mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2025-02-19 20:46:22 +00:00
Code Issues 1 Projects Releases Wiki Activity

codecparsers: jpeg: fix up API

Browse source 
- add data pointer to GstJpegSegment and pass segment
  to all parsing functions, rename accordingly
- shorten GstJpegMarkerCode enum type name to GstJpegMarker
- move function gtk-doc blurbs into .c file
- add since markers
- flesh out docs for SOF markers

https://bugzilla.gnome.org/show_bug.cgi?id=673925
This commit is contained in:
Tim-Philipp Müller 2015-06-20 19:52:42 +01:00
parent 4a85958909
commit 0f04a61bbe
2 changed files with 207 additions and 182 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

211
gst-libs/gst/codecparsers/gstjpegparser.c
View file

@ -1,5 +1,6 @@
/* GStreamer JPEG parser /* GStreamer JPEG parser
* Copyright (C) 2011-2012 Intel Corporation * Copyright (C) 2011-2012 Intel Corporation
* Copyright (C) 2015 Tim-Philipp Müller <tim@centricular.com>
* *
* This library is free software; you can redistribute it and/or * This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License * modify it under the terms of the GNU Lesser General Public License
@ -213,7 +214,7 @@ static gint gst_jpeg_scan_for_marker_code (const guint8 * data, gsize size,
guint offset); guint offset);
static inline gboolean static inline gboolean
jpeg_parse_to_next_marker (GstByteReader * br, guint8 * marker) jpeg_parse_to_next_marker (GstByteReader * br, GstJpegMarker * marker)
{ {
gint ofs; gint ofs;
@ -222,7 +223,8 @@ jpeg_parse_to_next_marker (GstByteReader * br, guint8 * marker)
return FALSE; return FALSE;
if (marker) if (marker)
*marker = br->data[ofs + 1]; *marker = (GstJpegMarker) br->data[ofs + 1];
gst_byte_reader_skip_unchecked (br, ofs - br->byte); gst_byte_reader_skip_unchecked (br, ofs - br->byte);
return TRUE; return TRUE;
} }
@ -258,25 +260,38 @@ gst_jpeg_scan_for_marker_code (const guint8 * data, gsize size, guint offset)
return -1; return -1;
} }
/**
* gst_jpeg_segment_parse_frame_header:
* @segment: the JPEG segment
* @frame_hdr: (out): The #GstJpegFrameHdr structure to fill in
*
* 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.
*
* Returns: TRUE if the frame header was correctly parsed.
*
* Since: 1.6
*/
gboolean gboolean
gst_jpeg_parse_frame_header (GstJpegFrameHdr * frame_hdr, gst_jpeg_segment_parse_frame_header (const GstJpegSegment * segment,
const guint8 * data, gsize size, guint offset) GstJpegFrameHdr * frame_hdr)
{ {
GstByteReader br; GstByteReader br;
guint16 length; guint16 length;
guint8 val; guint8 val;
guint i; guint i;
g_return_val_if_fail (segment != NULL, FALSE);
g_return_val_if_fail (frame_hdr != NULL, FALSE); g_return_val_if_fail (frame_hdr != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (size > offset, FALSE);
size -= offset; if (segment->size < 8)
gst_byte_reader_init (&br, &data[offset], size); return FALSE;
g_return_val_if_fail (size >= 8, FALSE);
U_READ_UINT16 (&br, length); /* Lf */ gst_byte_reader_init (&br, segment->data + segment->offset, segment->size);
g_return_val_if_fail (size >= length, FALSE); length = segment->size;
gst_byte_reader_skip_unchecked (&br, 2);
U_READ_UINT8 (&br, frame_hdr->sample_precision); U_READ_UINT8 (&br, frame_hdr->sample_precision);
U_READ_UINT16 (&br, frame_hdr->height); U_READ_UINT16 (&br, frame_hdr->height);
@ -303,25 +318,36 @@ gst_jpeg_parse_frame_header (GstJpegFrameHdr * frame_hdr,
return TRUE; return TRUE;
} }
/**
* gst_jpeg_segment_parse_scan_header:
* @segment: the JPEG segment
* @scan_hdr: (out): The #GstJpegScanHdr structure to fill in
*
* 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.
