static int aac_sync(uint64_t state, AACAC3ParseContext *hdr_info, int *need_next_header, int *new_frame_start) { GetBitContext bits; AACADTSHeaderInfo hdr; int size; union { uint64_t u64; uint8_t u8[8]; } tmp; tmp.u64 = av_be2ne64(state); init_get_bits(&bits, tmp.u8+8-AAC_ADTS_HEADER_SIZE, AAC_ADTS_HEADER_SIZE * 8); if ((size = avpriv_aac_parse_header(&bits, &hdr)) < 0) return 0; *need_next_header = 0; *new_frame_start = 1; hdr_info->sample_rate = hdr.sample_rate; hdr_info->channels = ff_mpeg4audio_channels[hdr.chan_config]; hdr_info->samples = hdr.samples; hdr_info->bit_rate = hdr.bit_rate; return size; }