start_page_no_capturepattern()

static int32_t fl::third_party::vorbis::start_page_no_capturepattern ( vorb * f )

static

Definition at line 1172 of file stb_vorbis.cpp.hpp.

{
   uint32 loc0,loc1,n;
   if (f->first_decode && !FL_STBV_IS_PUSH_MODE(f)) {
      f->p_first.page_start = stb_vorbis_get_file_offset(f) - 4;
   }
   // stream structure version
   if (0 != get8(f)) return error(f, VORBIS_invalid_stream_structure_version);
   // header flag
   f->page_flag = get8(f);
   // absolute granule position
   loc0 = get32(f);
   loc1 = get32(f);
   // @TODO: validate loc0,loc1 as valid positions?
   // stream serial number -- vorbis doesn't interleave, so discard
   get32(f);
   //if (f->serial != get32(f)) return error(f, VORBIS_incorrect_stream_serial_number);
   // page sequence number
   n = get32(f);
   f->last_page = n;
   // CRC32
   get32(f);
   // page_segments
   f->segment_count = get8(f);
   if (!getn(f, f->segments, f->segment_count))
      return error(f, VORBIS_unexpected_eof);
   // assume we _don't_ know any the sample position of any segments
   f->end_seg_with_known_loc = -2;
   if (loc0 != ~0U || loc1 != ~0U) {
      int32_t i;
      // determine which packet is the last one that will complete
      for (i=f->segment_count-1; i >= 0; --i)
         if (f->segments[i] < 255)
            break;
      // 'i' is now the index of the _last_ segment of a packet that ends
      if (i >= 0) {
         f->end_seg_with_known_loc = i;
         f->known_loc_for_packet   = loc0;
      }
   }
   if (f->first_decode) {
      int32_t i,len;
      len = 0;
      for (i=0; i < f->segment_count; ++i)
         len += f->segments[i];
      len += 27 + f->segment_count;
      f->p_first.page_end = f->p_first.page_start + len;
      f->p_first.last_decoded_sample = loc0;
   }
   f->next_seg = 0;
   return true;
}

References error(), FL_NOEXCEPT, FL_STBV_IS_PUSH_MODE, get32(), get8(), getn(), stb_vorbis_get_file_offset(), VORBIS_invalid_stream_structure_version, and VORBIS_unexpected_eof.

Referenced by maybe_start_packet(), and start_page().

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