*
* Returns: TRUE if the scan header was correctly parsed
*
* Since: 1.6
*/
gboolean gboolean
gst_jpeg_parse_scan_header (GstJpegScanHdr * scan_hdr, gst_jpeg_segment_parse_scan_header (const GstJpegSegment * segment,
const guint8 * data, gsize size, guint offset) GstJpegScanHdr * scan_hdr)
{ {
GstByteReader br; GstByteReader br;
guint16 length; guint16 length;
guint8 val; guint8 val;
guint i; guint i;
g_return_val_if_fail (segment != NULL, FALSE);
g_return_val_if_fail (scan_hdr != NULL, FALSE); g_return_val_if_fail (scan_hdr != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (size > offset, FALSE);
size -= offset; gst_byte_reader_init (&br, segment->data + segment->offset, segment->size);
gst_byte_reader_init (&br, &data[offset], size); length = segment->size;
g_return_val_if_fail (size >= 3, FALSE); g_return_val_if_fail (segment->size >= 3, FALSE);
gst_byte_reader_skip_unchecked (&br, 2);
U_READ_UINT16 (&br, length); /* Ls */
g_return_val_if_fail (size >= length, FALSE);
U_READ_UINT8 (&br, scan_hdr->num_components); U_READ_UINT8 (&br, scan_hdr->num_components);
g_return_val_if_fail (scan_hdr->num_components <= g_return_val_if_fail (scan_hdr->num_components <=
@ -344,9 +370,29 @@ gst_jpeg_parse_scan_header (GstJpegScanHdr * scan_hdr,
return TRUE; return TRUE;
} }
/**
* gst_jpeg_segment_parse_huffman_table:
* @segment: the JPEG segment
* @huff_tables: (out): The #GstJpegHuffmanTable structure to fill in
*
* 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;
*
* Returns: TRUE if the Huffman table was correctly parsed.
*
* Since: 1.6
*/
gboolean gboolean
gst_jpeg_parse_huffman_table (GstJpegHuffmanTables * huf_tables, gst_jpeg_segment_parse_huffman_table (const GstJpegSegment * segment,
const guint8 * data, gsize size, guint offset) GstJpegHuffmanTables * huff_tables)
{ {
GstByteReader br; GstByteReader br;
GstJpegHuffmanTable *huf_table; GstJpegHuffmanTable *huf_table;
@ -355,16 +401,14 @@ gst_jpeg_parse_huffman_table (GstJpegHuffmanTables * huf_tables,
guint32 value_count; guint32 value_count;
guint i; guint i;
g_return_val_if_fail (huf_tables != NULL, FALSE); g_return_val_if_fail (segment != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE); g_return_val_if_fail (huff_tables != NULL, FALSE);
g_return_val_if_fail (size > offset, FALSE);
size -= offset; gst_byte_reader_init (&br, segment->data + segment->offset, segment->size);
gst_byte_reader_init (&br, &data[offset], size); g_return_val_if_fail (segment->size >= 2, FALSE);
g_return_val_if_fail (size >= 2, FALSE);
U_READ_UINT16 (&br, length); /* Lh */ U_READ_UINT16 (&br, length); /* Lh */
g_return_val_if_fail (size >= length, FALSE); g_return_val_if_fail (segment->size >= length, FALSE);
while (gst_byte_reader_get_remaining (&br)) { while (gst_byte_reader_get_remaining (&br)) {
U_READ_UINT8 (&br, val); U_READ_UINT8 (&br, val);
@ -372,9 +416,9 @@ gst_jpeg_parse_huffman_table (GstJpegHuffmanTables * huf_tables,
table_index = (val & 0x0F); table_index = (val & 0x0F);
g_return_val_if_fail (table_index < GST_JPEG_MAX_SCAN_COMPONENTS, FALSE); g_return_val_if_fail (table_index < GST_JPEG_MAX_SCAN_COMPONENTS, FALSE);
if (table_class == 0) { if (table_class == 0) {
huf_table = &huf_tables->dc_tables[table_index]; huf_table = &huff_tables->dc_tables[table_index];
} else { } else {
huf_table = &huf_tables->ac_tables[table_index]; huf_table = &huff_tables->ac_tables[table_index];
} }
READ_BYTES (&br, huf_table->huf_bits, 16); READ_BYTES (&br, huf_table->huf_bits, 16);
value_count = 0; value_count = 0;
@ -389,9 +433,30 @@ failed:
return FALSE; return FALSE;
} }
/**
* gst_jpeg_segment_parse_quantization_table:
* @segment: the JPEG segment
* @quant_tables: (out): The #GstJpegQuantTable structure to fill in
* @num_quant_tables: The number of allocated quantization tables in @quant_tables (FIXME)
*
* 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.
