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codecparsers: VC1: Implement FrameLayer parsing

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This commit is contained in:
Thibault Saunier 2011-10-05 16:40:47 -03:00
parent fc09e45108
commit 1a1935dacf
2 changed files with 58 additions and 0 deletions
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41
gst-libs/gst/codecparsers/gstvc1parser.c
View file

@ -1617,6 +1617,47 @@ failed:
return GST_VC1_PARSER_ERROR;
}
/**
* gst_vc1_parse_frame_layer:
* @data: The data to parse
* @size: the size of @data
* @framelayer: The #GstVC1FrameLayer to fill.
*
* Parses @data, and fills @framelayer fields.
*
* Returns: a #GstVC1ParserResult
*/
GstVC1ParserResult
gst_vc1_parse_frame_layer (const guint8 * data, gsize size,
GstVC1FrameLayer * framelayer)
{
GstBitReader br = GST_BIT_READER_INIT (data, size);
if (gst_bit_reader_get_remaining (&br) < 64) {
GST_WARNING ("Could not parse frame layer");
return GST_VC1_PARSER_ERROR;
}
/* set default values */
framelayer->skiped_p_frame = 0;
framelayer->key = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
gst_bit_reader_skip_unchecked (&br, 7);
framelayer->framesize = gst_bit_reader_get_bits_uint32_unchecked (&br, 24);
if (framelayer->framesize == 0 || framelayer->framesize == 1)
framelayer->skiped_p_frame = 1;
/* compute next_framelayer_offset */
framelayer->next_framelayer_offset = framelayer->framesize + 8;
framelayer->timestamp = gst_bit_reader_get_bits_uint32_unchecked (&br, 32);
return GST_VC1_PARSER_OK;
}
/**
* gst_vc1_parse_frame_header:
* @data: The data to parse

17
gst-libs/gst/codecparsers/gstvc1parser.h
View file

@ -139,6 +139,7 @@ typedef struct _GstVC1SeqStructB GstVC1SeqStructB;
typedef struct _GstVC1SeqStructC GstVC1SeqStructC;
/* Pictures Structures */
typedef struct _GstVC1FrameLayer GstVC1FrameLayer;
typedef struct _GstVC1FrameHdr GstVC1FrameHdr;
typedef struct _GstVC1PicAdvanced GstVC1PicAdvanced;
typedef struct _GstVC1PicSimpleMain GstVC1PicSimpleMain;
@ -438,6 +439,18 @@ struct _GstVC1VopDquant
};
struct _GstVC1FrameLayer
{
guint8 key;
guint32 framesize;
guint32 timestamp;
/* calculated */
guint32 next_framelayer_offset;
guint8 skiped_p_frame;
};
/**
* GstVC1FrameHdr:
*
@ -521,6 +534,10 @@ gst_vc1_parse_sequence_header_struct_c (const guint8 *data,
gsize size,
GstVC1SeqStructC *structc);
GstVC1ParserResult gst_vc1_parse_frame_layer (const guint8 *data,
gsize size,
GstVC1FrameLayer * framelayer);
GstVC1ParserResult gst_vc1_parse_frame_header (const guint8 *data,
gsize size,
GstVC1FrameHdr * framehdr,