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h264parse: SPS: decode vui params

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Lin YANG 2009-08-17 17:50:33 +08:00 committed by Sebastian Dröge
parent 2d50657635
commit 90dfda0f46
1 changed files with 98 additions and 0 deletions
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98
gst/h264parse/gsth264parse.c
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@ -357,6 +357,104 @@ gst_vui_decode_hrd_parameters (GstH264Parse * h, GstNalBs * bs)
return TRUE;
}
/* decode vui parameters */
static gboolean
gst_sps_decode_vui (GstH264Parse * h, GstNalBs * bs)
{
GstH264Sps *sps = h->sps;
if (gst_nal_bs_read (bs, 1)) { /* aspect_ratio_info_present_flag */
if (gst_nal_bs_read (bs, 8) == Extended_SAR) { /* aspect_ratio_idc */
gst_nal_bs_read (bs, 16); /* sar_width */
gst_nal_bs_read (bs, 16); /* sar_height */
}
}
if (gst_nal_bs_read (bs, 1)) { /* overscan_info_present_flag */
gst_nal_bs_read (bs, 1); /* overscan_appropriate_flag */
}
if (gst_nal_bs_read (bs, 1)) { /* video_signal_type_present_flag */
gst_nal_bs_read (bs, 3); /* video_format */
gst_nal_bs_read (bs, 1); /* video_full_range_flag */
if (gst_nal_bs_read (bs, 1)) { /* colour_description_present_flag */
gst_nal_bs_read (bs, 8); /* colour_primaries */
gst_nal_bs_read (bs, 8); /* transfer_characteristics */
gst_nal_bs_read (bs, 8); /* matrix_coefficients */
}
}
if (gst_nal_bs_read (bs, 1)) { /* chroma_loc_info_present_flag */
gst_nal_bs_read_ue (bs); /* chroma_sample_loc_type_top_field */
gst_nal_bs_read_ue (bs); /* chroma_sample_loc_type_bottom_field */
}
/*
GST_DEBUG_OBJECT (h,
"aspect_ratio_info_present_flag = %d, "
"overscan_info_present_flag = %d, "
"video_signal_type_present_flag = %d, "
"chroma_loc_info_present_flag = %d\n",
sps->aspect_ratio_info_present_flag, sps->overscan_info_present_flag,
sps->video_signal_type_present_flag, sps->chroma_loc_info_present_flag);
*/
sps->timing_info_present_flag = gst_nal_bs_read (bs, 1);
if (sps->timing_info_present_flag) {
guint32 num_units_in_tick = gst_nal_bs_read (bs, 32);
guint32 time_scale = gst_nal_bs_read (bs, 32);
/* If any of these parameters = 0, discard all timing_info */
if (time_scale == 0) {
GST_WARNING_OBJECT (h,
"time_scale = 0 detected in stream (incompliant to H.264 E.2.1)."
" Discarding related info.");
} else if (num_units_in_tick == 0) {
GST_WARNING_OBJECT (h,
"num_units_in_tick = 0 detected in stream (incompliant to H.264 E.2.1)."
" Discarding related info.");
} else {
sps->num_units_in_tick = num_units_in_tick;
sps->time_scale = time_scale;
sps->fixed_frame_rate_flag = gst_nal_bs_read (bs, 1);
}
GST_DEBUG_OBJECT (h,
"num_units_in_tick = %d, time_scale = %d, "
"fixed_frame_rate_flag = %d\n",
sps->num_units_in_tick, sps->time_scale, sps->fixed_frame_rate_flag);
}
sps->nal_hrd_parameters_present_flag = gst_nal_bs_read (bs, 1);
if (sps->nal_hrd_parameters_present_flag) {
gst_vui_decode_hrd_parameters (h, bs);
}
sps->vcl_hrd_parameters_present_flag = gst_nal_bs_read (bs, 1);
if (sps->vcl_hrd_parameters_present_flag) {
gst_vui_decode_hrd_parameters (h, bs);
}
if (sps->nal_hrd_parameters_present_flag
|| sps->vcl_hrd_parameters_present_flag) {
gst_nal_bs_read (bs, 1); /* low_delay_hrd_flag */
}
sps->pic_struct_present_flag = gst_nal_bs_read (bs, 1);
/* Not going down anymore */
return TRUE;
if (gst_nal_bs_read (bs, 1)) { /* bitstream_restriction_flag */
gst_nal_bs_read (bs, 1); /* motion_vectors_over_pic_boundaries_flag */
gst_nal_bs_read_ue (bs); /* max_bytes_per_pic_denom */
gst_nal_bs_read_ue (bs); /* max_bits_per_mb_denom */
gst_nal_bs_read_ue (bs); /* log2_max_mv_length_horizontal */
gst_nal_bs_read_ue (bs); /* log2_max_mv_length_vertical */
gst_nal_bs_read_ue (bs); /* num_reorder_frames */
gst_nal_bs_read_ue (bs); /* max_dec_frame_buffering */
}
}
GST_BOILERPLATE (GstH264Parse, gst_h264_parse, GstElement, GST_TYPE_ELEMENT);