : 1.6