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codecparsers: mpeg2: add sequence scalable extension parsing API.

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Add API to parse the Sequence Scalable Extension header.

https://bugzilla.gnome.org/show_bug.cgi?id=664274

Signed-off-by: Sreerenj Balachandran <sreerenj.balachandran@intel.com>
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
This commit is contained in:
Sreerenj Balachandran 2013-01-25 15:48:58 +02:00 committed by Gwenole Beauchesne
parent d10acd3879
commit 2adfbe36f1
2 changed files with 127 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

64
gst-libs/gst/codecparsers/gstmpegvideoparser.c
View file

@ -480,6 +480,70 @@ gst_mpeg_video_packet_parse_sequence_display_extension (const GstMpegVideoPacket
return TRUE;
}
/**
* gst_mpeg_video_packet_parse_sequence_scalable_extension:
* @packet: The #GstMpegVideoPacket that carries the data
* @seqscaleext: (out): The #GstMpegVideoSequenceScalableExt structure to fill
*
* Parses the @seqscaleext MPEG Video Sequence Scalable Extension structure
* members from video @packet
*
* Returns: %TRUE if the seqext could be parsed correctly, %FALSE otherwize.
*
* Since: 1.2
*/
gboolean
gst_mpeg_video_packet_parse_sequence_scalable_extension
(const GstMpegVideoPacket * packet,
GstMpegVideoSequenceScalableExt * seqscaleext) {
GstBitReader br;
g_return_val_if_fail (seqscaleext != NULL, FALSE);
if (packet->size < 5) {
GST_DEBUG ("not enough bytes to parse the extension");
return FALSE;
}
gst_bit_reader_init (&br, &packet->data[packet->offset], packet->size);
if (gst_bit_reader_get_bits_uint8_unchecked (&br, 4) !=
GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE_SCALABLE) {
GST_DEBUG ("Not parsing a sequence scalable extension");
return FALSE;
}
READ_UINT8 (&br, seqscaleext->scalable_mode, 2);
READ_UINT8 (&br, seqscaleext->layer_id, 4);
if (seqscaleext->scalable_mode == GST_MPEG_VIDEO_SEQ_SCALABLE_MODE_SPATIAL) {
READ_UINT16 (&br, seqscaleext->lower_layer_prediction_horizontal_size, 14);
SKIP (&br, 1);
READ_UINT16 (&br, seqscaleext->lower_layer_prediction_vertical_size, 14);
READ_UINT8 (&br, seqscaleext->horizontal_subsampling_factor_m, 5);
READ_UINT8 (&br, seqscaleext->horizontal_subsampling_factor_n, 5);
READ_UINT8 (&br, seqscaleext->vertical_subsampling_factor_m, 5);
READ_UINT8 (&br, seqscaleext->vertical_subsampling_factor_n, 5);
}
if (seqscaleext->scalable_mode == GST_MPEG_VIDEO_SEQ_SCALABLE_MODE_TEMPORAL) {
READ_UINT8 (&br, seqscaleext->picture_mux_enable, 1);
if (seqscaleext->picture_mux_enable)
READ_UINT8 (&br, seqscaleext->mux_to_progressive_sequence, 1);
READ_UINT8 (&br, seqscaleext->picture_mux_order, 3);
READ_UINT8 (&br, seqscaleext->picture_mux_factor, 3);
}
return TRUE;
failed:
GST_WARNING ("error parsing \"Sequence Scalable Extension\"");
return FALSE;
}
gboolean
gst_mpeg_video_finalise_mpeg2_sequence_header (GstMpegVideoSequenceHdr * seqhdr,
GstMpegVideoSequenceExt * seqext,