*
* Returns: TRUE if the quantization table was correctly parsed.
*
* Since: 1.6
*/
gboolean gboolean
gst_jpeg_parse_quant_table (GstJpegQuantTables * quant_tables, gst_jpeg_segment_parse_quantization_table (const GstJpegSegment * segment,
const guint8 * data, gsize size, guint offset) GstJpegQuantTables * quant_tables)
{ {
GstByteReader br; GstByteReader br;
GstJpegQuantTable *quant_table; GstJpegQuantTable *quant_table;
@ -399,16 +464,14 @@ gst_jpeg_parse_quant_table (GstJpegQuantTables * quant_tables,
guint8 val, table_index; guint8 val, table_index;
guint i; guint i;
g_return_val_if_fail (segment != NULL, FALSE);
g_return_val_if_fail (quant_tables != NULL, FALSE); g_return_val_if_fail (quant_tables != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (size > offset, FALSE);
size -= offset; gst_byte_reader_init (&br, segment->data + segment->offset, segment->size);
gst_byte_reader_init (&br, &data[offset], size); g_return_val_if_fail (segment->size >= 2, FALSE);
g_return_val_if_fail (size >= 2, FALSE);
U_READ_UINT16 (&br, length); /* Lq */ U_READ_UINT16 (&br, length); /* Lq */
g_return_val_if_fail (size >= length, FALSE); g_return_val_if_fail (segment->size >= length, FALSE);
while (gst_byte_reader_get_remaining (&br)) { while (gst_byte_reader_get_remaining (&br)) {
U_READ_UINT8 (&br, val); U_READ_UINT8 (&br, val);
@ -433,23 +496,33 @@ gst_jpeg_parse_quant_table (GstJpegQuantTables * quant_tables,
return TRUE; return TRUE;
} }
/**
* gst_jpeg_segment_parse_restart_interval:
* @segment: the JPEG segment
* @interval: (out): The parsed restart interval value
*
* The caller must make sure there is enough data for the whole segment
* available.
*
* Returns: TRUE if the restart interval value was correctly parsed.
*
* Since: 1.6
*/
gboolean gboolean
gst_jpeg_parse_restart_interval (guint * interval, gst_jpeg_segment_parse_restart_interval (const GstJpegSegment * segment,
const guint8 * data, gsize size, guint offset) guint * interval)
{ {
GstByteReader br; GstByteReader br;
guint16 length, val; guint16 length, val;
g_return_val_if_fail (segment != NULL, FALSE);
g_return_val_if_fail (interval != NULL, FALSE); g_return_val_if_fail (interval != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
g_return_val_if_fail (size > offset, FALSE);
size -= offset; gst_byte_reader_init (&br, segment->data + segment->offset, segment->size);
gst_byte_reader_init (&br, &data[offset], size); g_return_val_if_fail (segment->size >= 4, FALSE);
g_return_val_if_fail (size >= 4, FALSE);
U_READ_UINT16 (&br, length); /* Lr */ U_READ_UINT16 (&br, length); /* Lr */
g_return_val_if_fail (size >= length, FALSE); g_return_val_if_fail (segment->size >= length, FALSE);
U_READ_UINT16 (&br, val); U_READ_UINT16 (&br, val);
*interval = val; *interval = val;
@ -501,6 +574,15 @@ build_huffman_table (GstJpegHuffmanTable * huf_table,
huf_table->valid = TRUE; huf_table->valid = TRUE;
} }
/**
* gst_jpeg_get_default_huffman_tables:
* @huf_tables: (out): The default DC/AC Huffman tables to fill in
*
* Fills in @huf_tables with the default AC/DC Huffman tables, as
* specified by the JPEG standard.
*
* Since: 1.6
*/
void void
gst_jpeg_get_default_huffman_tables (GstJpegHuffmanTables * huf_tables) gst_jpeg_get_default_huffman_tables (GstJpegHuffmanTables * huf_tables)
{ {
@ -534,6 +616,15 @@ build_quant_table (GstJpegQuantTable * quant_table, const guint8 values[64])
quant_table->valid = TRUE; quant_table->valid = TRUE;
} }
/**
* gst_jpeg_get_default_quantization_table:
* @quant_tables: (out): The default luma/chroma quant-tables in zigzag mode
*
* Fills in @quant_tables with the default quantization tables, as
* specified by the JPEG standard.
