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h264parse: decode SEI: picture timing info

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Lin YANG 2009-08-17 17:52:47 +08:00 committed by Sebastian Dröge
parent d061c0a0d1
commit dc696c4ffb
1 changed files with 64 additions and 0 deletions
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64
gst/h264parse/gsth264parse.c
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@ -616,6 +616,70 @@ gst_sei_decode_buffering_period (GstH264Parse * h, GstNalBs * bs)
return 0; return 0;
} }
/* decode SEI picture timing message */
static gboolean
gst_sei_decode_picture_timing (GstH264Parse * h, GstNalBs * bs)
{
GstH264Sps *sps = h->sps;
if (sps == NULL) {
GST_WARNING_OBJECT (h, "h->sps=NULL; delayed decoding of picture timing "
"info not implemented yet");
return FALSE;
}
if (sps->nal_hrd_parameters_present_flag
|| sps->vcl_hrd_parameters_present_flag) {
h->sei_cpb_removal_delay =
gst_nal_bs_read (bs, sps->cpb_removal_delay_length_minus1 + 1);
h->sei_dpb_output_delay =
gst_nal_bs_read (bs, sps->dpb_output_delay_length_minus1 + 1);
}
if (sps->pic_struct_present_flag) {
guint i, num_clock_ts;
h->sei_pic_struct = gst_nal_bs_read (bs, 4);
h->sei_ct_type = 0;
if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
return FALSE;
num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
for (i = 0; i < num_clock_ts; i++) {
if (gst_nal_bs_read (bs, 1)) { /* clock_timestamp_flag */
guint full_timestamp_flag;
h->sei_ct_type |= 1 << gst_nal_bs_read (bs, 2);
gst_nal_bs_read (bs, 1); /* nuit_field_based_flag */
gst_nal_bs_read (bs, 5); /* counting_type */
full_timestamp_flag = gst_nal_bs_read (bs, 1);
gst_nal_bs_read (bs, 1); /* discontinuity_flag */
gst_nal_bs_read (bs, 1); /* cnt_dropped_flag */
gst_nal_bs_read (bs, 8); /* n_frames */
if (full_timestamp_flag) {
gst_nal_bs_read (bs, 6); /* seconds_value 0..59 */
gst_nal_bs_read (bs, 6); /* minutes_value 0..59 */
gst_nal_bs_read (bs, 5); /* hours_value 0..23 */
} else {
if (gst_nal_bs_read (bs, 1)) { /* seconds_flag */
gst_nal_bs_read (bs, 6); /* seconds_value range 0..59 */
if (gst_nal_bs_read (bs, 1)) { /* minutes_flag */
gst_nal_bs_read (bs, 6); /* minutes_value 0..59 */
if (gst_nal_bs_read (bs, 1)) /* hours_flag */
gst_nal_bs_read (bs, 5); /* hours_value 0..23 */
}
}
}
if (sps->time_offset_length_minus1 >= 0)
gst_nal_bs_read (bs, sps->time_offset_length_minus1 + 1); /* time_offset */
}
}
GST_DEBUG_OBJECT (h, "ct_type:%X pic_struct:%d\n", h->sei_ct_type,
h->sei_pic_struct);
}
return 0;
}
GST_BOILERPLATE (GstH264Parse, gst_h264_parse, GstElement, GST_TYPE_ELEMENT); GST_BOILERPLATE (GstH264Parse, gst_h264_parse, GstElement, GST_TYPE_ELEMENT);