h264: some fields in SEIs are longer than 25 bits thus use get_bits_long()

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/h264_sei.c

@@ -47,8 +47,8 @@ void ff_h264_reset_sei(H264Context *h) {
 static int decode_picture_timing(H264Context *h){
     MpegEncContext * const s = &h->s;
     if(h->sps.nal_hrd_parameters_present_flag || h->sps.vcl_hrd_parameters_present_flag){
-        h->sei_cpb_removal_delay = get_bits(&s->gb, h->sps.cpb_removal_delay_length);
-        h->sei_dpb_output_delay = get_bits(&s->gb, h->sps.dpb_output_delay_length);
+        h->sei_cpb_removal_delay = get_bits_long(&s->gb, h->sps.cpb_removal_delay_length);
+        h->sei_dpb_output_delay = get_bits_long(&s->gb, h->sps.dpb_output_delay_length);
     }
     if(h->sps.pic_struct_present_flag){
         unsigned int i, num_clock_ts;
@@ -146,13 +146,13 @@ static int decode_buffering_period(H264Context *h){
     // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
     if (sps->nal_hrd_parameters_present_flag) {
         for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
-            h->initial_cpb_removal_delay[sched_sel_idx] = get_bits(&s->gb, sps->initial_cpb_removal_delay_length);
+            h->initial_cpb_removal_delay[sched_sel_idx] = get_bits_long(&s->gb, sps->initial_cpb_removal_delay_length);
             skip_bits(&s->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
         }
     }
     if (sps->vcl_hrd_parameters_present_flag) {
         for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
-            h->initial_cpb_removal_delay[sched_sel_idx] = get_bits(&s->gb, sps->initial_cpb_removal_delay_length);
+            h->initial_cpb_removal_delay[sched_sel_idx] = get_bits_long(&s->gb, sps->initial_cpb_removal_delay_length);
             skip_bits(&s->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
         }
     }