*
* Since: 1.6
*/
void void
gst_jpeg_get_default_quantization_tables (GstJpegQuantTables * quant_tables) gst_jpeg_get_default_quantization_tables (GstJpegQuantTables * quant_tables)
{ {
@ -547,14 +638,34 @@ gst_jpeg_get_default_quantization_tables (GstJpegQuantTables * quant_tables)
default_chrominance_quant_table); default_chrominance_quant_table);
} }
/**
* gst_jpeg_parse:
* @segment: (out): pointer to a #GstJpegSegment structure to fill in
* @data: The data to parse
* @size: The size of @data
* @offset: The offset from which to start parsing
*
* 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.
*
* Returns: TRUE if a packet start code was found.
*
* Since: 1.6
*/
gboolean gboolean
gst_jpeg_parse (GstJpegSegment * seg, gst_jpeg_parse (GstJpegSegment * segment,
const guint8 * data, gsize size, guint offset) const guint8 * data, gsize size, guint offset)
{ {
GstJpegSegment *seg = segment;
GstByteReader br; GstByteReader br;
guint16 length; guint16 length;
g_return_val_if_fail (seg != NULL, FALSE); g_return_val_if_fail (seg != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
if (size <= offset) { if (size <= offset) {
GST_DEBUG ("failed to parse from offset %u, buffer is too small", offset); GST_DEBUG ("failed to parse from offset %u, buffer is too small", offset);
@ -617,6 +728,8 @@ gst_jpeg_parse (GstJpegSegment * seg,
seg->size = gst_byte_reader_get_pos (&br) - seg->offset; seg->size = gst_byte_reader_get_pos (&br) - seg->offset;
break; break;
} }
seg->data = data;
return TRUE; return TRUE;
failed: failed:

178
gst-libs/gst/codecparsers/gstjpegparser.h
View file

@ -1,6 +1,6 @@
/* /* GStreamer JPEG parser
* GStreamer JPEG parser
* Copyright (C) 2011-2012 Intel Corporation * Copyright (C) 2011-2012 Intel Corporation
* Copyright (C) 2015 Tim-Philipp Müller <tim@centricular.com>
* *
* This library is free software; you can redistribute it and/or * This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License * modify it under the terms of the GNU Lesser General Public License
@ -62,10 +62,21 @@ typedef struct _GstJpegFrameHdr GstJpegFrameHdr;
typedef struct _GstJpegSegment GstJpegSegment; typedef struct _GstJpegSegment GstJpegSegment;
/** /**
* GstJpegMarkerCode: * GstJpegMarker:
* @GST_JPEG_MARKER_SOF_MIN: Start of frame min marker code * @GST_JPEG_MARKER_SOF0: Start of frame marker code (Baseline)
* @GST_JPEG_MARKER_SOF_MAX: Start of frame max marker code * @GST_JPEG_MARKER_SOF1: Start of frame marker code (Extended Sequential, Huffman)
* @GST_JPEG_MARKER_DHT: Huffman tabler marker code * @GST_JPEG_MARKER_SOF2: Start of frame marker code (Progressive, Huffman)
* @GST_JPEG_MARKER_SOF3: Start of frame marker code (Lossless, Huffman)
* @GST_JPEG_MARKER_SOF5: Start of frame marker code (Differential Sequential, Huffman)
* @GST_JPEG_MARKER_SOF6: Start of frame marker code (Differential Progressive, Huffman)
* @GST_JPEG_MARKER_SOF7: Start of frame marker code (Differential Lossless, Huffman)
* @GST_JPEG_MARKER_SOF9: Start of frame marker code (Extended Sequential, Arithmetic)
* @GST_JPEG_MARKER_SOF10: Start of frame marker code (Progressive, Arithmetic)
* @GST_JPEG_MARKER_SOF11: Start of frame marker code (Lossless, Arithmetic)
* @GST_JPEG_MARKER_SOF13: Start of frame marker code (Differential Sequential, Arithmetic)
* @GST_JPEG_MARKER_SOF14: Start of frame marker code (Differential Progressive, Arithmetic)
