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h264parser: Parse the cropping-rectangle separately.

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Assign the un-cropped width/height to sps->width/sps->height
during sps header parsing. Added new fields to SPS header structure
to provide the crop-rectangle dimensions.

https://bugzilla.gnome.org/show_bug.cgi?id=694068
This commit is contained in:
Sreerenj Balachandran 2013-02-15 14:18:49 +02:00 committed by Sebastian Dröge
parent 1472dd3d58
commit 529ece338f
2 changed files with 23 additions and 10 deletions
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29
gst-libs/gst/codecparsers/gsth264parser.c
View file

@ -1437,7 +1437,6 @@ gst_h264_parse_sps (GstH264NalUnit * nalu, GstH264SPS * sps,
{
NalReader nr;
gint width, height;
guint8 frame_cropping_flag;
guint subwc[] = { 1, 2, 2, 1 };
guint subhc[] = { 1, 2, 1, 1 };
GstH264VUIParams *vui = NULL;
@ -1530,8 +1529,8 @@ gst_h264_parse_sps (GstH264NalUnit * nalu, GstH264SPS * sps,
READ_UINT8 (&nr, sps->mb_adaptive_frame_field_flag, 1);
READ_UINT8 (&nr, sps->direct_8x8_inference_flag, 1);
READ_UINT8 (&nr, frame_cropping_flag, 1);
if (frame_cropping_flag) {
READ_UINT8 (&nr, sps->frame_cropping_flag, 1);
if (sps->frame_cropping_flag) {
READ_UE (&nr, sps->frame_crop_left_offset);
READ_UE (&nr, sps->frame_crop_right_offset);
READ_UE (&nr, sps->frame_crop_top_offset);
@ -1557,19 +1556,31 @@ gst_h264_parse_sps (GstH264NalUnit * nalu, GstH264SPS * sps,
height = (sps->pic_height_in_map_units_minus1 + 1);
height *= 16 * (2 - sps->frame_mbs_only_flag);
GST_LOG ("initial width=%d, height=%d", width, height);
width -= (sps->frame_crop_left_offset + sps->frame_crop_right_offset)
* subwc[sps->chroma_format_idc];
height -= (sps->frame_crop_top_offset + sps->frame_crop_bottom_offset
* subhc[sps->chroma_format_idc] * (2 - sps->frame_mbs_only_flag));
if (width < 0 || height < 0) {
GST_WARNING ("invalid width/height in SPS");
goto error;
}
GST_LOG ("final width=%u, height=%u", width, height);
sps->width = width;
sps->height = height;
if (sps->frame_cropping_flag) {
width -= (sps->frame_crop_left_offset + sps->frame_crop_right_offset)
* subwc[sps->chroma_format_idc];
height -= (sps->frame_crop_top_offset + sps->frame_crop_bottom_offset
* subhc[sps->chroma_format_idc] * (2 - sps->frame_mbs_only_flag));
sps->crop_rect_width = width;
sps->crop_rect_height = height;
sps->crop_rect_x =
sps->frame_crop_left_offset * subwc[sps->chroma_format_idc];
sps->crop_rect_y =
sps->frame_crop_top_offset * subhc[sps->chroma_format_idc] * (2 -
sps->frame_mbs_only_flag);
GST_LOG ("crop_rectangle x=%u y=%u width=%u, height=%u", sps->crop_rect_x,
sps->crop_rect_y, width, height);
}
sps->fps_num = 0;
sps->fps_den = 1;

4
gst-libs/gst/codecparsers/gsth264parser.h
View file

@ -467,12 +467,14 @@ struct _GstH264SPS
guint8 vui_parameters_present_flag;
/* if vui_parameters_present_flag */
GstH264VUIParams vui_parameters;
GstH264VUIParams vui_parameters;
/* calculated values */
guint8 chroma_array_type;
guint32 max_frame_num;
gint width, height;
gint crop_rect_width, crop_rect_height;
gint crop_rect_x, crop_rect_y;
gint fps_num, fps_den;
gboolean valid;
};