59
gst-libs/gst/codecparsers/gstmpegvideoparser.h
View file

@ -78,6 +78,7 @@ typedef enum {
* @GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE: Sequence extension code
* @GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE_DISPLAY: Sequence Display extension code
* @GST_MPEG_VIDEO_PACKET_EXT_QUANT_MATRIX: Quantization Matrix extension code
* @GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE_SCALABLE: Sequence Scalable extension code
* @GST_MPEG_VIDEO_PACKET_EXT_PICTURE: Picture coding extension
*
* Indicates what type of packets are in this block, some are mutually
@ -88,9 +89,24 @@ typedef enum {
GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE = 0x01,
GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE_DISPLAY = 0x02,
GST_MPEG_VIDEO_PACKET_EXT_QUANT_MATRIX = 0x03,
GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE_SCALABLE = 0x05,
GST_MPEG_VIDEO_PACKET_EXT_PICTURE = 0x08
} GstMpegVideoPacketExtensionCode;
/**
* GstMpegVideoSequenceScalableMode:
* GST_MPEG_VIDEO_SEQ_SCALABLE_MODE_DATA_PARTITIONING: Data partitioning
* GST_MPEG_VIDEO_SEQ_SCALABLE_MODE_SPATIAL: Spatial Scalability
* GST_MPEG_VIDEO_SEQ_SCALABLE_MODE_SNR: SNR Scalability
* GST_MPEG_VIDEO_SEQ_SCALABLE_MODE_TEMPORAL: Temporal Scalability
*/
typedef enum {
GST_MPEG_VIDEO_SEQ_SCALABLE_MODE_DATA_PARTITIONING = 0x00,
GST_MPEG_VIDEO_SEQ_SCALABLE_MODE_SPATIAL = 0x01,
GST_MPEG_VIDEO_SEQ_SCALABLE_MODE_SNR = 0x02,
GST_MPEG_VIDEO_SEQ_SCALABLE_MODE_TEMPORAL = 0x03
} GstMpegVideoSequenceScalableMode;
/**
* GstMpegVideoLevel:
* @GST_MPEG_VIDEO_LEVEL_LOW: Low level (LL)
@ -176,6 +192,7 @@ typedef enum {
typedef struct _GstMpegVideoSequenceHdr GstMpegVideoSequenceHdr;
typedef struct _GstMpegVideoSequenceExt GstMpegVideoSequenceExt;
typedef struct _GstMpegVideoSequenceDisplayExt GstMpegVideoSequenceDisplayExt;
typedef struct _GstMpegVideoSequenceScalableExt GstMpegVideoSequenceScalableExt;
typedef struct _GstMpegVideoPictureHdr GstMpegVideoPictureHdr;
typedef struct _GstMpegVideoGop GstMpegVideoGop;
typedef struct _GstMpegVideoPictureExt GstMpegVideoPictureExt;
@ -272,6 +289,45 @@ struct _GstMpegVideoSequenceDisplayExt
guint16 display_vertical_size;
};
/**
* GstMpegVideoSequenceScalableExt:
* @scalable_mode:
* @layer_id:
* @lower_layer_prediction_horizontal_size:
* @lower_layer_prediction_vertical_size:
* @horizontal_subsampling_factor_m:
* @horizontal_subsampling_factor_n:
* @vertical_subsampling_factor_m:
* @vertical_subsampling_factor_n:
* @picture_mux_enable:
* @mux_to_progressive_sequence:
* @picture_mux_order:
* @picture_mux_factor:
*
* The Sequence Scalable Extension structure.
*
* Since: 1.2
*/
struct _GstMpegVideoSequenceScalableExt
{
guint8 scalable_mode;
guint8 layer_id;
/* if spatial scalability */
guint16 lower_layer_prediction_horizontal_size;
guint16 lower_layer_prediction_vertical_size;
guint8 horizontal_subsampling_factor_m;
guint8 horizontal_subsampling_factor_n;
guint8 vertical_subsampling_factor_m;
guint8 vertical_subsampling_factor_n;
/* if temporal scalability */
guint8 picture_mux_enable;
guint8 mux_to_progressive_sequence;
guint8 picture_mux_order;
guint8 picture_mux_factor;
};
/**
* GstMpegVideoQuantMatrixExt:
* @load_intra_quantiser_matrix:
@ -411,6 +467,9 @@ gboolean gst_mpeg_video_packet_parse_sequence_extension (const GstMpegVideoPacke
gboolean gst_mpeg_video_packet_parse_sequence_display_extension (const GstMpegVideoPacket * packet,
GstMpegVideoSequenceDisplayExt * seqdisplayext);
gboolean gst_mpeg_video_packet_parse_sequence_scalable_extension (const GstMpegVideoPacket * packet,
GstMpegVideoSequenceScalableExt * seqscaleext);
gboolean gst_mpeg_video_packet_parse_picture_header (const GstMpegVideoPacket * packet,
GstMpegVideoPictureHdr* pichdr);