* @GST_JPEG_MARKER_SOF15: Start of frame marker code (Differential Lossless, Arithmetic)
* @GST_JPEG_MARKER_DHT: Huffman table marker code
* @GST_JPEG_MARKER_DAC: Arithmetic coding marker code * @GST_JPEG_MARKER_DAC: Arithmetic coding marker code
* @GST_JPEG_MARKER_RST_MIN: Restart interval min marker code * @GST_JPEG_MARKER_RST_MIN: Restart interval min marker code
* @GST_JPEG_MARKER_RST_MAX: Restart interval max marker code * @GST_JPEG_MARKER_RST_MAX: Restart interval max marker code
@ -100,15 +111,15 @@ typedef enum {
GST_JPEG_MARKER_SOF1 = 0xC1, GST_JPEG_MARKER_SOF1 = 0xC1,
GST_JPEG_MARKER_SOF2 = 0xC2, GST_JPEG_MARKER_SOF2 = 0xC2,
GST_JPEG_MARKER_SOF3 = 0xC3, GST_JPEG_MARKER_SOF3 = 0xC3,
GST_JPEG_MARKER_SOF4 = 0xC4, /* 0xC4 = DHT see below */
GST_JPEG_MARKER_SOF5 = 0xC5, GST_JPEG_MARKER_SOF5 = 0xC5,
GST_JPEG_MARKER_SOF6 = 0xC6, GST_JPEG_MARKER_SOF6 = 0xC6,
GST_JPEG_MARKER_SOF7 = 0xC7, GST_JPEG_MARKER_SOF7 = 0xC7,
GST_JPEG_MARKER_SOF8 = 0xC8, /* 0xC8 = reserved */
GST_JPEG_MARKER_SOF9 = 0xC9, GST_JPEG_MARKER_SOF9 = 0xC9,
GST_JPEG_MARKER_SOF10 = 0xCA, GST_JPEG_MARKER_SOF10 = 0xCA,
GST_JPEG_MARKER_SOF11 = 0xCB, GST_JPEG_MARKER_SOF11 = 0xCB,
GST_JPEG_MARKER_SOF12 = 0xCC, /* 0xCC = DAC see below */
GST_JPEG_MARKER_SOF13 = 0xCD, GST_JPEG_MARKER_SOF13 = 0xCD,
GST_JPEG_MARKER_SOF14 = 0xCE, GST_JPEG_MARKER_SOF14 = 0xCE,
GST_JPEG_MARKER_SOF15 = 0xCF, GST_JPEG_MARKER_SOF15 = 0xCF,
@ -145,7 +156,7 @@ typedef enum {
GST_JPEG_MARKER_APP14 = 0xEE, GST_JPEG_MARKER_APP14 = 0xEE,
GST_JPEG_MARKER_APP15 = 0xEF, GST_JPEG_MARKER_APP15 = 0xEF,
GST_JPEG_MARKER_COM = 0xFE, GST_JPEG_MARKER_COM = 0xFE,
} GstJpegMarkerCode; } GstJpegMarker;
#define GST_JPEG_MARKER_SOF_MIN GST_JPEG_MARKER_SOF0 #define GST_JPEG_MARKER_SOF_MIN GST_JPEG_MARKER_SOF0
#define GST_JPEG_MARKER_SOF_MAX GST_JPEG_MARKER_SOF15 #define GST_JPEG_MARKER_SOF_MAX GST_JPEG_MARKER_SOF15
@ -309,146 +320,47 @@ struct _GstJpegFrameHdr
/** /**
* GstJpegSegment: * GstJpegSegment:
* @type: The type of the segment that starts at @offset * @marker: The type of the segment that starts at @offset
* @data: the data containing the jpeg segment starting at @offset
* @offset: The offset to the segment start in bytes. This is the * @offset: The offset to the segment start in bytes. This is the
* exact start of the segment, no marker code included * exact start of the segment, no marker code included
* @size: The size in bytes of the segment, or -1 if the end was not * @size: The size of the segment in bytes, or -1 if the end was not
* found. It is the exact size of the segment, no marker code included * found. It is the exact size of the segment, without the sync byte and
* marker code but including any length bytes.
* *
* A structure that contains the type of a segment, its offset and its size. * A structure that contains the type of a segment, its offset and its size.
*/ */
struct _GstJpegSegment struct _GstJpegSegment
{ {
guint8 marker; GstJpegMarker marker;
const guint8 *data;
guint offset; guint offset;
gint size; gssize size;
}; };
/** gboolean gst_jpeg_parse (GstJpegSegment * seg,
* gst_jpeg_parse: const guint8 * data,
* @seg: (out): pointer to a #GstJpegSegment structure to fill in gsize size,
* @data: The data to parse guint offset);
* @size: The size of @data
* @offset: The offset from which to start parsing
*
* Parses the JPEG bitstream contained in @data, and returns the
* detected segment as a #GstJpegSegment.
*
* Returns: TRUE if a packet start code was found.
*/
gboolean gst_jpeg_parse (GstJpegSegment * seg,
const guint8 * data,
gsize size,
guint offset);
/** gboolean gst_jpeg_segment_parse_frame_header (const GstJpegSegment * segment,
* gst_jpeg_parse_frame_header: GstJpegFrameHdr * frame_hdr);
* @frame_hdr: (out): The #GstJpegFrameHdr structure to fill in
* @data: The data from which to parse the frame header
* @size: The size of @data
* @offset: The offset in bytes from which to start parsing @data
*
* Parses the @frame_hdr JPEG frame header structure members from @data.
*
* Returns: TRUE if the frame header was correctly parsed.
*/
gboolean gst_jpeg_parse_frame_header (GstJpegFrameHdr * frame_hdr,
const guint8 * data,
gsize size,
guint offset);
/** gboolean gst_jpeg_segment_parse_scan_header (const GstJpegSegment * segment,
* gst_jpeg_parse_scan_header: GstJpegScanHdr * scan_hdr);
* @scan_hdr: (out): The #GstJpegScanHdr structure to fill in
* @data: The data from which to parse the scan header
* @size: The size of @data
* @offset: The offset in bytes from which to start parsing @data
*
* Parses the @scan_hdr JPEG scan header structure members from @data.
*
* Returns: TRUE if the scan header was correctly parsed
*/
gboolean gst_jpeg_parse_scan_header (GstJpegScanHdr * scan_hdr,
const guint8 * data,
gsize size,
guint offset);
/** gboolean gst_jpeg_segment_parse_huffman_table (const GstJpegSegment * segment,
* gst_jpeg_parse_quantization_table: GstJpegHuffmanTables * huff_tables);
* @quant_tables: (out): The #GstJpegQuantizationTable structure to fill in
* @num_quant_tables: The number of allocated quantization tables in @quant_tables
* @data: The data from which to parse the quantization table
* @size: The size of @data
* @offset: The offset in bytes from which to start parsing @data
*
* Parses the JPEG quantization table structure members from @data.
*
* 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.
*
* Returns: TRUE if the quantization table was correctly parsed.
*/
gboolean gst_jpeg_parse_quant_table (GstJpegQuantTables *quant_tables,
const guint8 * data,
gsize size,
guint offset);
/** gboolean gst_jpeg_segment_parse_restart_interval (const GstJpegSegment * segment,
* gst_jpeg_parse_huffman_table: guint * interval);
* @huf_tables: (out): The #GstJpegHuffmanTable structure to fill in
* @data: The data from which to parse the Huffman table
* @size: The size of @data
* @offset: The offset in bytes from which to start parsing @data
*
* Parses the JPEG Huffman table structure members from @data.
*
* 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;
*
* Returns: TRUE if the Huffman table was correctly parsed.
*/
gboolean gst_jpeg_parse_huffman_table (GstJpegHuffmanTables *huf_tables,
const guint8 * data,
gsize size,
guint offset);
/** gboolean gst_jpeg_segment_parse_quantization_table (const GstJpegSegment * segment,
* gst_jpeg_parse_restart_interval: GstJpegQuantTables * quant_tables);
* @interval: (out): The parsed restart interval value
* @data: The data from which to parse the restart interval specification
* @size: The size of @data
* @offset: The offset in bytes from which to start parsing @data
*
* Returns: TRUE if the restart interval value was correctly parsed.
*/
gboolean gst_jpeg_parse_restart_interval (guint * interval,
const guint8 * data,
gsize size,
guint offset);
/** void gst_jpeg_get_default_quantization_tables (GstJpegQuantTables * quant_tables);
* gst_jpeg_get_default_huffman_tables:
* @huf_tables: (out): The default DC/AC Huffman tables to fill in
*
* Fills in @huf_tables with the default AC/DC Huffman tables, as
* specified by the JPEG standard.
*/
void gst_jpeg_get_default_huffman_tables (GstJpegHuffmanTables *huf_tables);
/** void gst_jpeg_get_default_huffman_tables (GstJpegHuffmanTables * huff_tables);
* gst_jpeg_get_default_quantization_table:
* @quant_tables: (out): The default luma/chroma quant-tables in zigzag mode
*
* Fills in @quant_tables with the default quantization tables, as
* specified by the JPEG standard.
*/
void gst_jpeg_get_default_quantization_tables (GstJpegQuantTables *quant_tables);
G_END_DECLS G_END_DECLS